Process for the purification of dihydric phenols

US7541417B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Sunil Ashtekar · Savanuru, IN
• Mahesh Malusare · Bengaluru, IN
• Gurram Kishan · Bengaluru, IN
• Pushpa Narayanan · Savanuru, IN
• Ramanarayanan GV · Savanuru, IN
• Arun Dixit · Savanuru, IN
• Pradeep Nadkarni · Bengaluru, IN
• Jan Plen Lens · Breda, NL

Key dates

• Filing date: Mar 30, 2006
• Grant date: Jun 2, 2009
• Expiry date: Jan 2, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/685
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, filtering the adsorbent material to form a solution B, adding an anti-solvent to the solution B to form a solution C, and distilling the solution C, wherein the dihydric phenol is represented by Formula (I):wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value of 1 to 4.