Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
January 20, 2009
Patent Application Number
11883987
Date Filed
March 15, 2006
Patent Primary Examiner
Patent abstract
Chlorosilanes such as dimethyldichlorosilane are hydrolyzed in a first super-azeotropic hydrochloric acid distillation column A to produce cyclosiloxanes, chlorosiloxanes, and hydrogen chloride gas. The cyclosiloxanes and the chlorosiloxanes are washed and separated according to their volatility in a second sub-azeotropic hydrochloric acid distillation column B, to produce a substantially chloride free volatile cyclosiloxane stream and a substantially chloride free non-volatile siloxane stream. The process is substantially chloride efficient.
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