CN118222105A - Road asphalt composition (variant) and method for producing same - Google Patents

Abstract

The present invention relates to road asphalt compositions (variants) and methods of making road asphalt compositions. According to a first embodiment, a road asphalt composition comprises an oxidized asphalt and tar, wherein the oxidized asphalt is an oxidized product of a mixture of tar and residual products from the hydrocracking of heavy oil residual feedstock. According to a second embodiment, a road asphalt composition comprises the composition according to the first embodiment, a residual product from hydrocracking of a heavy oil residual feedstock, a plasticizer and a styrene-butadiene copolymer. The technical result achievable by the present invention is to provide a road asphalt composition in which the residual products from the hydrocracking of heavy oil residual feedstocks are used and which retains the performance characteristics necessary for its use in road construction and maintenance, including but not limited to the following characteristics, where appropriate: quality change after aging, shear resistance, fatigue resistance and cold resistance.

Description

Road asphalt composition (variant) and method for producing same

The application claims priority to russian patent office, russian patent application No. 2022133435, 12 months 20 of 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to a road asphalt composition, a method for producing the same, and can be useful in road construction and maintenance. Road asphalt compositions have a wide variety of applications including pavement paving, joint sealing, road repair.

Background

In russian federal and worldwide, most road and construction bitumens are produced by oxidizing heavy oil residue feedstocks (i.e., tars).

However, with the inevitable deterioration of the oil quality supplied to refineries and the exhaustion of conventional oil reserves, refineries worldwide have begun to pay more attention to hydrogenation processes that allow tar to be processed into light petroleum products such as naphtha, kerosene, diesel oil, rather than bitumen, thereby improving the overall economic efficiency of processing oil feedstock. Moreover, as a residue of such hydrogenation processes (often referred to as "hydrocracking" for the purposes of the present invention), high viscosity and high boiling point concentrates of asphaltenes and high molecular weight resins may be produced. Such residues are often used to produce fuel oils of poor quality due to their low aggregate stability and the presence of coke and other hydrocarbon saturated products. Because of the lack of research in such hydrocracked residual products, bitumen having quality characteristics meeting regulatory requirements and methods for preparing compositions involving hydrocracked residual products from heavy oil residual feedstocks have been rarely described. Furthermore, the residual products from hydrocracking of heavy oil residues are highly reactive to the oxidative polycondensation process, which ultimately affects the rapid oxidative aging of bitumen produced from such residues.

Due to the cost reduction of residual fuels (fuel oils) by the heavy use of natural gas and the high investment costs for deep conversion of tar into target products (delayed coking, hydrocracking), direct measures have recently been taken to upgrade the vacuum module (vacuum block) of atmospheric and vacuum distillation units, which lead to a resulting tar gain, which involves an increase in the viscosity RV80 of the tar from 70-80s (see patent RU 2476580 published in 2011, 08, 20) to 100-130s, and even to 200s or more.

Meanwhile, except for the currently available standard GOST 33133-2014' public road. Viscous road petroleum asphalt. Technical requirements (Public highways. Visual road petroleum polymers technical requirements) and GOST R52056-2003 "road polymer-asphalt binders based on styrene-butadiene-styrene block copolymers. Beyond specification (Road polymer-bitumen binders based of block copolymers of styrene-butadiene-styrene type.Specifications)", public highways according to GOST 58400.1-2019 "involving PG tags for bitumen products. Petroleum-based asphalt binder. Specifications (Public highways.Petroleum-based bitumen binder.Specifications based on operational temperature range)" based on operating temperature ranges and GOST R58400.2-2019 "public highways. Petroleum-based asphalt binder. Based on the traffic load specification (Public highlight-based bitumen binders. Specifications based on traffic loads) ", new and more stringent requirements for bitumen products are emerging and in effect. A transition has emerged from classification according to the conditional index (penetration, ring-and-ball temperature, flimsy point (Fraas brittle point)) that developed at the beginning of the 20 th century and did not reflect the rheological properties of the binder to classification according to the rheological properties that were physically significant (developed at the end of the 20 th century). Second, in the SHRP Superpave process, which is the basis of the newly accepted GOST standard, the binder aging problem is of great concern, which is critical to modern asphalt under deep oil conversion conditions. It is also very important that the method takes into account the extreme shear strain and load in the initial process steps, as well as the stiffness and creep of the asphalt binder at the end of the oxidation process. This problem was ignored in previous approaches. Third, the method allows the adhesive requirements to be tailored to the climate of the road segment and the traffic conditions on the road segment. This problem has hardly been considered in the previous methods. These standards have been established based on foreign best practices (EU and USA) in the study of binding materials and asphalt concrete under field conditions. The high quality of such products can only be achieved if the requirements of the regulatory documents listed above are complied with.

