CN108949221A - A kind of magnetism dewaxing agent and magnetic process for dewaxing - Google Patents

Abstract

The invention discloses a magnetic dewaxing agent and a magnetic dewaxing method. The magnetic dewaxing agent includes magnetic nanoparticles and a polymer dewaxing agent coated on the outer periphery of the magnetic nanoparticles; the magnetic nanoparticles include Fe ₃ O ₄ , γ-Fe ₂ O ₃ , Co ₂ O ₃ , NiO or a combination of two or more; the polymer dewaxing agent includes non-polar groups and polar The macromolecular polymer of the group includes homopolymer and copolymer; the molecular weight of the polymer dewaxing agent is between 4,000 and 100,000; the non-polar group includes a long-chain alkyl group, and the polar group Including ester group, ketone group, amino group, amido group, sulfur group. Through the above method, the present invention can simplify the dewaxing process and reduce the cost of dewaxing.

Description

A kind of magnetic dewaxing agent and magnetic dewaxing method

technical field

The invention relates to the technical field of dewaxing, in particular to a magnetic dewaxing agent and a magnetic dewaxing method.

Background technique

Crude oil and refined oil contain a certain amount of wax. These waxes are composed of normal paraffins above C16. As the temperature decreases, these waxes crystallize out and randomly overlap and entangle in the crude oil to form a continuous three-dimensional crystalline network, which makes the crude oil transform from a sol system to a gel system, forming a gel structure with a certain strength, which is It has brought great challenges to the extraction, transportation and use of crude oil.

In the prior art, the separation of wax in crude oil is usually done by adding a dewaxing agent to the crude oil and mixing it evenly, and the wax is precipitated during the cooling process, and the dewaxed crude oil is separated from the precipitated wax and the remaining wax by centrifugation and other methods. Wax separation. This makes the dewaxing process more complicated, and the cost of dewaxing is higher.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

In view of the above deficiencies in the prior art, the object of the present invention is to provide a magnetic dewaxing agent and a magnetic dewaxing method, aiming at solving the problems of complicated dewaxing process and high dewaxing cost in the prior art.

Technical scheme of the present invention is as follows:

A magnetic dewaxing agent, wherein the magnetic dewaxing agent comprises:

Magnetic nanoparticles and a polymer dewaxing agent coated on the periphery of the magnetic nanoparticles;

The magnetic nanoparticles include one or a combination of two or more of Fe ₃ O ₄ , γ-Fe ₂ O ₃ , Co ₂ O ₃ , and NiO;

The polymer dewaxing agent includes polymers with non-polar groups and polar groups in the molecule, including homopolymers and copolymers; the molecular weight of the polymer dewaxing agent is between 4000 and 100000 ; The non-polar group includes a long-chain alkyl group, and the polar group includes an ester group, a ketone group, an amino group, an amido group, and a sulfur group.

Wherein, the particle size of the magnetic nanoparticles is 5-50nm.

Wherein, the magnetic nanoparticles and the polymer dewaxing agent are compounded together by solution blending or melt blending.

Wherein, the polymer dewaxing agent includes polyacrylic high carbon alcohol ester and/or polyethylene-vinyl acetate.

A magnetic dewaxing method, wherein said method comprises:

Provide a preset quality magnetic dewaxing agent, the magnetic dewaxing agent includes magnetic nanoparticles and a polymer dewaxing agent coated on the outer periphery of the magnetic nanoparticles; the magnetic nanoparticles include Fe ₃ O ₄ , γ- One or a combination of two or more of Fe ₂ O ₃ , Co ₂ O ₃ , and NiO; the polymer dewaxing agent includes high molecular polymers with non-polar groups and polar groups in the molecule , including homopolymers and copolymers; the molecular weight of the polymer dewaxing agent is between 4,000 and 100,000; the non-polar groups include long-chain alkyl groups, and the polar groups include ester groups, ketone groups, Amino, amido, sulfur;

Mixing the preset quality magnetic dewaxing agent with the preset quality oil product to be treated to obtain a mixture;

cooling the mixture to a preset temperature or below, so that the wax molecules in the oil to be treated crystallize on the surface of the magnetic dewaxing agent to obtain a magnetic dewaxing agent containing precipitated wax;

A magnetic field is applied to the mixture to precipitate the magnetic dewaxing agent.

