Title:
PURIFICATION OF BISPHENOL-A
Document Type and Number:
Japanese Patent JP3934168
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To economically purify the subject compound because of no need of using any heating medium oil and of few process steps by adopting a specific process of recrystallization of bisphenol-A in its aqueous dispersion while suppressing the thermooxidative decomposition of the subject compound because of low process temperature.
SOLUTION: A crude bisphenol-A compound obtained by the condensation of phenol and acetone in the presence of an acid catalyst is first mixed with water and the bisphenol-A compound in the aqueous mixture is melted preferably at 95-100°C under the atmospheric pressure. The bisphenol-A compound is then recrystallized from the aqueous mixture and the obtained crystal is separated. Subsequently, remaining contaminants in the bisphenol-A is washed off and removed by water at ≥35°C but below the melting point of the crystal, preferably 90-155°C. The quantity of the water in the above-mentioned aqueous mixture is preferably 30-50 wt.%.
Inventors:
Gaylord Michael Kissinger
Application Number:
JP18609995A
Publication Date:
June 20, 2007
Filing Date:
July 24, 1995
Export Citation:
Assignee:
GENERAL ELECTRIC COMPANY
International Classes:
C07B63/00; C07C37/84; B01D9/00; C07B61/00; C07C37/20; C07C39/16; (IPC1-7): C07C39/16; C07C37/20; C07C37/84; //C07B61/00; C07B63/00
Domestic Patent References:
| JP2212450A | ||||
| JP63159335A | ||||
| JP57159733A | ||||
| JP3024028A | ||||
| JP5132441A |
Attorney, Agent or Firm:
Kenichi Matsumoto