All these factors pose a difficult task of not only maintaining but even improving the quality of road asphalt.

Patent RU 2721118(C08L95/00、C10C3/04、C10G9/32、C08K3/06、C09D195/00、B01F3/10、B01F5/08、B01F11/02、B01J8/00、B01J19/10,, published on 15 of 05 2020, discloses an invention that is able to process residues from H-Oil hydrogenation processes by mixing the components of the raw material (mixture of heavy Oil-containing residues in a thermally induced mesophase with liquid sulphur), the obtained mixture being heated to a sulphur polymerization temperature and mixed in a medium without external oxidising agents, wherein in order to achieve homogeneity of the mixture during mixing, a receiving and turbulence is created throughout the volume of the material. The technical solution has the disadvantages that:

1) The process is complex with cavitation devices that will be susceptible to erosive wear in the presence of mechanical impurities and solid particles in the feed stream, which is characteristic of suspended bed hydrocracking residues;

2) Liquid sulfur is added to the feed mixture during the preparation of the bitumen, which results in the formation of substantial amounts of gaseous sulfur oxides and hydrogen sulfide that adversely affect the structure and characteristics of the bitumen, such as quality change after aging, shear resistance, and fatigue resistance.

Disclosure of Invention

The technical problem addressed by the present invention is to provide a road asphalt composition comprising residual products from the hydrocracking of heavy oil residual feedstocks and having performance characteristics necessary for use in road construction and maintenance, including the following characteristics where appropriate: quality change after aging, shear resistance, fatigue resistance and cold resistance.

One of the technical effects of the present invention is to provide a road asphalt composition in which the residual product from the hydrocracking of heavy oil residual feedstock is used and which maintains the performance characteristics of the road asphalt composition necessary for use in road construction and maintenance, including but not limited to the following characteristics, where appropriate: quality change after aging, shear resistance, fatigue resistance and cold resistance.

Another technical effect of the present invention is to have the residual products from the hydrocracking of heavy oil residual feedstock participate in the production of a road asphalt composition to provide an energetically favorable and/or less resource demanding process while maintaining the requisite performance characteristics of the road asphalt composition, including but not limited to the following characteristics, where appropriate: quality change after aging, shear resistance, fatigue resistance and cold resistance.

Yet another technical effect of the present invention is to provide the possibility of using the hydrocracked residual product from heavy oil residual feedstock in a road asphalt composition without adversely affecting the characteristics of the composition for use in road construction and maintenance, such as but not limited to quality change after aging, shear resistance, fatigue resistance, cold resistance.

Yet another technical effect of the present invention is the reduction of the environmental impact of the products from the hydrocracking of heavy oil resid feedstock.

One of the technical effects of the present invention is the efficient use of residual products from hydrocracking of heavy oil residual feedstocks in the production of road asphalt compositions.

The technical problem is solved and the technical result is achieved by the road asphalt composition and the method for preparing the road asphalt composition according to the present invention.