Wherein, when the preset mass of oil to be treated is 100g, the preset mass of magnetic dewaxing agent is 5-20mg.

Wherein, the preset temperature is the waxing point of the oil to be treated.

Wherein, before the said mixture is cooled to the preset temperature, it also includes:

The mixture was heated to 50-80° C. and stirred by mechanical stirring for 0.2-1 h.

Wherein, applying a magnetic field to the mixture, after the magnetic dewaxing agent is separated out, also includes:

The mixture is filtered to separate the magnetic dewaxing agent including precipitated wax from the mixture.

Wherein, the magnetic field comes from a permanent magnet or an electromagnet.

Beneficial effects: the magnetic dewaxing agent of the present invention includes magnetic nanoparticles and a polymer dewaxing agent coated on the periphery of the magnetic nanoparticles; the magnetic nanoparticles include Fe ₃ O ₄ , γ-Fe ₂ O ₃ , Co One or a combination of two or more of ₂ O ₃ and NiO. The structure of the polymer dewaxing agent wrapped around the nano-magnetic inner core can make the polymer dewaxing agent better contact with crude oil and improve the dewaxing effect. The magnetic dewaxing agent with magnetism can be separated by an external magnetic field, and the dewaxed crude oil can be separated from the precipitated wax and the remaining dewaxing agent without using separation operations such as centrifugation, which not only simplifies the dewaxing process and It is beneficial to reduce the cost of dewaxing.

Description of drawings

Fig. 1 is the structural representation of a preferred embodiment of a magnetic dewaxing agent of the present invention;

Fig. 2 is a schematic flow diagram of a preferred embodiment of a magnetic dewaxing method of the present invention.

Detailed ways

The present invention provides a magnetic dewaxing agent and a magnetic dewaxing method. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic structural view of a preferred embodiment of a magnetic dewaxing agent of the present invention, which includes magnetic nanoparticles 100 and polymer dewaxing coatings on the outer periphery of the magnetic nanoparticles. Wax agent 200; the magnetic nanoparticles 100 include one or a combination of two or more of Fe ₃ O ₄ , γ-Fe ₂ O ₃ , Co ₂ O ₃ , and NiO; the polymer dewaxing agent 200 includes High molecular polymers with non-polar groups and polar groups in the molecule, including homopolymers and copolymers; the molecular weight of the polymer dewaxing agent 200 is between 4,000 and 100,000; the non-polar group The groups include long-chain alkyl groups, and the polar groups include ester groups, ketone groups, amino groups, amido groups, and sulfur groups.

In this embodiment, the polymer dewaxing agent is wrapped around the outer periphery of the nano-magnetic core, so that the polymer dewaxing agent can better contact with the crude oil and improve the dewaxing effect. The magnetic dewaxing agent with magnetism can be separated by an external magnetic field, and the dewaxed crude oil can be separated from the precipitated wax and the remaining dewaxing agent without using separation operations such as centrifugation, which not only simplifies the dewaxing process and It is beneficial to reduce the cost of dewaxing.

In one embodiment, the magnetic nanoparticles 100 are spherical magnetic nanoparticles. The particle size of the magnetic nanoparticles 100 is 5-50nm, such as 5nm, 10nm, 20nm, 30nm, 40nm or 50nm, and as the particle size of the magnetic nanoparticles 100 decreases, the magnetic nanoparticles 100 The larger the specific surface area. In order to provide a larger accommodation space for the polymer dewaxing agent 200 and ensure that the polymer dewaxing agent 200 can fully stretch to perform the dewaxing effect, the particle diameter of the magnetic nanoparticles 100 is 30 nm.

In one embodiment, the magnetic nanoparticles 100 and the polymer dewaxing agent 200 are composited together by solution blending or melt blending. The polymer dewaxing agent 200 can be coated on the outer periphery of the magnetic nanoparticles 100 by solution blending or melt blending, so as to obtain the magnetic dewaxing agent. In order to reduce the use of solvents and achieve a stronger interaction between the magnetic nanoparticles 100 and the polymer dewaxing agent 200, the magnetic nanoparticles 100 and the polymer dewaxing agent 200 are melt-blended Composite together.

