IMPROVED MANUFACTURING PROCESS FOR DIHYDROXYDIPHENYLMETHANE WITH HIGH SELECTIVITY FOR 2,4'- DIHYDROXYDIPHENYLMETHANE

摘要

The invention relates to an improved manufacturing process for the preparation of high 2, 4′-dihydroxydiphenylmethane, by a process involving reaction of phenol and formaldehyde, in the presence of an inorganic polyprotic acid. According to this process, the reaction conditions are selected to favour a high yield of dihydroxydiphenylmethane, with a relatively high concentration of the 2,4′-isomer, by using a relatively low molar excess of phenol than conventional methods.