The present invention relates to a road asphalt composition comprising an oxidized asphalt and tar, wherein the oxidized asphalt is an oxidized product of a mixture of tar and a residual product from hydrocracking of a heavy oil residual feedstock, wherein:

The amount of the oxidized asphalt is 60wt.% to 75wt.% relative to the total weight of the composition, and the amount of tar is 25wt.% to 40wt.% relative to the total weight of the composition;

The amount of tar in the mixture is 70wt.% to 80wt.% relative to the weight of the mixture, and the amount of the residual product from hydrocracking of the heavy oil residual feedstock in the mixture is 20wt.% to 30wt.% relative to the weight of the mixture.

According to an embodiment, the hydrocracked residual product from the heavy oil residual feedstock is a hydrocracked residual product from tar.

According to an embodiment, the hydrocracked residual product from the heavy oil residual feedstock comprises 8wt.% to 30wt.% asphaltenes.

According to another embodiment, the residual product from hydrocracking of the heavy oil residual feedstock comprises from 25wt.% to 35wt.% of saturated hydrocarbons having from 25 to 130 carbon atoms, preferably from 27 to 127 carbon atoms.

According to an embodiment, the hydrocracked residual product from the heavy oil residual feedstock comprises 25 to 35wt.% of aromatic hydrocarbons having 25 to 130 carbon atoms, preferably 27 to 127 carbon atoms.

According to an embodiment, the composition is intended for road construction and/or maintenance.

The present disclosure also relates to a road asphalt composition comprising:

50 to 63wt.% of the above composition,

30Wt.% to 40wt.% of a residual product from hydrocracking of a heavy oil residual feedstock,

3 To 5wt.% of a plasticizer, and

4 To 5wt.% of a styrene-butadiene copolymer,

Wherein the wt.% is relative to the total weight of the composition.

According to an embodiment, the plasticizer is vacuum gas oil (vacuum gas oil). The vacuum gas oil may be vacuum gas oil from vacuum distillation of straight run fuel oil.

According to an embodiment, the styrene-butadiene copolymer is a linear or branched styrene-butadiene block copolymer. The styrene-butadiene block copolymer may have a molecular weight of 75000 to 85000Da, wherein the styrene-butadiene block copolymer may have a mass fraction of 30wt.% to 35wt.% styrene and a mass fraction of 10wt.% to 20wt.% 1, 2-butadiene units.

The present disclosure also relates to a method of preparing the above road asphalt composition, the method comprising the steps of:

a) Mixing tar and a hydrocracked residual product from a heavy oil residual feedstock in a weight ratio of 2 to 4, preferably 2.3 to 4, to obtain a mixture of tar and the hydrocracked residual product from a heavy oil residual feedstock;

b) Oxidizing the mixture obtained in step a) in an oxidizing device to obtain oxidized asphalt,

C) Mixing the oxidized asphalt and tar obtained in step b) in a weight ratio of the oxidized asphalt to tar of 1.5 to 3 to produce a first asphalt composition,

D) The first bitumen composition is mixed with the plasticizer, the residual product from hydrocracking of the heavy oil residual feedstock, and the styrene-butadiene copolymer to produce a road bitumen composition.

Embodiments of the proposed invention are shown and described more fully in the ensuing description. It will be understood that the invention is capable of other embodiments and that certain details thereof are capable of modifications in various obvious respects, all without departing from the invention as set forth and described in the following claims. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

Drawings

FIG. 1 is a schematic diagram of a block diagram of a process for preparing a road asphalt composition according to the present invention.

Detailed Description

Under present-day conditions, it is important to be able to use refined products, such as products from hydrocracking of heavy oil residue feedstocks, to obtain commercially desirable products of suitable quality. This is equally important from the point of view of energy-efficient processing of heavy oil feedstock, as the processing of the products from hydrocracking of heavy oil residue feedstock is energy-consuming and involves economic costs and expenditures in terms of resource consumption. It can be further noted that not the entire volume of hydrocracked products from heavy oil residuum feedstock can be processed, thus resulting in unavoidable adverse environmental effects.