In one embodiment, the polymeric dewaxing agent comprises polyacrylic acid higher alcohol ester and/or polyethylene-vinyl acetate. Using polyacrylic high carbon alcohol ester and/or polyethylene-vinyl acetate as the polymer dewaxing agent can closely cooperate with the magnetic nanoparticles, avoiding the polymerization in the magnetic dewaxing agent during use The dewaxing agent is separated from the magnetic nanoparticles. In order to obtain a better dewaxing effect, the polymer dewaxing agent is a mixture of polyacrylic high carbon alcohol ester and polyethylene-vinyl acetate. Of course, according to the characteristics of the crude oil to be dewaxed, different polymer dewaxing agents or combinations of polymer dewaxing agents can be selected.

In order to solve the above technical problems, the present invention also provides a magnetic dewaxing method.

Please refer to Fig. 2, Fig. 2 is a schematic flow diagram of a preferred embodiment of a magnetic dewaxing method of the present invention, the method includes steps:

S100, provide preset quality magnetic dewaxing agent.

In the step S100, the magnetic dewaxing agent includes magnetic nanoparticles and a polymer dewaxing agent coated on the outer periphery of the magnetic nanoparticles; the magnetic nanoparticles include Fe ₃ O ₄ , γ-Fe ₂ O _3. One or a combination of two or more of Co ₂ O ₃ and NiO; the polymer dewaxing agent includes high molecular polymers with non-polar groups and polar groups in the molecule, including homogeneous Polymers and copolymers; the molecular weight of the polymer dewaxing agent is between 4,000 and 100,000; the non-polar groups include long-chain alkyl groups, and the polar groups include ester groups, ketone groups, amino groups, and amides base, sulfur base.

Due to the structure of the polymer dewaxing agent wrapped around the nano-magnetic inner core, the polymer dewaxing agent can better contact the crude oil and improve the dewaxing effect. The magnetic dewaxing agent with magnetism can be separated by an external magnetic field, and the dewaxed crude oil can be separated from the precipitated wax and the remaining dewaxing agent without using separation operations such as centrifugation, which not only simplifies the dewaxing process and It is beneficial to reduce the cost of dewaxing.

Further, the magnetic nanoparticles are spherical magnetic nanoparticles. The particle diameter of the magnetic nanoparticles 100 is 5-50nm, such as 5nm, 10nm, 20nm, 30nm, 40nm or 50nm, and as the particle diameter of the magnetic nanoparticles decreases, the magnetic nanoparticles per unit mass The larger the specific surface area. In order to provide the polymer dewaxing agent with a larger accommodating space and ensure that the polymer dewaxing agent can be fully stretched to perform the dewaxing effect, the particle diameter of the magnetic nanoparticles is 30 nm.

Further, the magnetic nanoparticles and the polymer dewaxing agent are compounded together by solution blending or melt blending. The polymer dewaxing agent can be coated on the outer periphery of the magnetic nanoparticles by solution blending or melt blending, thereby obtaining the magnetic dewaxing agent. In order to reduce the use of solvent, the magnetic nanoparticles and the polymer dewaxing agent are compounded together by melt blending.

Furthermore, the polymer dewaxing agent includes polyacrylic high carbon alcohol ester and/or polyethylene-vinyl acetate. Using polyacrylic high carbon alcohol ester and/or polyethylene-vinyl acetate as the polymer dewaxing agent can closely cooperate with the magnetic nanoparticles, avoiding the polymerization in the magnetic dewaxing agent during use The dewaxing agent is separated from the magnetic nanoparticles. In order to obtain a better dewaxing effect, the polymer dewaxing agent is a mixture of polyacrylic high carbon alcohol ester and polyethylene-vinyl acetate. Of course, according to the characteristics of the crude oil to be dewaxed, different polymer dewaxing agents or combinations of polymer dewaxing agents can be selected.

S200. Mix the preset mass of magnetic dewaxing agent with the preset mass of oil to be treated to obtain a mixture.

In the step S200, the predetermined mass of magnetic dewaxing agent is mixed with the predetermined mass of oil to be treated by means of mechanical stirring or magnetic stirring to obtain a mixture. Further, when the preset quality of the oil to be treated is 100g, the preset quality of the magnetic dewaxing agent is 5-20mg, that is, the ratio of the magnetic dewaxing agent to the oil to be treated is The mass ratio is 50-200 mg/Kg, such as 50 mg/Kg, 100 mg/Kg, 150 mg/Kg or 200 mg/Kg. Since the polymer dewaxing agent is coated on the outer periphery of the magnetic nanoparticles, the magnetic dewaxing agent can better mix with the oil to be treated and exert a dewaxing effect, and treat the same quality of the untreated oil For oil products, the amount of the polymer dewaxing agent contained in the magnetic dewaxing agent is less than the amount when the polymer dewaxing agent is used alone, which is beneficial to reduce the cost of dewaxing.

