Hydrogenated silicone oil
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Does anyone know if it’s necessary to control the acid concentration during the first wash step for hydrogenated silicone oils? If control is needed, to what extent is it appropriate?
Which washing process are you referring to? Is it the mixing reaction stage of MH and M3, or the stratification stage after the reaction?
There’s no need to control this acid concentration – you added the reagents in fixed amounts earlier, right? After the reaction, the acid concentration will theoretically fluctuate within a certain range. During the separation phase, it’s mainly about separating oil from water, so controlling the acid concentration isn’t necessary. Moreover, HCl is a product of the reaction; how can its concentration be controlled? One can only control the amount of reagent added
As a supplementary note, this is a layering process, not a washing process; after layering, alkali treatment and dehydration follow... The water added earlier is used in the reaction, it’s not for washing
Yes, because the amount of desalinated water added during phase separation at stages one and two is different, the chlorine content after phase separation also varies. If the amount of water separated in stage 1 and stage 2 is the same, the chlorine content in the product is lowest; however, the designed process involves a larger amount of water being added in stage 1, with a relatively smaller amount added in stage 2 for desalination. So I would like to ask whether the large amount of water added in the first phase separation is intended to control the hydrochloric acid concentration.
Since I haven’t seen your flowchart, I don’t fully understand what you mean by level 1 and level 2, but I personally think that the large volume of water at level 1 implies a need for sufficient reaction time. Because the purpose of this process is to produce hydrogenated silicone oil, hydrochloric acid is merely a by-product. If one wants to control the concentration of hydrochloric acid, what is the reason for that? The concentration of this hydrochloric acid is around 20%.
Thank you so much. Are you also in the silicone monomer industry?