Purification of crude, liquid organosulfonyl chloride

Claim 1

A method of purifying a crude liquid organosulfonyl chloride product recovered from its manufacturing process or otherwise similarly contaminated which comprises first subjecting said crude product to scrubbing with a clean, aqueous hydrochloric acid solution having an acid concentration of at least about 18%, based on the weight of the solution, for a time sufficient to extract organosulfonic acid, separating the scrubbed product from the hydrochloric acid solution, and then stripping said scrubbed product at a temperature no greater than about 70° C. and under subatmospheric pressure of no greater than about 500 torr while an inert gas is caused to sweep the volatiles issuing from the organosulfonyl chloride being stripped, and thereafter recovering a purified organosulfonyl chloride product.

Claim 2

A method of purifying a crude liquid organosulfonyl chloride product recovered from its manufacturing process or otherwise similarly contaminated which comprises first subjecting said crude product to scrubbing with a clean, aqueous hydrochloric acid solution having an acid concentration of at least about 18%, based on the weight of the solution, for a time sufficient to extract organosulfonic acid, separating the scrubbed product from the hydrochloric acid solution, and then stripping said scrubbed product at a temperature no greater than about 70° C. and under subatmospheric pressure of no greater than about 500 torr while an inert gas is caused to sweep the volatiles issuing from the organosulfonyl chloride being stripped, and thereafter recovering a purified organosulfonyl chloride product.

Claim 11

A method of purifying crude methane sulfonyl chloride product which comprises first scrubbing said crude product with a clean aqueous solution of hydrochloric acid at an acid concentration of from about 30 to about 36%, based on the weight of the solution, for about 3 to about 15 minutes, decanting the scrubbed methane sulfonyl chloride from the hydrochloric acid solution and subjecting the methane sulfonyl chloride to stripping at a temperature between about 40° and about 60° C. under a total pressure of no greater than 350 torr while sweeping the volatiles issuing from the methane sulfonyl chloride being stripped with an inert gas flowing at a rate no less than 1.0 unit volume per minute per unit volume of organosulfonyl chloride and providing a partial pressure of less than 350 torr.

Claim 12

A method of purifying crude methane sulfonyl chloride product which comprises first scrubbing said crude product with a clean aqueous solution of hydrochloric acid at an acid concentration of from about 30 to about 36%, based on the weight of the solution, for about 3 to about 15 minutes, decanting the scrubbed methane sulfonyl chloride from the hydrochloric acid solution and subjecting the methane sulfonyl chloride to stripping at a temperature between about 40° and about 60° C. under a total pressure of no greater than 350 torr while sweeping the volatiles issuing from the methane sulfonyl chloride being stripped with an inert gas flowing at a rate no less than 1.0 unit volume per minute per unit volume of organosulfonyl chloride and providing a partial pressure of less than 350 torr.