Patent ID: 6492566
Filing Date: 2002-12-10
Classification: C07C

Abstract:
An improved process for the preparation of dihydroxydiphenylmethanes which comprises reacting phenol over a microporous alumino-silicate zeolite catalyst composite material selected from the group consisting of zeolite H-beta, H-SM12 and MCM-22, in the presence of a condensing agent wherein the condensing agent is selected from the group consisting of aqueous formaldehyde, paraformaldehyde and trioxane and a solvent selected from the group consisting of alcohol, aromatic or aliphatic hydrocarbons, ketones, chloroaromatic and nitroaromatic compounds at a temperature in the range of 5 to 200Â° C. for a period between 0.1 to 24 hours at autogeneous pressure and separating the dihydroxydiphenylmethanes by any conventional method.