S300, cooling the mixture to a preset temperature or below, so that the wax in the oil to be treated is generated on the surface of the magnetic dewaxing agent to obtain a magnetic dewaxing agent including precipitated wax.

In the step S300, under the condition of continuous stirring, the temperature of the mixture is lowered to below the preset temperature, so that the wax in the oil to be treated is generated on the surface of the magnetic dewaxing agent. In one embodiment, the preset temperature may be 0-18°C, such as 0°C, 5°C, 10°C, 15°C or 18°C, etc. Lowering the temperature is beneficial to the precipitation of wax. And for different types of oil products to be treated, such as oil products to be treated with different formation environments or oil products to be treated with different compositions such as water content, the precipitation of wax is different under the same temperature. Therefore, in order to obtain better The dewaxing effect, the preset temperature is the waxing point of the oil to be treated. Lowering the temperature of the mixture to or below the waxing point of the corresponding oil to be treated can quickly and efficiently remove the wax in the oil to be treated.

S400, applying a magnetic field to the mixture to precipitate the magnetic dewaxing agent.

In the step S400, since the magnetic dewaxing agent has a magnetic inner core, the magnetic dewaxing agent can be separated from the oil to be treated by applying a magnetic field. Of course, at least part of the separated magnetic dewaxing agent is the magnetic dewaxing agent including the precipitated wax. Further, the magnetic field comes from a permanent magnet or an electromagnet. In order to reduce the production cost and simplify the process, the magnetic field comes from a permanent magnet.

Further, due to the effect of the magnetic field, the magnetic dewaxing agent cannot flow out with the flow of the liquid, and the dewaxed oil to be treated can be separated from the magnetic dewaxing agent by simple pouring. In order to obtain higher separation efficiency, after applying a magnetic field to the mixture to precipitate the magnetic dewaxing agent, the method further includes: filtering the mixture, and separating the magnetic dewaxing agent including the precipitated wax from the mixture.

In another embodiment, before cooling the mixture to a preset temperature, it further includes: heating the mixture to 50-80° C., and stirring for 0.2-1 h by means of mechanical stirring. The method of stirring and heating is beneficial to the thorough mixing of the magnetic dewaxing agent and the oil to be treated, and the full removal of wax in the oil to be treated.

The technical solution of the present invention is further described below in conjunction with the examples. In the following implementation, the treatment method is mechanical stirring. After cooling down to the wax precipitation point, after the quality of the precipitated wax no longer increases, the precipitated wax is separated according to the above method. Calculate the dewaxing rate, which is the ratio of the mass of the precipitated wax to the measured wax content of the crude oil.

Table 1 uses 200mg dewaxing agent to carry out the comparison table of the effect of dewaxing 1Kg Shengli crude oil

It can be seen from Table 1 that under the same type and amount of dewaxing agent, the magnetic dewaxing method can improve the dewaxing rate. That is to say, to achieve the same dewaxing rate, the use of magnetic dewaxing can reduce the amount of dewaxing agent, which is beneficial to reduce the point cost.

Table 2 adopts 200mg dewaxing agent to carry out the comparison table of the effect of dewaxing 1Kg Tarim crude oil

Comparing Table 1 and Table 2, it can be seen that when the amount of polymer dewaxing agent is the same, the combination of different dewaxing agents can further improve the dewaxing effect. That is, for the same crude oil to be treated, selecting the corresponding dewaxing agent can further improve the dewaxing effect.

Table 3 uses 100mg dewaxing agent to carry out the comparison table of the effect of dewaxing 1Kg Shengli crude oil

Comparing Table 1 and Table 3, it can be seen that increasing the amount of dewaxing agent is beneficial to improve the dewaxing rate when treating the same quality crude oil to be treated.

Table 4 adopts 100mg dewaxing agent to carry out the comparison table of the effect of dewaxing 1Kg Tarim crude oil

Similarly, comparing Table 2 and Table 4, it can be seen that increasing the amount of dewaxing agent is beneficial to the improvement of dewaxing rate when treating the crude oil to be treated with the same quality.

