Organochlorosilane hydrolysis and hydrochloric acid refining system and method

An organochlorosilane and refining system technology, applied in chemical instruments and methods, inorganic chemistry, chlorine/hydrogen chloride, etc., can solve problems such as shortening the start-up cycle, reducing the yield of siloxane, and affecting the synthesis process of methyl chloride

Active Publication Date: 2020-02-28
SEDIN NINGBO ENG
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  • Abstract
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Problems solved by technology

However, during the HCl analysis process, part of the light oil phase will be taken out and follow the HCl gas to the HCl washing tower and HCl absorption tower. Over time, it will cause blockage of corresponding equipment and pipelines, which will increase the frequency of shutdown and maintenance, resulting in Lower siloxane yields and shorter start-up cycles
In addition, the presence of siloxane in HCl gas will also affect the synthesis process of methyl chloride

Method used

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  • Organochlorosilane hydrolysis and hydrochloric acid refining system and method

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specific Embodiment 1

[0033] An organochlorosilane hydrolysis and hydrochloric acid refining system, such as figure 1 As shown, it includes a hydrolysis tower 1, a primary phase separator 2, a secondary phase separator 3, a first hydrochloric acid purification tower 4, a decompression tank 5, a second hydrochloric acid purification tower 6, a first extraction tower 7, and a second extraction tower. Tower 8, stripper 99 and wire-loop separation tower 10, the side of hydrolysis tower 1 is provided with multi-section feed inlet, the upper oil phase outlet of hydrolysis tower 1 is connected with the feed inlet of primary phase separator 2, and the first stage The oil phase outlet of the phase separator 2 is connected with the feed port of the secondary phase separator 3, the top gas phase outlet of the hydrolysis tower 1, the gas phase outlet of the primary phase separator 2 and the gas phase outlet of the secondary phase separator 3 are respectively connected The first condenser 11, the top gas phase ...

specific Embodiment 2

[0036] A method for organochlorosilane hydrolysis and hydrochloric acid refining, comprising the following steps:

[0037] (1) After the pressurized liquid phase dimethyl dichlorosilane of 0-0.5MPaG is vaporized by the vaporizer 17 or the liquid phase dimethyl dichlorosilane is heated by the heat exchanger 13, it is sent into the hydrolysis tower 1 in sections Carry out the hydrolysis reaction, control the reaction temperature in the hydrolysis tower 1 to 20-60°C, and control the pressure to 0-0.5MPaG, send the gas phase obtained from the reaction to the first condenser 11, and send the oil phase obtained from the reaction to the primary phase separator 2; Dimethyldichlorosilane in the hydrolysis tower 1 adopts gas-phase multi-stage feeding, and the feeding amount of each section of dimethyldichlorosilane is 40-90%, 40-5% and 20-5%;

[0038] (2) Control the pressure of the primary phase separator 2 to the same pressure as that of the hydrolysis tower 1 for three-phase separati...

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Abstract

The invention discloses an organochlorosilane hydrolysis and hydrochloric acid refining system and a method. The organochlorosilane hydrolysis and hydrochloric acid refining system is characterized bycomprising a hydrolysis tower, a primary phase separator, a secondary phase separator, a first hydrochloric acid purification tower, a decompression tank, a second hydrochloric acid purification tower, a first extraction tower, a second extraction tower, a stripping tower and a line-loop separation tower; a plurality of sections of feeding holes are formed in the side part of the hydrolysis tower; an oil phase outlet at the upper end of the hydrolysis tower is connected with a feeding hole of the primary phase separator; an oil phase outlet of the primary phase separator is connected with a feeding hole of the secondary phase separator; a top gas phase outlet of the hydrolysis tower, a gas phase outlet of the primary phase separator and a gas phase outlet of the secondary phase separatorare respectively connected with a first condenser; a top gas phase outlet of the first condenser is connected with a lower end feeding hole of the first hydrochloric acid purification tower, the upperend of the first hydrochloric acid purification tower is provided with a fresh hydrochloric acid solution inlet, and the bottom of the first hydrochloric acid purification tower is provided with an oil phase outlet. The organochlorosilane hydrolysis and hydrochloric acid refining system has advantages of high reaction conversion rate and high product purity.

Description

technical field [0001] The invention relates to an organochlorosilane hydrolysis and hydrochloric acid refining system and method. Background technique [0002] In the production process of organosilicon, it is an important link in the production process of organosilicon to obtain organosiloxane through a series of hydrolysis reactions in the reactor. The level of technology in this link is directly related to the quality of silicone products and the recovery efficiency of chlorine in raw materials. An excellent hydrolysis solution can effectively reduce the production cost of silicone products. [0003] After the traditional process of dimethyldichlorosilane undergoes pressurized hydrolysis reaction, the obtained products mainly include polysiloxane (hydrolyzate) and concentrated hydrochloric acid. The hydrolysis feed method is obtained by mixing liquid phase dimethyldichlorosilane and hydrochloric acid. Hydrolyzate siloxane, the hydrolyzate carrying a small amount of conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/06C01B7/07
CPCC01B7/0706C01B2210/0025C01B2210/0068C08G77/04C08G77/06
Inventor 李全李升大王宇光谷新春李国华袁小建彭永红厉相陶小钰李阳何欣蔚路怀良曹亮张志周剑李志柴新刚
Owner SEDIN NINGBO ENG
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