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Hydrolysis method for material containing hydrolysable halogen atom

A technology of halogen atoms and substances, which is applied in the field of producing solid oxides and hydrogen halide products, can solve problems such as high operating costs, complex equipment, and difficult continuous reaction.

Active Publication Date: 2011-11-09
刘基扬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the low reaction temperature (compared with the reaction temperature of fumed white carbon black at 1000-2000°C) is not conducive to the dehydration of the formed silica, and the silica containing a large amount of hydroxyl groups is easy to stick to the fluidized bed reactor. On the wall, the reactor is blocked, making it difficult for the reaction to proceed continuously; the fluidized bed operation is used, the equipment is complicated, and the operation cost is high

Method used

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  • Hydrolysis method for material containing hydrolysable halogen atom
  • Hydrolysis method for material containing hydrolysable halogen atom

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050] According to the flow process in the accompanying drawings of the present invention, but there is no solid material circulation part of 10 in the accompanying drawings, the gas purification part of 14, 15 and 16 in the accompanying drawings and the inert gas stripping part of 11 in the accompanying drawings. The mixing part of the reaction and mixing unit 3 is a static mixer, the reaction part is a screw conveyor, and the gas purification unit 18 is composed of a cyclone separator and a condensing device (three-stage condensation is used, first cooled with water, and then cooled to -20 with frozen brine. ℃, and finally use a refrigerant (R507 or R404 can be used) to freeze to -40 ℃, and more than 99% of silicon tetrachloride can be condensed).

[0051] The substance containing hydrolyzable halogen atoms mentioned in this implementation experiment is silicon tetrachloride, and its purity is 99.4%.

[0052] Before the start of the experiment, the stirring of the gas-solid...

Embodiment approach 2

[0056] This implementation experiment follows the process flow in the accompanying drawings, but there is no gas purification part of 14, 15 and 16 in the accompanying drawings and the inert gas stripping part of 11 in the accompanying drawings. The reaction gas product from 17 is directly passed into the lower part of the storage tank 2, and the storage tank 2 is used as a bubbling reactor to achieve the purpose of gas product dust removal and residual reactants, that is, the storage tank 2 serves as the gas purification unit 18 at the same time. The reaction and mixing unit 3 is a screw conveyor.

[0057] The material containing hydrolyzable halogen atoms mentioned in this embodiment is the synthesis tail gas of trichlorosilane, and its volume composition is hydrogen 60~70%, hydrogen chloride 25~35%, trichlorosilane 4~6%, other (such as two Chlorine dihydrogen silicon, etc.) 0.1 to 0.6%.

[0058] Before the start of the experiment, the gas-solid separation and purifier 9 we...

Embodiment approach 3

[0061] The flow process of this implementation experiment is the same as that of Example 1, and the difference from Example 1 is that the mixing part of the reaction and mixing unit 3 is a booster Venturi mixer, and the reaction part is an air conveyor.

[0062] The substance containing hydrolyzable halogen atoms mentioned in this implementation experiment is the waste liquid of the raffinate collection tank of the polysilicon production plant. Its composition varies greatly with different sources, usually 1-5% of trichlorosilane, 10-30% of silicon tetrachloride, 40-60% of polychlorosilane, 5-20% of solid impurities such as metal silicon powder, Others (containing titanium tetrachloride, aluminum trichloride, boron trichloride, etc.) 1-5%.

[0063] Before the experiment starts, the gas-solid separation and the stirring of the purifier 9 are turned on. Turn on the condensing unit of 18. After the experiment started, the waste liquid in the storage tank 1 passed through 6 to r...

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Abstract

The invention discloses a short-procedure, less-investment and simple-operation hydrolysis method for a material containing hydrolysable halogen atom. The method is characterized in that: a material containing hydrolysable halogen atom and a material containing water are subjected to mixing and reacting in a mixing and reaction unit; at least one reactant reacts as completely as possible through controlling reaction conditions, in particular, a key point is that the resulting reaction products are dried solid oxide and gaseous hydrogen halide, then the solid oxide is removed from a gas-solid separation and purification unit, and the gaseous hydrogen halide is processed through a gas product cleaning unit. The solid oxide and the gaseous hydrogen halide prepared through the method are valuable commodities, and the gaseous hydrogen halide further can be applicable for a synthesis process of halide. In addition, the method can be applicable for processing industrial waste containing the hydrolysable halogen atom, and producing solid oxides and hydrogen halide through adopting compounds containing the hydrolysable halogen atom.

Description

technical field [0001] The present invention relates to a method for hydrolysis of substances containing hydrolyzable halogen atoms, especially the hydrolysis method for tail gas containing hydrolyzable halogen atoms, waste liquid or solid waste and their mixtures produced in industrial production processes. The invention relates to a method for producing solid oxides and hydrogen halide products through hydrolysis reaction of compounds capable of hydrolyzing halogen atoms and water as raw materials. technical background [0002] The organic silicon industry and the polysilicon industry are usually based on the reaction of industrial-grade metal silicon with chlorine or chloride, or the reaction of industrial-grade metal silicon with other halogens (such as fluorine, bromine, iodine or their compounds). These reactions generate large amounts of halide waste. [0003] Methylchlorosilane is an important monomer in the silicone industry. At present, methyl chloride and silico...

Claims

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Application Information

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IPC IPC(8): C01B33/18C01B7/03
Inventor 刘基扬
Owner 刘基扬
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