Process for purifying alkanesulfonic anhydride and process for producing alkanesulfonic acid using the purified alkanesulfonic anhydride

US10730827B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Juergen Wortmann · Ludwigshafen, DE
• Jan SPIELMANN · Mannheim, DE
• Katharina FEDERSEL · Heidelberg, DE
• Feelly Ruether · Ludwigshafen, DE

Key dates

• Filing date: Apr 18, 2018
• Grant date: Aug 4, 2020
• Expiry date: Apr 18, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for purifying alkanesulfonic anhydride that includes feeding a stream containing alkanesulfonic anhydride, sulfuric acid, high boilers and residual low boilers into a melt crystallization to form crystals of the alkanesulfonic anhydride suspended in mother liquor, and solid-liquid separation to remove the crystals from the mother liquor.