In accordance with the present disclosure, road asphalt compositions are presented in which the products of hydrocracking from heavy oil residue feedstocks (hereinafter "hydrocracked residues") can be effectively used without significantly affecting the characteristics of the composition, including but not limited to: quality change after aging, shear resistance, fatigue resistance, cold resistance. The prepared road asphalt composition has all the characteristics required by the GOST standard. For example, flash point, dynamic viscosity, shear resistance, mass change after aging, fatigue resistance, cold resistance, related to such characteristics/features of the road asphalt composition.

The road asphalt composition according to the first embodiment comprises an oxidized asphalt and tar, wherein the oxidized asphalt is an oxidized product of a mixture of tar and a residual product from hydrocracking of a heavy oil residual feedstock. According to the invention, the amount of oxidized asphalt is 60wt.% to 75wt.% relative to the total weight of the composition, and the amount of tar is 25wt.% to 40wt.% relative to the total weight of the composition. And, according to the present invention, the amount of tar in the oxidation mixture is 70wt.% to 80wt.% relative to the weight of the mixture, and the amount of the hydrocracking residue in said mixture is 20wt.% to 30wt.% relative to the weight of the mixture.

The inventors of the present invention have found that the use of a hydrocracking residue in a mixture with tar to obtain an oxidized asphalt makes it possible to effectively use the hydrocracking residue in a road asphalt composition (hereinafter referred to as the "composition") without having a considerable impact on the characteristics obtained as described above. The use of tar in addition to oxidized asphalt makes it possible to adjust the characteristics of the composition to achieve the desired characteristics. Said content of hydrocracking residues and tars makes it possible to effectively use the hydrocracking residues to eliminate considerable effects, in particular adverse effects, on the characteristics of the composition.

The hydrocracking residue may be a product from hydrocracking of a heavy oil residue feedstock such as tar. However, the hydrocracked residue may also be a hydrocracked product from other heavy oil residue feedstocks (e.g., fuel oils, heavy gas oils, etc.) having high viscosities. The inventors of the present invention have found that it is most reasonable from the point of view of the characteristics of the resulting composition to use residues from hydrocracking of all tars. However, hydrocracked residues from other oil residue feedstocks may also be used in the present invention. The hydrocracking process is generally not limited and may be represented by a fixed bed catalytic process, a fluidized bed catalytic process, and a slurry catalytic process, for example: wibby combined cracking (Veba Combi Cracker), EST, LC-Fining.

The main quality parameters of tar and residues from its hydrocracking are shown in table 1.

TABLE 1

The hydrocracking residue according to the invention may have various formulations. The hydrocracking residue may comprise 8 to 30wt.%, preferably 8 to 28wt.% asphaltenes, 25 to 35wt.%, preferably 28 to 32wt.% saturated hydrocarbons having 25 to 130 carbon atoms, preferably 27 to 127 carbon atoms, 25 to 35wt.%, preferably 29 to 33wt.% aromatic hydrocarbons having 25 to 130 carbon atoms, preferably 27 to 127 carbon atoms. The inventors of the present invention have found that the use of a hydrocracking residue comprising asphaltenes in the amounts described above has an additional impact on the provision of the possibility to produce a composition having suitable characteristics related to ageing resistance (e.g. oxidative ageing, thermal ageing and combinations thereof) and to the quality change after ageing. The described amounts of saturated and aromatic hydrocarbons also affect the likelihood of effectively using the hydrocracking residue in the composition without adversely affecting the performance/characteristics of the composition.

The road asphalt composition according to the second embodiment comprises the composition according to the first embodiment, hydrocracking residues, a plasticizer and a styrene-butadiene copolymer. The road asphalt composition according to the second embodiment may be a polymer asphalt binder for road construction and/or maintenance.

In addition, the inclusion of the hydrocracking residue in an amount of 30wt.% to 40wt.% relative to the total weight of the composition makes it possible to effectively use the hydrocracking residue to provide a resource-demanding and energy-advantageous process while reducing the impact on the environment. Moreover, the inclusion of hydrocracking residues does not have an adverse effect on the characteristics of the composition.

