Patent ID: 6646097
Filing Date: 2003-11-11
Classification: C07C,C08G

Abstract:
A method for purifying 1,1-bis(4â€²-hydroxy-3â€²-methylphenyl)cyclohexane comprising:dissolving said 1,1-bis(4â€²-hydroxy-3â€²-methylphenyl)cyclohexane in a first solvent consisting essentially of an alcohol to form a first solution; filtering said first solution; adding a Slecond 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(4â€²-hydroxy-3â€²-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(4â€²-hydroxy-3â€²-methylphenyl)cyclohexane from said third solution to produce a second crystalline product.