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Method and apparatus for preparing titanium dioxide by oxidation reactor

An oxidation reactor, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, fibrous fillers, etc., can solve the problem of unreasonable and effective scar prevention and scar removal measures, and the material cannot withstand high temperature oxidation corrosion and erosion , unreasonable structure design of the oxidation furnace, etc., to avoid macroscopic reverse flow, strengthen the effect of gas film protection, and achieve the effect of intense momentum exchange

Inactive Publication Date: 2005-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of intertwined processes such as turbulent flow, nucleation, and crystal nucleus growth in the reactor, it is very difficult to study the theory of oxidation reactors
At present, the problems existing in the application of titanium dioxide oxidation furnace reactors in our country are mainly as follows: (1) The operating cycle of the oxidation furnace is short, and the longest is less than 17 days (foreign advanced level, such as DuPont in the United States, mostly 30 to 60 days )
[0005] 1. There are unreasonable problems in the structure design of the oxidation furnace
[0006] 2. Scar prevention and scar removal measures are not reasonable enough
[0007] 3. Problems with the material of the oxidation furnace: the material cannot withstand long-term high-temperature oxidation corrosion and erosion, resulting in changes in the structure and geometric dimensions of the furnace during operation
Regarding the intake method of the titanium tetrachloride intake pipe, East China University of Science and Technology’s research shows that the gas flow in the intake ring during radial intake is the same as that of tangential intake, but due to the Coanda effect, the gas flow in the axial intake ring The flow direction is unstable, and the direct impact of the airflow on the wall at the inlet and the sudden expansion of the flow channel at the inlet will cause a large resistance loss. Therefore, the titanium tetrachloride inlet ring should use a tangential inlet method.

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  • Method and apparatus for preparing titanium dioxide by oxidation reactor

Examples

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Effect test

Embodiment 1

[0027] Example 1: Preventing Scarring

[0028] First, use a special preheater to heat the oxygen to about 1000°C. The design principle of the preheater is to increase the temperature of the oxygen entering the oxidation reactor as much as possible. Then use the combustion of toluene to heat the oxygen to the reaction temperature of about 1800°C; the hot TiCl 4 After the gas comes out of the preheater, it enters the AlCl 3 generator, the AlCl 3 It is the product of the reaction between aluminum powder and chlorine gas entering from the upper part of the generator, and the reaction product AlCl 3 Exothermic, the TiCl 4 and AlCl 3 The mixing temperature rises to 550°C, and the mixed fluid enters the TiCl 4 oxidation reactor.

[0029] Using secondary oxygen in TiCl 4 After the feeding ring, the high-speed tangentially enters the reactor, and the rectified high-speed secondary oxygen forms an air curtain cooling layer on the inner wall of the mixing zone of the reactor and t...

Embodiment 2

[0030] Example 2: Preventing Scarring

[0031] First, preheat the oxygen to 800°C, and then use the combustion of toluene to heat the oxygen to the reaction temperature of 1600°C; heat TiCl 4 After the gas comes out of the preheater, it enters the AlCl 3 Generator, TiCl 4 and AlCl 3 The mixing temperature rises to 500°C, and the mixed fluid enters the TiCl 4 oxidation reactor. Using secondary oxygen in TiCl 4 After the feeding ring, the high-speed tangentially enters the reactor, and the rectified high-speed secondary oxygen forms an air curtain cooling layer on the inner wall of the mixing zone of the reactor and the subsequent reaction zone (cylindrical cooling zone), and there is no sintering scar layer in the reactor .

Embodiment 3

[0032] Embodiment 3: titanium dioxide quality control

[0033] The average particle size of the particles depends on the number of crystal nuclei formed in the reaction. The number of crystal nuclei depends on the activity and quantity of the nucleating species at the reaction temperature. In order to control the number of crystal nuclei, on the one hand, the degree of gas mixing is controlled, and on the other hand, the reaction temperature is controlled. A high reaction temperature will form too many crystal nuclei, resulting in a thinner average particle; a low reaction temperature will form too few crystal nuclei, resulting in a coarser average particle. In this process, the jet feeding of titanium tetrachloride is very critical, because it involves the realization of oxygen and TiCl 4 Quick, even mixing. If the two reactants are not mixed uniformly, the resulting particles may be of different sizes. Even if the average particle size meets the requirements, the particle...

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Abstract

The present invention is a two-stage heating process and apparatus for preparing titanium dioxide. The reactant material TiCl4 and O2 is prepared 400-600 deg.c and 800-1000 deg.c in the pre-heating furnace and then led into the oxidizing reactor, where atomized fuel and crystal form converting agent AlCl3 are introduced and the material is heated to 1500-1800 deg.c directly under positive pressure condition, with the product being collected with bag filter. The apparatus includes burning area, mixing reaction area with feeding ring, cooling area, material feeding pipes, cooling water inlet and outlet and cylindrical rings. The present invention his the advantages of high product quality, less scaling and long life of reactor.

Description

technical field [0001] The invention belongs to the technical field of preparing titanium dioxide by a chlorination method, and in particular provides a method and a device for preparing titanium dioxide in a novel oxidation reactor, which are suitable for industrialized production of titanium dioxide. technical background [0002] Titanium dioxide is an important fine chemical product, widely used in coatings (60%), plastics (16%), papermaking (14%), ink (3%), chemical fiber, rubber, etc. (7%) industrial sectors. People's annual consumption is greater than 1.0kg, the world average is 0.45kg, while our country is only 0.04kg. Titanium dioxide production methods include sulfuric acid method and chlorination method. The sulfuric acid method is currently being gradually reduced and forced to close due to problems such as excessive waste, high energy consumption and low product quality. The general development trend of the world's titanium dioxide industry is to change from the...

Claims

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Application Information

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IPC IPC(8): C01G23/047C09C1/36
Inventor 袁章福王志周峨杨绪壮关璐
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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