The inventors of the present invention have found that the use of styrene-butadiene copolymers in the composition, in particular as described below and in an amount of 4 to 5wt.%, relative to the total weight of the composition, makes it possible to effectively use hydrocracking residues. Without wishing to be bound by theory, the inventors contemplate that the styrene-butadiene copolymers incorporated into the composition form their three-dimensional network of structures or "conjugate" structures with the functional groups of the asphaltenes due to the interactions of the polymer molecules, thus creating chemical bonds and thus stabilizing the asphaltenes by preventing coagulation and sedimentation of the asphaltenes. Which allows to relate to a greater amount of hydrocracking residues with a higher asphaltene content than conventional tar-derived asphalts.

The styrene-butadiene copolymer used in the present invention may be a linear or branched styrene-butadiene block copolymer. The copolymer, in particular the styrene-butadiene block copolymer, may have a molecular weight of 75000 to 85000Da, a mass fraction of styrene of 30 to 35wt.% and a mass fraction of 1, 2-butadiene units of 10 to 20 wt.%. The use of such styrene-butadiene copolymers is preferred from the standpoint of the advantages from the use of the copolymer in the composition described above.

The composition according to the invention may comprise a plasticizer in an amount of 3 to 5wt.%, relative to the total weight of the composition, wherein the plasticizer is a vacuum gas oil, in particular a vacuum gas oil from the vacuum distillation of a straight run fuel oil. The inventors further point out that any petroleum product distilled at a boiling point in the range of 350 ℃ -510 ℃ and comprising predominantly aliphatic hydrocarbons having a carbon number of 20 to 50 can be used as a plasticizer. The use of such plasticizers, in particular in the amounts indicated above, makes it possible to adjust the characteristics/features of the composition. In particular, the plasticizer may be useful for improving the dispersibility of the copolymer and for imparting low temperature properties to the composition.

The method of preparing the road asphalt composition according to the second embodiment includes the steps of:

a) Mixing tar and a residual product from hydrocracking of the heavy oil residual feedstock in a tar to residual product weight ratio of from 2 to 4, preferably from 2.3 to 4, to obtain a mixture of tar and a residual product from hydrocracking of the heavy oil residual feedstock;

b) Oxidizing the mixture obtained in step a) in an oxidizing device to obtain oxidized asphalt,

C) Mixing the oxidized asphalt and tar obtained in step b) in a weight ratio of oxidized asphalt to tar of 1.5 to 3 to produce a first asphalt composition, in particular a composition according to a first embodiment,

D) The first bitumen composition is mixed with the plasticizer, the residual product from hydrocracking of the heavy oil residual feedstock, and the styrene-butadiene copolymer to produce a road bitumen composition.

The process for preparing a road asphalt composition according to the present disclosure is schematically shown in fig. 1, wherein all explicitly obvious aspects reflected in fig. 1 are included in the present specification. According to fig. 1, first, the oxidized asphalt is produced by the "diluted-peroxide" technique. The mixture consisting of hydrocracking residues and tar is subjected to oxidation in an oxidation column. In general, tar can be any tar obtained after oil treatment (e.g., after oil treatment including, for example, electrical desalting, dewatering, atmospheric distillation, and vacuum distillation of oil). The oxidation column may represent essentially any column for oxidizing bitumen. Generally, the oxidation tower is a cylindrical vessel adapted to blow crude tar in either vertical or horizontal direction air. Such columns are well known in the art, for example, patent US 3935093a discloses a similar column. The oxidation proceeds to a ring and ball softening point between 70 ° and 75 ℃. The oxidized asphalt is then diluted with the initial tar to a ring and ball softening point of 48 ℃ to 49 ℃ to produce the first asphalt composition. The softening point of the oxidized asphalt may be higher than the claimed ring and ball softening point of 70-75 c, in which case the tar consumption for dilution will be higher. Thereafter, the process is stopped and the first asphalt composition is transported for storage, or the process is continued to obtain the road asphalt composition according to the second embodiment. If the process is continued, the first bitumen composition is mixed with the hydrocracking residue and a plasticiser (e.g. vacuum gas oil) and fed for additional agitation, for example in a mill, for example in a colloid mill. The styrene-butadiene copolymer was then supplied to the mill. Mixing is performed to disperse the polymer in the structure of the mixture/composition. Furthermore, the resulting stream/mixture/composition is directed to a maturation step, as envisaged by the inventors of the present invention, in which step a three-dimensional network of the polymer is formed within 6-8 hours.

