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US 6,495,714 B1Granted
Method for producing alkanesulfonic acids
AssigneeBASF SE
InventorsKlaus Halbritter, Hans-Josef Sterzel, Matthias Eiermann, Eva Freudenthaler
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Abstract
A process for preparing alkanesulfonic acids from dialkyl sulfites comprises the following steps: rearrangement of dialkyl sulfite in the presence of a suitable catalyst to form the corresponding alkyl alkanesulfonate and hydrolysis of the resulting alkyl alkanesulfonate to give the corresponding alkanesulfonic acid.
Claims21
A process for preparing an alkanesulfonic acid, which comprises the following steps:
- (a) reacting an epoxide with sulfur dioxide to form alkylene sulfite,
- (b) countercurrently contacting the alkylene sulfite continuously with an alcohol to form dialkyl sulfite and a corresponding diol,
- (c) rearranging the dialkyl sulfite in the presence of one or more catalysts selected from the group consisting of an amine, an alkyl iodide, a quaternary ammonium salt, a quaternary phosphonium salt, a tertiary sulfonium salt, and an alkylating agent, to form a corresponding alkyl alkanesulfonate,
- (d) hydrolyzing the alkyl alkanesulfonate to give a alkanesulfonic acid.
1 more element
Dependencies are inferred from the claim text.