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Method for hydrolyzing metallic salts with emulsions

A technology of metal salt and emulsion, which is applied in the direction of halosilane, silicon halide compound, aluminum halide, etc., can solve the problems of safety risk, high cost, high logistics management complexity, etc., and achieve the effect of delaying heat release

Inactive Publication Date: 2011-04-13
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the risk of accidents caused by starting up the plant and transporting contaminated equipment, this also leads to high logistical complexity in order to avoid downtime
The security risks and costs associated with it are considerable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: (continuous method)

[0025] At the test station, silicone oil AK35 (polydimethylsiloxane with a viscosity of 35 mPa, purchased from Wacker Chemie AG) and water from a receiving vessel in a ratio of 4:1 and 0.5% dodecylbenzenesulfonic acid were added to the Mixing and simultaneous delivery takes place in a rotary pump acting as a dissolver. The resulting emulsion was pumped through a Liebig tube covered with 60 kg of aluminum chloride at a throughput of 100 kg / h until the covering was completely dissolved. In a coalescer connected downstream and filled with glass cloth, the effluent mixture was separated into an aqueous phase and a silicone oil phase. The aqueous phase contains pale yellow spongy particles; it is led to the sewage plant through an absorbent made of activated carbon, and the silicone oil phase is led back to the receiver vessel. The amount of sewage discharged continuously from the separator is always replaced by fresh water. The reactio...

Embodiment 2

[0026] Embodiment 2: (intermittent test)

[0027] A mixture of 109 g of water and 313.5 g of silicone oil AK35 was first introduced into a 600 mL beaker and emulsified for 20 s using a dispersion rod (Ultraturrax). Subsequently, the emulsion was stirred with a paddle stirrer at 220 rpm and treated with metal chloride chips (aluminum chloride) weighing 14 g from chlorosilane production. The temperature increased from 23°C to a maximum of 44°C in 16 minutes and dropped to 40°C after 32 minutes after the solid had completely dissolved.

Embodiment 3

[0028] Embodiment 3: (intermittent test)

[0029] Mix 105.3g water, 302.4g silicone oil AK35 and 1.5g A mixture of AS3 acid (=dodecylbenzenesulfonic acid) was first introduced into a 600 mL beaker and emulsified for 20 s using a dispersion rod (Ultraturrax). Subsequently, the emulsion was stirred with a paddle stirrer at 220 rpm and treated with 13.5 g of metal chloride flakes (aluminum chloride) from chlorosilane production. The temperature increased from 23°C to a maximum of 46°C within 30 minutes and dropped to 39°C after 30 minutes after the solid had completely dissolved.

[0030] Comparative Example of Example 3 (not according to the invention)

[0031] 196.6 g of water was first introduced into the 600 mL beaker. 12.6 g of metal chloride chips (aluminum chloride) weighing 12.6 g from chlorosilane production were added under stirring with a paddle stirrer at 220 rpm. The temperature increased from 23°C to a maximum of 54°C in 30 seconds, until after 1 minute the sol...

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PUM

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Abstract

The invention relates to a method for hydrolyzing hydrolyzable metallic salts, the metallic salts being reacted with emulsions of a) water and b) an inert liquid.

Description

technical field [0001] The present invention relates to a process for the hydrolysis of hydrolyzable metal salts in emulsions of water and an inert liquid. Background technique [0002] In the reaction of chlorosilanes of metallurgical silicon with HCl gas to form trichlorosilane (TCS) and silicon tetrachloride (STC), both products are used, for example, as components for the production of semiconductor pure silicon, solar silicon and highly Dispersed silicic acid is the starting material, while metal salts, mainly metal chlorides, are formed as by-products of the reaction. Specifically, aluminum chloride and ferric chloride precipitate as solids upon cooling the reaction mixture. Depending on the process technology, it is important to selectively deposit solids in order to avoid changes of the liquid silane during the distillative work-up. Various methods of separating solid metal chlorides from processes are known. [0003] In DE 2623290A1, described Liebig tube (Liebig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107C01F7/48
CPCC01B33/107
Inventor 迈克尔·斯特普乌韦·佩特佐尔德克里斯蒂安·施尔林格
Owner WACKER CHEM GMBH