In particular, fig. 1 schematically illustrates a process for preparing a road asphalt composition according to the present invention. Line 1 is intended for supplying/transporting tar and a mixture of tar and hydrocarbon residues to an oxidation unit 2 for the production of oxidized bitumen. Line 3 is intended for supplying/transporting the hydrocracking residue via line 1 to an oxidation unit 2 for the production of oxidized bitumen. In general, lines 1, 1', 3', 4', 5, 6,8 shown in fig. 1 may include corresponding transfer piping or any other means of conveying/supplying materials known to those skilled in the art, including tar, mixtures of tar and hydrocracking residues, oxidized asphalt, plasticizers (e.g., vacuum gas oil), styrene-butadiene copolymers, first pass asphalt compositions. The lines 1, 1', 3', 4', 5, 6,8 shown in fig. 1 may also comprise corresponding mixers or any other mixing device known to the person skilled in the art for mixing the above-mentioned components. In line 1, tar and hydrocracking residues are mixed and/or compounded. Tar is fed via line 1 and hydrocracking residue is supplied via line 3 to line 1, wherein tar and hydrocracking residue are mixed in line 1. The tar and the hydrocracking residue may also be suitably mixed in the oxidation unit 2. The tar and hydrocracking residues may be premixed in a corresponding mixing apparatus/device to be supplied to the oxidation unit 2, such as an oxidation tower. In the oxidation unit 2, the mixture of tar and hydrocracking residues from the line 1 is subjected to oxidation to produce oxidized asphalt. The oxidized asphalt from unit 2 is then discharged via line 4. Tar is supplied as a diluent via line 1' to line 4 to dilute the oxidized asphalt from unit 2. The tar and the oxidized asphalt are mixed in line 4 to obtain a first composition or a road asphalt composition according to the first embodiment. The obtained composition can be transported via line 4 for storage for further use. The obtained composition can be supplied via line 4' to a mixing device 7, such as for example a mill, in particular a colloid mill. Plasticizer and styrene-butadiene copolymer are supplied from lines 5 and 6, respectively, to line 4' for subsequent supply of the resulting mixture (e.g., second composition) to mixing apparatus 7. The plasticizer and the styrene-butadiene copolymer may also be supplied directly to the mixing device 7. The first composition, plasticizer and styrene-butadiene copolymer are mixed and/or compounded in a mixing apparatus 7 to produce the road asphalt composition or polymer-asphalt binder composition according to the second embodiment. The obtained composition is then guided via line 8 for storage and/or maturation.

The inventors of the present invention have found that the use of the components in the ratios listed in steps a) and c) makes it possible to effectively use the hydrocracking residues to produce a composition without adversely affecting the characteristics/properties of the composition.

Examples

The hydrocracking residue used in the examples was the residue from hydrocracking tar having the formulation as described in table 2.

TABLE 2

A series of industrial tests have been conducted using the weighted high viscosity tar produced on ELOU-AVT-7 commercial units and the residue from hydrocracking of the tar. ELOU-AVT-7 is a petroleum processing plant in which electrical desalting, dehydration, atmospheric distillation and vacuum distillation of oil are carried out.

