Concentrated acid hydrolysis system used for organochlorosilane concentrated acid hydrolysis

Abstract

The invention relates to a concentrated acid hydrolysis system used for organochlorosilane concentrated acid hydrolysis, which utilizes a dispersion liquid film type absorption tower serving as a core and comprises accessory equipment such as a static mixer, an oil-water phase separator and a falling-film evaporator. The absorption tower comprises a casing, wherein a liquid distribution plate is fixedly mounted between an upper seal head and an outer barrel body of the absorption tower; a splash-proof screen mesh is arranged on the liquid distribution plate; 3-10 layers of neatly arrayed film forming plates are arranged below the liquid distribution plate and are supported horizontally; an included angle between every film forming plate and the water level ranges from 15 degrees to 75 degrees; and film forming plates are arrayed in a staggered manner between adjacent layers. According to the absorption tower, appropriate reacting pressure (0.1 MPa to 0.5 MPa of gauge pressure) enables HCl gas generated by hydrolysis to have sufficient pressure; the dispersion liquid film type absorption tower enables an organic phase and an aqueous phase to be contacted in a film manner, so that the hydrolysis reaction is sufficient without emulsion; and a phase separator is used to separate hydrolysates and concentrated hydrochloric acid rapidly, the hydrolysates are prevented from polymerizing under the acid catalysis, and the qualities of the hydrolysates are improved.

Description

technical field [0001] The invention relates to the technical field of organosilicon production, in particular to the improvement and innovation of a concentrated acid hydrolysis reaction system for siloxane production. Background technique [0002] Organochlorosilanes are transformed into linear or cyclic intermediate oligomeric organosiloxanes through hydrolysis and polycondensation, which are the basis for the synthesis of silicone oil, silicone rubber, and silicone resin. In particular, dimethyldichlorosilane (hereinafter referred to as dimethyl) is recognized as the best organochlorosilane for this hydrolysis and condensation reaction. [0003] The process methods usually used for dimethyl hydrolysis include azeotropic acid hydrolysis and concentrated acid hydrolysis. No matter which hydrolysis method is used, there are problems of whether the hydrolysis is complete and how to solve the reaction heat effect. In the process of azeotropic acid hydrolysis, since the produ...

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Problems solved by technology

[0005] Chinese patent CN101323666A uses a packed tower as a hydrolysis reactor, which increases the reaction residence time, and the hydrolysis reaction is relatively complete, but it cannot be avoided that organosiloxane will polymerize on the surface of the filler or between the filler gaps

Due to the low efficiency of the stirred tank reactor, in order to achieve sufficient reaction time, the capacity must be increased, which is not conducive to the production increase of the continuous process, and the operation flexibility is small, and the liquid is easy to emulsify

[0008] Although the above-mentioned patents can directly obtain gas phase HCl, from the examples, the pressure of HCl gas is relatively low, and it is not suitable to be directly used for the synthesis of chlorinated alkanes (CN1108267A describes the importance of HCl gas pressure)

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