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A kind of hydrolysis method of the substance containing hydrolyzable halogen atom

A halogen atom and material technology, applied in the field of producing solid oxides and hydrogen halide products, can solve the problems of reactor blockage, low reaction temperature and high operating cost

Active Publication Date: 2015-11-25
刘基扬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of hydrolysis method of the substance containing hydrolyzable halogen atom

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Experimental program
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Effect test

Embodiment approach 1

[0050] According to the process in the drawings of the present invention, but without the solid material circulation part 10 in the drawings, the gas purification parts 14, 15 and 16 in the drawings, and the inert gas stripping part 11 in the drawings. The mixing part of the reaction and mixing unit 3 is a static mixer, and the reaction part is a screw conveyor. The gas purification unit 18 is composed of a cyclone separator and a condensing device (using three-stage condensation, first with water cooling, and then with chilled brine to -20 ℃, finally use a refrigerant (R507 or R404 can be used) to freeze to -40 ℃, more than 99% of silicon tetrachloride can be condensed).

[0051] The substance containing hydrolyzable halogen atoms mentioned in this experiment is silicon tetrachloride with a purity of 99.4%.

[0052] Before the start of the experiment, turn on the stirring of the gas-solid separation and purifier 9 and the lower heating device to control the wall temperature of the...

Embodiment approach 2

[0056] The experiment was carried out according to the process in the figure, but without the gas purification part of 14, 15 and 16 in the figure and the inert gas stripping part of 11 in the figure. The reaction gas products from 17 are 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 dust removal and residual reactants of the gas products, that is, the storage 2 also serves as a gas purification unit 18. The reaction and mixing unit 3 is a screw conveyor.

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

[0058] Before the start of the experiment, the gas-solid separation and purifier 9 is filled with 2 / 3 of its volume, the powdered silica produced in E...

Embodiment approach 3

[0061] The flow of this experiment is the same as that of Example 1. 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 a gas flow conveyor.

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

[0063] Before starting the experiment, start the stirring of the gas-solid separation and purifier 9 first. Turn on the 18 condenser. After the start of the experiment, the waste liquid in the storage tank 1 was increased to 5MPa in pressure through 6 a...

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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 hydrolysis method for substances containing hydrolyzable halogen atoms, in particular to the hydrolysis method of tail gas, waste liquid or solid waste containing hydrolyzable halogen atoms and their mixtures produced during industrial production. A method for producing solid oxides and hydrogen halide products through hydrolysis reaction of compounds and water that can hydrolyze halogen atoms. technical background [0002] The organic silicon industry and the polysilicon industry are usually based on the reaction of industrial grade metallic silicon with chlorine or chloride, or the reaction of industrial grade metallic silicon with other halogens (such as fluorine, bromine, iodine or their compounds). These reactions will produce a large amount of halide waste. [0003] Methylchlorosilane is an important monomer in the silicone industry. At present, it is widely used at home and abroad to directly synthesize chlorosilane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18C01B7/03
Inventor 刘基扬
Owner 刘基扬
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