A method and device for cracking organosilicon hydrolyzate in solvent oil thermal flooding circulation

Abstract

The invention relates to an organic silicon hydrolysate pyrolysis method and device of solvent oil thermal drive circulation. Double spiral channels in a form of spiral-like plate heat exchanger are coaxially arranged in the middle of a pyrolysis device; the upper and lower ends of one spiral channel of the double spiral channels are not sealed, so that the spiral channel can serve as a pyrolysischannel, and the upper and lower ends of the other spiral channel are sealed to form a heat exchange medium channel; solvent oil is distributed in an annular space between the column consisting of thepyrolysis channel and the double spiral channels and the pyrolysis device; a mixture of organic silicon hydrolysate and KOH solution is fed into the pyrolysis channel; the heat exchange medium of theheat exchange channel provides heat to the pyrolysis channel; the organic silicon hydrolysate is mixed with solvent oil in the pyrolysis channel, and experiences vaporization while reacting; bubblesrise to drive the liquid in the pyrolysis channel to go up to the top of the pyrolysis channel; after gas-liquid separation, the solvent oil, the unreacted organic silicon hydrolysate and the KOH solution go down to the bottom of the pyrolysis device through the annular space, forming natural circulation. Without a stirring device, the heat and mass transfer efficiency is high, and local overheating is avoided; the production cycle of the device is prolonged, and the alkali consumption is reduced; moreover, the annulus yield as well as the quality of D4 and DMC is improved, and the operation is stable, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method and device for cracking organosilicon hydrolyzate in thermal flooding circulation of solvent oil. Background technique [0002] In the organic silicon industry, more than 85% of organic silicon products and products are made of organic silicon intermediates (such as octamethylcyclotetrasiloxane D 4 , Dimethylcyclosiloxane mixture DMC) production, therefore, the cleavage and rearrangement of dimethyldichlorosilane (referred to as dimethyl) hydrolyzate is particularly important. The cracking process is that the dimethyl hydrolyzate absorbs heat from the outside under the condition of a basic catalyst to perform cracking and rearrangement reactions to obtain about 60% D 4 , About 10% D 3 and around 20% D 5 The lysate, called dimethylcyclosiloxane mixture (DMC), can be obtained through further distillation of D with a purity greater than 99% (mass fraction). ...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the current technical status of cracking and rearranging kettles in the organic silicon industry, existing drawbacks and deficiencies, the first purpose of the present invention is to provide a method for cracking organosilicon hydrolyzate with solvent oil heat flooding and circulation, so as to solve the problem of conventional cracking kettles. Mass heat transfer, thorough mixing, production cycle deficiencies, while improving safety

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