CN112250108A

CN112250108A - Production method of titanium white chloride primary product for plastics

Info

Publication number: CN112250108A
Application number: CN202011192090.0A
Authority: CN
Inventors: 高毅安; 夏建辉; 万健龙; 陆平; 杜明; 周艾然; 李冬琴
Original assignee: Titanium Industry Co Ltd of Pangang Group
Current assignee: Titanium Industry Co Ltd of Pangang Group
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-01-22

Abstract

The invention relates to a method for producing a primary titanium dioxide chloride product for plastics, and belongs to the technical field of titanium dioxide production by a chlorination method. The invention provides a production method of a titanium white chloride primary product for plastics, which comprises the following steps: titanium tetrachloride is preheated to 350-550 ℃, oxygen is preheated to 1600-1800 ℃, the titanium tetrachloride and the oxygen are respectively conveyed into an oxidation reactor, aluminum trichloride and potassium chloride aqueous solution are added into the reactor, wherein the mass of the aluminum trichloride accounts for 1.0-1.4% of the mass of the titanium tetrachloride, the mass of the potassium chloride accounts for 0.01-0.05% of the mass of the titanium tetrachloride, and the titanium tetrachloride and the oxygen are subjected to gas phase oxidation reaction in the oxidation reactor to generate titanium dioxide. The titanium chloride white primary product produced by the method has fine granularity, can reach the level of 180 +/-10 nm, is uniformly distributed, has better blue phase, and is particularly suitable for being applied to the plastic industry.

Description

Production method of titanium white chloride primary product for plastics

Technical Field

The invention relates to a method for producing a primary titanium dioxide chloride product for plastics, and belongs to the technical field of titanium dioxide production by a chlorination method.

Background

At present, there are two mainstream processes for producing titanium dioxide: chloride and sulfate processes. Compared with the sulfuric acid method, the chlorination method has the advantages of high automation degree, advanced technology, high quality and environmental protection, thereby gradually becoming the main trend of the development of the titanium dioxide industry. The titanium dioxide has stable property, is the best white pigment at present, and is widely applied to the fields of coatings, plastics, papermaking, printing ink and the like. In recent years, the plastic industry develops rapidly, and becomes the second largest application field of titanium dioxide. The granularity requirement of the titanium dioxide pigment in the plastic industry is fine, and is generally 170-200 nm, so that a bluer bottom phase can be obtained, the yellow in the resin can be better shielded, the using amount of the titanium dioxide is reduced, and the cost of users in the plastic industry is reduced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a method for producing titanium white chloride primary products for plastics.

The invention provides a production method of a titanium white chloride primary product for plastics, which comprises the following steps: titanium tetrachloride is preheated to 350-550 ℃, oxygen is preheated to 1600-1800 ℃, the titanium tetrachloride and the oxygen are respectively conveyed into an oxidation reactor, aluminum trichloride and potassium chloride aqueous solution are added into the reactor, wherein the mass of the aluminum trichloride accounts for 1.0-1.4% of the mass of the titanium tetrachloride, the mass of the potassium chloride accounts for 0.01-0.05% of the mass of the titanium tetrachloride, and the titanium tetrachloride and the oxygen are subjected to gas phase oxidation reaction in the oxidation reactor to generate titanium dioxide.

Furthermore, the concentration of the potassium chloride aqueous solution is 20 g/L-100 g/L.

Further, the concentration of the potassium chloride aqueous solution is 100 g/L.

Furthermore, the adding amount of the potassium chloride aqueous solution is 20L/h-30L/h.

Further, the addition amount of the potassium chloride aqueous solution is 30L/h.

Further, the production method also comprises the following steps: cooling the gas-solid mixture generated by the oxidation reaction through a water bath metal guide pipe, controlling the tail end temperature of the guide pipe to be 160-200 ℃, controlling the pressure of circulating chlorine to be 100-200 kPa, and carrying out gas-solid separation on the cooled gas-solid mixture to obtain a titanium dioxide chloride primary product.

Further, the temperature of the catheter tip was controlled to 160 ℃.

Further, the pressure of the circulating chlorine gas was 100 kPa.

Further, the content of potassium chloride in the titanium white chloride primary product is 150-1200 ppm; the mass fraction of the alumina in the titanium white chloride primary product is 1.2%.

Further, the particle size of the titanium chloride white primary product is 180 +/-10 nm.

The invention provides a production method of a titanium white chloride primary product for plastics. By adjusting the technological parameters such as oxygen temperature, the addition of aluminum trichloride and potassium chloride and the like, the titanium chloride white produced by the method has fine primary product granularity, can reach the level of 180 +/-10 nm, is uniformly distributed, has better blue phase, and is particularly suitable for being applied to the plastic industry. In addition, the production method has the advantages of low cost and simple operation, and can bring obvious economic benefit if popularized and applied in the titanium white chloride industry.

