Integrated reaction system for siloxane cracking

Abstract

The invention discloses a siloxane pyrolysis integrated reaction system which comprises a cylindrical kettle body. A central spindle connected with an external motor is vertically arranged inside the kettle body. The system is characterized in that three layers of stirrers are vertically arranged on the central spindle; a circulatory diversion heat-exchange cylinder with upper and lower openings sleeves the periphery of the stirrers; the upper end of the circulatory diversion heat-exchange cylinder is provided with a feed diversion distributor; 4-6 side-wall diversion full-baffles are uniformly distributed on the inner wall of the kettle body; the upper end of the kettle body is connected with a rectifying tower; the three layers of stirrers are an upper turbine-type agitator, a middle turbine-type agitator and a lower turbine-type agitator; the circulatory diversion heat-exchange cylinder is a frustum-shaped structure with big top and small bottom; and the body of the circulatory diversion heat-exchange cylinder is an annular enclosed structure enclosed by two layers of heat exchange plates, outer surfaces of which are embossed. The system provided by the invention has the following advantages: three-step reactions of the pyrolysis process are effectively controlled; heat exchange effect is improved; flow field of a pyrolysis kettle is optimized; and the purpose of raising yield of the annular body, stabilizing production, prolonging reaction period and improving quality of the annular body is achieved.

Description

technical field [0001] The invention relates to a siloxane cracking integrated reaction system. Background technique [0002] Siloxane is an important intermediate in the production of organosilicon, and it is the basic raw material for the preparation of polyorganosiloxanes such as silicone rubber and silicone oil. At present, the production process of siloxane is to carry out cracking and rearrangement reaction of chlorosilane hydrolyzate under the condition of basic catalyst to obtain hexamethyltrisiloxane, octamethyltetrasiloxane, decamethylpentasilicone The pyrolysis product of oxane, etc. The lysate is then purified and separated to obtain siloxane products. [0003] The cracking of siloxane is usually carried out in a stirring siloxane cracking tank. Under the catalysis of alkaline potassium hydroxide, the chlorosilane hydrolyzate undergoes a three-step reaction in the cracking tank: terminal hydroxyl replacement, condensation, ring formation and ring opening equil...

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned disclosed patents and documents have carried out a series of improvements to the equipment and operating conditions of the dimethyldichlorosilane hydrolyzate cracking process, its effect has not been significantly improved

Especially how to effectively control the occurrence of the three-step reaction in the cracking process without mentioning and improving

If it is not possible to make thorough improvements in the "three transmissions and one reaction" that play a key role in the cracking process, such as effectively controlling the reaction of the cracking process, improving the heat transfer effect, and optimizing the flow field of the cracking tank, it will be difficult to break through the existing technical level

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