Patent ID: 6342641
Filing Date: 2002-01-29
Classification: C07C,C08G

Abstract:
A method of producing a bisphenol A ethoxylate comprising the sequential steps of(a) reacting ethylene oxide with bisphenol A in the presence of a base catalyst to produce a bisphenol A ethoxylate; (b) neutralizing said bisphenol A ethoxylate with a mineral acid; (c) heating said neutralized bisphenol A ethoxylate to remove substantially all of the residual water; (d) circulating the neutralized bisphenol A ethoxylate through a filter to remove insoluble salts; (e) adding a metal silicate to said neutralized, filtered bisphenol A ethoxylate of step â€œdâ€ ; and (f) refiltering to remove the metal silicate and absorbed catalyst.