Detailed Description

Compared with the existing method for producing the titanium chloride white primary product for general use or coating, the method provided by the invention is mainly improved on the process parameters such as the dosage of aluminum trichloride and potassium chloride, the oxygen preheating temperature and the like. In the original process, the mass of aluminum trichloride is generally about 0.6 percent of that of titanium tetrachloride, the addition amount of potassium chloride is also lower, and the preheating temperature of oxygen is about 1500 ℃. The inventor finds that the primary titanium chloride white product produced under the condition has a coarse particle size, most of which exceeds 200nm, and is not suitable for the field of plastics. The method improves the dosage of aluminum trichloride from 0.6% to 1.0% -1.4%, improves the dosage of potassium chloride to 0.01% -0.05%, and increases the preheating temperature of oxygen from about 1500 ℃ to 1600 ℃ -1800 ℃, so that the titanium chloride white primary product with the granularity of 180 +/-10 nm, uniform distribution and better blue phase is produced, and the method is particularly suitable for the plastic industry.

In addition, by adopting the production method, the pressure of the circulating chlorine can be reduced from about 300kPa to 100-200 kPa, the production cost is reduced, and the production safety is higher.

The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

Example 1 production of titanium white chloride Primary product by the Process of the invention

Preheating titanium tetrachloride to 480 ℃, preheating oxygen to 1650 ℃, respectively conveying the titanium tetrachloride and the oxygen to an oxidation reactor, and carrying out gas phase oxidation reaction in the oxidation reactor; simultaneously, adding aluminum trichloride into the reaction zone in the following manner: aluminum powder and chlorine react in an aluminum trichloride generator according to the theoretical quantity, the generated aluminum trichloride and titanium tetrachloride gas flow are jointly conveyed to an oxidation reactor, and the mass of the aluminum trichloride accounts for 1.0-1.4% of that of the titanium tetrachloride; and simultaneously adding a potassium chloride aqueous solution into the reaction zone, wherein the concentration of the potassium chloride aqueous solution is 100g/L, the addition amount is 30L/h, and the mass of potassium chloride accounts for 0.01-0.05% of that of the titanium tetrachloride. The gas-solid mixture generated by the reaction is cooled by a water bath metal guide pipe, and the tail end temperature of the guide pipe is controlled to be 160 ℃ by adding a certain amount of rock salt. And (3) carrying out gas-solid separation on the cooled gas-solid mixture to obtain a titanium chloride white primary product, wherein the pressure of the circulating chlorine gas is controlled at 100kPa, and the pressure is adjusted and controlled through the opening change of a flow regulating valve on a circulating chlorine gas pipeline. The average particle size of the titanium white chloride primary product produced by the embodiment is 180 +/-10 nm, and the titanium white chloride primary product is suitable for being applied to the plastic industry. Wherein the mass fraction of the alumina in the titanium white chloride primary product is 1.2 percent, and the mass fraction of the potassium chloride in the titanium white chloride primary product is 1200 ppm.

It should be appreciated that the particular features, structures, materials, or characteristics described in this specification may be combined in any suitable manner in any one or more embodiments. Furthermore, the various embodiments and features of the various embodiments described in this specification can be combined and combined by one skilled in the art without contradiction.

Claims

1. The production method of the titanium white chloride primary product for the plastic is characterized by comprising the following steps of: the method comprises the following steps: titanium tetrachloride is preheated to 350-550 ℃, oxygen is preheated to 1600-1800 ℃, the titanium tetrachloride and the oxygen are respectively conveyed into an oxidation reactor, aluminum trichloride and potassium chloride aqueous solution are added into the reactor, wherein the mass of the aluminum trichloride accounts for 1.0-1.4% of the mass of the titanium tetrachloride, the mass of the potassium chloride accounts for 0.01-0.05% of the mass of the titanium tetrachloride, and the titanium tetrachloride and the oxygen are subjected to gas phase oxidation reaction in the oxidation reactor to generate titanium dioxide.

2. The method of claim 1, wherein: the concentration of the potassium chloride aqueous solution is 20 g/L-100 g/L.

3. The method of claim 2, wherein: the concentration of the potassium chloride aqueous solution is 100 g/L.

4. The production method as set forth in any one of claims 1 to 3, characterized in that: the addition amount of the potassium chloride aqueous solution is 20L/h-30L/h.

5. The method of claim 4, wherein: the addition amount of the potassium chloride aqueous solution is 30L/h.

6. The production method as set forth in any one of claims 1 to 5, characterized in that: also comprises the following steps: cooling the gas-solid mixture generated by the oxidation reaction through a water bath metal guide pipe, controlling the tail end temperature of the guide pipe to be 160-200 ℃, controlling the pressure of circulating chlorine to be 100-200 kPa, and carrying out gas-solid separation on the cooled gas-solid mixture to obtain a titanium dioxide chloride primary product.

7. The method of claim 6, wherein: the temperature of the catheter tip was controlled to 160 ℃.

8. The method of claim 6, wherein: the pressure of the circulating chlorine gas was 100 kPa.

9. The production method as set forth in any one of claims 1 to 8, characterized in that: the content of potassium chloride in the titanium white chloride primary product is 150-1200 ppm; the mass fraction of the alumina in the titanium white chloride primary product is 1.2%.

10. The method of claim 1, wherein: the granularity of the titanium chloride white primary product is 180 +/-10 nm.