Method for purifying 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane and methods of producing polycarbonates therefrom

US6646097B1 · kind B1 · utility

Assignee

• General Electric Company · US

Inventors

• Ashok Shyadligeri · Bengaluru, IN
• Gary Charles Davis · Albany, US
• Debjani Kapila · Bengaluru, IN
• Ramesh Krishnamurti · Williamsville, US
• A. Radhakrishna · Bengaluru, IN
• Veeraraghavan Srinivasan · Bengaluru, IN

Key dates

• Filing date: Oct 31, 2002
• Grant date: Nov 11, 2003
• Expiry date: Oct 31, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for purifying 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane comprises dissolving said 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane in a first solvent consisting essentially of an alcohol to form a first solution; filtering said first solution; adding a second solvent consisting essentially of water to the filtered first solution to form a second solution, wherein said second solution comprises about 40 parts to about 95 parts of the first solvent per 100 parts of the combined weight of the first and second solvents; crystallizing said 1,1-bis(4′-hydroxy-3′-methylphenyl) cyclohexane from said second solution to form a first crystalline product; dissolving said first crystalline product in a third solvent to form a third solution, wherein the third solvent comprises an aromatic compound; and crystallizing said 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane from said third solution to produce a second crystalline product.