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A method and device for cracking organosilicon hydrolyzate in solvent oil thermal flooding circulation
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A pyrolysis device, solvent oil technology, applied in the direction of silicon organic compounds, chemical instruments and methods, chemical/physical processes, etc., to achieve the effect of high heat transfer coefficient, less by-products and balanced temperature
Active Publication Date: 2020-06-16
QINGDAO KEDA LONGTENG TECH DEV +1
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[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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[0039] When the thermal drive circulation type cracking kettle of the present invention is used as 30,000 tons / year dimethyl hydrolyzate cracking, 1 ton of hydrolyzate needs 0.4 ton of steam, hydrolyzate: 50% KOH solution (volume)=1:0.01, product purity: D. 4 ≥99.5%, DMC (D 4 +D 5 ) ≥ 86.5%, the heat exchange area needs to be 80m after heat calculation 2 , the size of the spiral plate heat exchanger its structure see figure 1 , figure 2 .
[0040] After being preheated, the mixture of dimethyl hydrolyzate and KOH solution enters the cracking kettle from the lower feed port 106, enters the corresponding cracking channel 122 through the upper nozzle of the liquid distributor 104 and mixes with solvent oil, and absorbs heat from the heat exchange channel 121 , vaporize while reacting, the rise of the bubbles drives the liquid in the cracking channel to rise to the top of the cracking...
[0045] When the thermal drive circulation type cracking kettle of the present invention is used as 55,000 tons / year dimethyl hydrolyzate cracking, 1 ton of hydrolyzate needs 0.392 tons of steam, hydrolyzate: 50% KOH solution (volume)=1:0.009, product purity: D. 4 ≥99.5%, DMC (D 4 +D 5 )≥86.7%, the heat exchange area needs to be 150m after heat calculation 2 , the size of the spiral plate heat exchanger its structure see figure 1 , figure 2 .
[0046] After being preheated, the mixture of dimethyl hydrolyzate and KOH solution enters the cracking kettle from the lower feed port 106, enters the corresponding cracking channel 122 through the upper nozzle of the liquid distributor 104 and mixes with solvent oil, and absorbs heat from the heat exchange channel 121 , vaporize while reacting, the rise of the bubbles drives the liquid in the cracking channel to rise to the top of the cracking...
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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). ...
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