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US 5,292,947 AGranted
Process for preparing alkylsulfonic anhydrides
AssigneeEastman Kodak Company
InventorTheodore R. Walker, Jr.
Life of this patent
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Abstract
This invention relates to a process for preparing an alkylsulfonic anhydride comprising contacting (A) a dehydrated phosphoric acid with (B) an alkylsulfonic acid having 1 to 6 carbon atoms, under conditions of temperature and pressure to result in the substituted absence of phosphoric/alkylsulfonic mixed anhydride and production of a mixture of alkylsulfonic acid and its corresponding anhydride at a conversion of at least 10% of alkylsulfonic acid to the corresponding alkylsulfonic anhydride.
Claims10
A process for preparing an alkylsulfonic anhydride comprising
- contacting
- (A) a dehydrated phosphoric acid with
- (B) an alkylsulfonic acid having 1 to 6 carbon atoms,
- under conditions of temperature from about 180.degree. C. to about 300.degree. C. and press less than 20 mm Hg to result in the absence of phosphoric/alkylsulfonic mixed anhydride and production of a mixture of alkylsulfonic acid and its corresponding anhydride at a conversion of at least 10% of said alkylsulfonic acid to the corresponding alkylsulfonic anhydride.
1 more element
A process comprising:
- (I) heating phosphoric acid at about 180.degree. to about 300.degree. for about 20 to about 300 minutes and removing water produced by vacuum distillation to form dehydrated phosphoric acid;
- (II) contacting
- (A) dehydrated phosphoric acid produced from step (I) with
- (B) an alkylsulfonic acid having 1 to 6 carbon atoms,
- under conditions of temperature and pressure to result in the absence of phosphoric/alkylsulfonic mixed anhydride and production of a mixture of alkylsulfonic acid and its corresponding anhydride at a conversion of at least 10% of said alkylsulfonic acid to the corresponding alkylsulfonic anhydride, and
- (III) separating the mixture of alkylsulfonic acid and its corresponding anhydride from phosphoric acid by distillation.
3 more elements
Dependencies are inferred from the claim text.