Oxidation was performed according to the "peroxide-dilution" technique on a Buturox commercial unit, which was an oxidation column. However, the oxidation process may be performed according to any other technique (e.g., in a hollow oxidation tank, in a thin film). A mixture of tar and residues from its hydrocracking was used as feed for oxidation, wherein the following operating conditions of the oxidation column were maintained:

The feedstock for oxidation was a mixture having the following composition, wt.%:

70.0-80.0% of tar

Residues from hydrocracking of tar 20.0-30.0

Immediately after the reactor, the peroxidized mixture of tar and residues from hydrocracking of tar was diluted with tar supplied to the oxidized mixture in a ratio of 20 to 40%. The compounded tar is then directed to a storage tank for storage at a temperature of 150 ℃ to 180 ℃. Once the storage tank is full, a sample of asphalt is collected for further analysis.

In the mixture of tar and the hydrocracked residual product from the heavy oil residual feedstock, the average content of hydrocracked residues from the heavy oil residual feedstock is 12 to 24wt.%, and the styrene-butadiene block copolymer is introduced into the bitumen product composition so as to increase the content. In addition, plasticizers are used to improve the dispersibility of the polymer and impart low temperature characteristics to the asphalt composition. For the purposes of the present invention, vacuum gas oil obtained from supplied petroleum by vacuum distillation of straight-run fuel oil is used as plasticizer.

Example 1

As a feedstock for oxidation, a mixture consisting of 20wt.% of residues from hydrocracking of tar and 80wt.% of tar was used.

The oxidation is carried out at 242℃under a pressure of 0.12-0.13MPa and an air consumption of 1050-1100kg/h until the softening point of the product of 60-65℃is reached. After the reactor, 25-30wt.% tar, based on the total weight of the composition, is added to the oxidized asphalt. The characteristics of the composition obtained are listed in table 3. The composition fully meets the PG64-28 grade requirements according to GOST 58400.1-2019.

Example 2

As a feedstock for oxidation, a mixture consisting of 20wt.% of residues from hydrocracking of tar and 80wt.% of tar was used.

Oxidation is carried out at 245℃under a pressure of 0.12-0.13MPa and an air consumption of 1150-1200kg/h until a softening point of the product of 55-60℃is reached. After the reactor, 25-30wt.% tar, based on the total weight of the composition, is added to the oxidized asphalt. The characteristics of the composition obtained are listed in table 3. The composition fully meets the PG64-28 grade requirements according to GOST 58400.1-2019.

Example 3

As a feedstock for oxidation, a mixture consisting of 30wt.% of residues from hydrocracking of tar and 70wt.% of tar was used.

Oxidation is carried out at 255℃under a pressure of 0.14-0.15MPa and an air consumption of 2050-2200kg/h until a softening point of the product of 70-75℃is reached. After the reactor, 40wt.% tar, based on the total weight of the composition, was added to the oxidized asphalt. The characteristics of the composition obtained are listed in table 3. The composition fully meets the PG64-28 grade requirements according to GOST 58400.1-2019.

Example 4

The bitumen composition was produced by dispersing a mixture having the following formulation, wt.%:

The dispersion is carried out on a commercial colloid mill at a temperature of 180-185 ℃ after which the mixture is supplied to a maturation tank. After 6 hours, samples were collected and then analyzed. The characteristics of the composition obtained are listed in table 3. The composition fully meets the PG64-34 grade requirements according to GOST 58400.1-2019.

Example 5

The bitumen composition was produced by dispersing a mixture having the following formulation, wt.%:

The dispersion is carried out on a commercial colloid mill at a temperature of 180-185 ℃ after which the mixture is supplied to a maturation tank. After 6 hours, samples were collected and then analyzed. The characteristics of the composition obtained are listed in table 3. The composition fully meets the requirements of PG70-34 grade according to GOST 58400.1-2019 and PG58 (E) -28 grade according to GOST 58400.2-2019.

Example 6

The bitumen composition was produced by dispersing a mixture having the following formulation, wt.%:

The dispersion is carried out on a commercial colloid mill at a temperature of 180-185 ℃ after which the mixture is supplied to a maturation tank. After 6 hours, samples were collected and then analyzed. The characteristics of the composition obtained are listed in table 3. The composition fully meets the PG64-34 grade requirements according to GOST 58400.1-2019.

