PROCESS FOR THE PREPARATION OF 4,4'-DIHYDROXYDIPHENYL ETHER

摘要

The invention relates to a process for the preparation of 4,4'-dihydroxydiphenyl ether by dehydration of hydroquinone using sulfonic acids or sulfuric acid as catalysts at elevated temperatures. The dehydration product is stirred with an excess of water at 80 to 110.degree.C. The higher condensed byproducts which are undissolved during this are separated off, and the ether desired is allowed to crystaltize out of the filtrate obtained.