Treatment of silicon tetrachloride residue issue
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This post was last edited by wangli115 on 2011-9-7 22:17. To reduce production costs, the silicon tetrachloride produced must undergo a hydrogenation reaction to be converted back into silicon trichloride hydride. During the hydrogenation process, a certain amount of residual liquid is discharged from the system (a small quantity of dirty silicon tetrachloride containing silicon powder, catalyst, and some high-boiling substances). Please discuss how to handle this dirty material
If there is a large amount of liquid present, the chlorosilane can be distilled out; if there is little liquid, it can be treated by hydrolysis using lime milk solution or water!
Steaming it directly upstairs is indeed a good method
How to steam.................
GT used to use evaporation tanks or flash tanks for direct evaporation, with steam used for heating!
Can a level gauge be used for an evaporation tank or a flash tank?
After distillation, the remaining solid residues are difficult to dispose of
For hydrolysis treatment, a large amount of lime is required, the load on waste treatment facilities is high, and the volume of material that can be processed through hydrolysis is limited. After much consideration, it seems that there are only two methods: filtration and purification, as well as distillation. It hasn’t been tried yet
Dust and impurities in the remaining darkness are extremely dangerous, as they can easily explode and catch fire.
I hope some expert can suggest a more practical method. Urgent urgent urgent.....................
Is it feasible to first filter, then purify, and hydrolyze the residual liquid a second time?