Example 7

The bitumen composition was produced by dispersing a mixture having the following formulation, wt.%:

The dispersion is carried out on a commercial colloid mill at a temperature of 180-185 ℃ after which the mixture is supplied to a maturation tank. After 6 hours, samples were collected and then analyzed. The characteristics of the composition obtained are listed in table 3. The composition fully meets the PG64-28 grade requirements according to GOST 58400.1-2019.

TABLE 3 Table 3

Claims (12)

1. A road asphalt composition comprising an oxidized asphalt and tar, wherein the oxidized asphalt is an oxidized product of a mixture of tar and residual products from the hydrocracking of heavy oil residual feedstock, wherein:

The amount of the oxidized asphalt is 60wt.% to 75wt.% relative to the total weight of the composition, and the amount of tar is 25wt.% to 40wt.% relative to the total weight of the composition;

The amount of tar in the mixture is 70wt.% to 80wt.% relative to the weight of the mixture, and the amount of the residual product from hydrocracking of the heavy oil residual feedstock in the mixture is 20wt.% to 30wt.% relative to the weight of the mixture.

2. The composition of claim 1, wherein the hydrocracked residual product from a heavy oil residual feedstock is a hydrocracked residual product from tar.

3. The composition of claim 1, wherein the hydrocracked residual product from the heavy oil residual feedstock comprises 8wt.% to 30wt.% asphaltenes.

4. The composition of any of claims 1-3, wherein the residual product from hydrocracking of the heavy oil residual feedstock comprises 25wt.% to 35wt.% saturated hydrocarbons having 25 to 130 carbon atoms, preferably 27 to 127 carbon atoms.

5. The composition of any of claims 1-4, wherein the residual product from hydrocracking of the heavy oil residual feedstock comprises 25wt.% to 35wt.% aromatic hydrocarbons having 25 to 130 carbon atoms, preferably 27 to 127 carbon atoms.

6. Composition according to any one of claims 1-5, wherein the composition is intended for road construction and/or maintenance.

7. A road asphalt composition comprising:

50 to 63wt.% of the composition according to any one of claims 1 to 6,

30Wt.% to 40wt.% of a residual product from hydrocracking of a heavy oil residual feedstock,

3 To 5wt.% of a plasticizer, and

4 To 5wt.% of a styrene-butadiene copolymer,

Wherein the wt.% is relative to the total weight of the composition.

8. The composition according to claim 7, wherein the plasticizer is vacuum gas oil.

9. The composition according to claim 8, wherein the vacuum gas oil is vacuum gas oil from vacuum distillation of straight run fuel oil.

10. The composition according to any one of claims 7-9, wherein the styrene-butadiene copolymer is a linear or branched styrene-butadiene block copolymer.

11. The composition of claim 10, wherein the styrene-butadiene block copolymer has a molecular weight of 75000 to 85000Da, wherein the styrene-butadiene block copolymer can have a mass fraction of 30wt.% to 35wt.% styrene and a mass fraction of 10wt.% to 20wt.% 1, 2-butadiene units.

12. A method of preparing the road asphalt composition of any one of claims 7-11, the method comprising the steps of:

a) Mixing tar and a hydrocracked residual product from a heavy oil residual feedstock in a weight ratio of 2 to 4 to obtain a mixture of tar and the hydrocracked residual product from a heavy oil residual feedstock;

b) Oxidizing the mixture obtained in step a) in an oxidizing device to obtain oxidized asphalt,

C) Mixing the oxidized asphalt and tar obtained in step b) in a weight ratio of the oxidized asphalt to tar of 1.5 to 3 to produce a first asphalt composition,

D) The first bitumen composition is mixed with the plasticizer, the residual product from hydrocracking of the heavy oil residual feedstock, and the styrene-butadiene copolymer to produce a road bitumen composition.