Method for splitting dimethyl dichlorosilane hydrolysate
A technology of dimethyldichlorosilane and hydrolyzate, applied in the directions of organic silicon compounds, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of inability to separate products, increase the difficulty of refining, increase production costs, etc. Comprehensive alkalinity enhancement, strong catalytic activity, and the effect of reducing pollution
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Embodiment 1
[0021] (1) Add 100Kg of strongly basic macroporous anion exchange resin, 40Kg of potassium hydroxide, 2Kg of potassium trimethylsiliconate, [bmim]BF to the 1000L reactor 4 0.3Kg of ionic liquid and 300Kg of ethanol were reacted at 40°C for 10h, filtered and dried to obtain a composite catalyst, which was used for later use.
[0022] (2) Add 100Kg of hydrolyzate, 15Kg of solvent oil, and 4Kg of composite catalyst into the 1000-degree pyrolysis kettle. At a temperature of 120°C, the cracking reaction pressure is 0.07Mpa, the residence time of the hydrolyzate is 1h, and the hydrolyzate is cracked and rearranged to obtain a ring mixture, After washing with water, high boilers and low boilers are removed to obtain pure octamethylcyclotetrasiloxane D4 and mixed cyclosiloxane DMC and other products. The reaction yield and the content of pure octamethylcyclotetrasiloxane D4 in the product are shown in Table 1.
Embodiment 2
[0024] (1) Add 100Kg of strong basic macroporous anion exchange resin, 20Kg of potassium hydroxide, 1Kg of potassium trimethylsiliconate, [bmim]BF to the 1000L reactor 4 0.1Kg of ionic liquid and 200Kg of ethanol were reacted at 30°C for 20h, filtered and dried to obtain a composite catalyst, which was used for later use.
[0025] (2) Add 100Kg of hydrolyzate, 3Kg of solvent oil, and 4Kg of composite catalyst into the 1000-degree pyrolysis kettle, at a temperature of 100°C, the cracking reaction pressure is 0.04Mpa, the residence time of the hydrolyzate is 2h, and the hydrolyzate is cracked and rearranged to obtain a ring mixture, After washing with water, high boilers and low boilers are removed to obtain pure octamethylcyclotetrasiloxane D4 and mixed cyclosiloxane DMC and other products. The reaction yield and the content of pure octamethylcyclotetrasiloxane D4 in the product are shown in Table 1.
Embodiment 3
[0027] (1) Add 100Kg of strong basic macroporous anion exchange resin, 50Kg of potassium hydroxide, 5Kg of potassium trimethylsiliconate, [bmim]BF to the 1000L reactor 4 0.5Kg of ionic liquid and 500Kg of ethanol were reacted at 60°C for 5h, filtered and dried to obtain a composite catalyst, which was used for later use.
[0028] (2) Add 100Kg of hydrolyzate, 30Kg of solvent oil, and 4Kg of composite catalyst into the 1000-degree pyrolysis kettle. At a temperature of 150°C, the cracking reaction pressure is 0.09Mpa, the residence time of the hydrolyzate is 0.5h, and the hydrolyzate is cracked and rearranged to obtain a ring mixture After washing with water, high boilers and low boilers are removed to obtain pure octamethylcyclotetrasiloxane D4 and mixed cyclosiloxane DMC and other products. The reaction yield and the content of pure octamethylcyclotetrasiloxane D4 in the product are shown in Table 1.
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