Questions regarding cracking in silicone intermediates
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In the production of silicone intermediates, the cleavage of hydrolyzates requires KOH as a catalyst; the typical amount of KOH used is 40%, but this amount is based on a situation where the content of linear molecules in the hydrolyzates is around 40%. Currently, the amount of linear molecules in our hydrolyzates is about 10%, so the amount of KOH used should be reduced. But by what proportion should it be reduced? Is there any linear relationship between the amount of linear molecules and the amount of KOH added? Does any expert know?
I also work with silicone. We have workshops for pyrolysis and silicone oil production, but I am in charge of manufacturing silicone oil
10% of the linear form after hydrolysis? That’s amazing! Was a solvent added?
I have a few questions: 1. The 40% mentioned for the alkali solution refers to the concentration, not the total amount, right? When the amount of the substance in your sample exceeds a certain level, what you increase is the total amount, and this actually has little to do with the concentration. 2. Under the action of strong alkalis, linear structures break down into cyclic structures; however, an excess of alkali can have negative effects, leading to an increase in the molecular weight of the linear structures. Decomposition is a process, and I believe that the amount to be controlled should be determined by referring to real-time analysis data of the cyclic structures, rather than solely based on the total content of linear structures in the hydrolysis products. This relies entirely on a combination of data and experience; you’ll have to figure it out gradually, but data analysis must be carried out promptly. Experience is a treasure.
The KOH used for pyrolysis is prepared as a 40% solution, and the typical amount used is 0. 4%-0. 5%. With less linear body, a smaller amount of catalyst can be used; when 10% linear body is present, the catalyst amount can be reduced to 2. 5%; there is no specific formula for the amount of catalyst to be used – it depends mainly on the cracking efficiency and experience.