Through the comparison of the above examples, it can be seen that compared with using the dewaxing agent alone, the magnetic dewaxing agent of the present invention can effectively increase the dewaxing rate, which is beneficial to further reduce the dewaxing cost.

In summary, the present invention discloses a magnetic dewaxing agent and a magnetic dewaxing method. The magnetic dewaxing agent includes magnetic nanoparticles and a polymer dewaxing agent coated on the outer periphery of the magnetic nanoparticles; The magnetic nanoparticles include one or a combination of two or more of Fe ₃ O ₄ , γ-Fe ₂ O ₃ , Co ₂ O ₃ , and NiO; the polymer dewaxing agent includes a non-polar The macromolecular polymers of groups and polar groups, including homopolymers and copolymers; the molecular weight of the polymer dewaxing agent is between 4,000 and 100,000; the non-polar groups include long-chain alkyl groups, so The polar groups include ester groups, ketone groups, amino groups, amido groups, and thio groups. Through the above method, the present invention can simplify the dewaxing process and reduce the cost of dewaxing.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (10)

1. A magnetic dewaxing agent, characterized in that, said magnetic dewaxing agent comprises: Magnetic nanoparticles and a polymer dewaxing agent coated on the periphery of the magnetic nanoparticles; The magnetic nanoparticles include one or a combination of two or more of Fe ₃ O ₄ , γ-Fe ₂ O ₃ , Co ₂ O ₃ , and NiO; The polymer dewaxing agent includes polymers with non-polar groups and polar groups in the molecule, including homopolymers and copolymers; the molecular weight of the polymer dewaxing agent is between 4000 and 100000 ; The non-polar group includes a long-chain alkyl group, and the polar group includes an ester group, a ketone group, an amino group, an amido group, and a sulfur group. 2. The magnetic dewaxing agent according to claim 1, characterized in that the particle diameter of the magnetic nanoparticles is 5-50nm. 3. The magnetic dewaxing agent according to claim 1, characterized in that, the magnetic nanoparticles and the polymer dewaxing agent are compounded together by solution blending or melt blending. 4. The magnetic dewaxing agent according to claim 1, characterized in that, the polymer dewaxing agent comprises polyacrylic higher carbon alcohol ester and/or polyethylene-vinyl acetate. 5. A magnetic dewaxing method, characterized in that the method comprises: Provide a preset quality magnetic dewaxing agent, the magnetic dewaxing agent includes magnetic nanoparticles and a polymer dewaxing agent coated on the outer periphery of the magnetic nanoparticles; the magnetic nanoparticles include Fe ₃ O ₄ , γ- One or a combination of two or more of Fe ₂ O ₃ , Co ₂ O ₃ , and NiO; the polymer dewaxing agent includes high molecular polymers with non-polar groups and polar groups in the molecule , including homopolymers and copolymers; the molecular weight of the polymer dewaxing agent is between 4,000 and 100,000; the non-polar groups include long-chain alkyl groups, and the polar groups include ester groups, ketone groups, Amino, amido, sulfur; Mixing the preset quality magnetic dewaxing agent with the preset quality oil product to be treated to obtain a mixture; cooling the mixture to a preset temperature or below, crystallizing the wax on the surface of the magnetic dewaxing agent to obtain a magnetic dewaxing agent containing precipitated wax; A magnetic field is applied to the mixture to precipitate the magnetic dewaxing agent including the precipitated wax. 6. The method according to claim 5, characterized in that, when the preset mass of oil to be treated is 100g, the preset mass of magnetic dewaxing agent is 5-20mg. 7. The method according to claim 5, wherein the preset temperature is the waxing point of the oil to be treated. 8. The method according to claim 5, characterized in that, before the mixture is cooled to a preset temperature, it also includes: The mixture was heated to 50-80° C. and stirred by mechanical stirring for 0.2-1 h. 9. The method according to claim 5, characterized in that, applying a magnetic field to the mixture, after the magnetic dewaxing agent is separated out, also includes: The mixture is filtered to separate the magnetic dewaxing agent including precipitated wax from the mixture. 10. The method of claim 5, wherein the magnetic field is from a permanent magnet or an electromagnet.