Method for purifying contaminated gaseous hydrogen chloride
AssigneeWacker Chemie AG
InventorKonrad Mautner
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Abstract
Impure gaseous hydrogen chloride from organochlorosilane hydrolysis is freed of impurities by first scrubbing with an organochlorosilane, which may be the same or different from the organochlorosilane(s) hydrolyzed, and then further scrubbing with chloromethane. The purified gaseous hydrogen chloride is preferably used in chlorosilane synthesis.
Claims11
A process for purifying contaminated gaseous hydrogen chloride containing water, organochlorosilane A and/or hydrolysis products thereof, comprising scrubbing the contaminated gaseous hydrogen chloride with a liquid organochlorosilane B to form a partially decontaminated gaseous hydrogen chloride, and after the scrubbing with organochlorosilane B, scrubbing the partially decontaminated gaseous hydrogen chloride with liquid chloromethane, wherein organochlorosilanes A and B comprise organochlorosilanes of the formula
- RaSiCl4-a (I)
- where
- the radicals R are identical or different radicals selected from among hydrogen and unsubstituted and substituted C1-C18 hydrocarbon radicals and
- a is 0, 1, 2 or 3,
- with the proviso that at least 10 mol % of the radicals R are hydrocarbon radicals.
Dependencies are inferred from the claim text.