Process for producing bisphenol-A

US7696388B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Hatem Abdallah Belfadhel · Roosendaal, NL
• Umesh Krishna Hasyagar · Savanuru, IN
• Gurram Kishan · Bengaluru, IN
• Rathinam Jothi Mahalingam · Savanuru, IN

Key dates

• Filing date: Jul 9, 2008
• Grant date: Apr 13, 2010
• Expiry date: Jul 9, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/86
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing 2,2-bis(4-hydroxyphenyl)propane (p,p-bisphenol-A) from 2,4,4-trimethyl-2-(4-hydroxyphenyl)chroman (chroman 1.5) is disclosed. Phenol and chroman 1.5 are contacted over an acidic ion exchange resin at a given temperature for a given period of time. The process results in improved quality of p,p-bisphenol-A, better performance of catalyst, improved raw material usage, and reduced waste.