| 摘要 |
PCT No. PCT/JP88/00813 Sec. 371 Date Apr. 10, 1989 Sec. 102(e) Date Apr. 10, 1989 PCT Filed Aug. 17, 1988 PCT Pub. No. WO89/01469 PCT Pub. Date Feb. 23, 1989.The invention provides a process for purifying crude 4,4'-dihydroxydiphenylsulfone characterized by dissolving the crude 4,4'-dihydroxydiphenylsulfone in an aqueous solution of a basic substance, precipitating a mono-salt of 4,4'-dihydroxydiphenylsulfone from the resulting solution by salting out, separating the salt off and subsequently treating the salt with an acid, and also porovides a process for preparing a mono-salt of 4,4'-dihydroxydiphenylsulfone characterized by dissolving crude 4,4'-dihydroxydiphenylsulfone in an aqueous solution of a basic substance, precipitating a mono-salt of 4,4'-dihydroxydiphenylsulfone from the resulting solution by salting out, and separating the salt off.
|
