Processes for preparing 4-chlorobenzenesulfonic acid and 4,4′-dichlorodiphenyl sulfone

US8853444B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Patrick Deck · Mannheim, DE
• Heiner Schelling · Ludwigshafen, DE
• Florian Garlichs · Neustadt, DE

Key dates

• Filing date: Mar 7, 2011
• Grant date: Oct 7, 2014
• Expiry date: Jan 24, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C315/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Processes for preparing 4-chlorobenzenesulfonic acid from 2-chlorobenzenesulfonic acid and/or 3-chlorobenzenesulfonic acid, which processes include the conversion of 2-chlorobenzenesulfonic acid and/or 3-chlorobenzenesulfonic acid to 4-chlorobenzenesulfonic acid in the presence of sulfuric acid at a temperature of 100 to 300° C.; as well as processes for preparing 4,4′-dichlorodiphenyl sulfone, which include such described processes for preparing 4-chlorobenzenesulfonic acid.