| 摘要 |
A process which comprises (a) contacting an excess of a phenol with a ketone in the presence of an acidic ion exchange resin catalyst; (b) recovering thereafter a stream from the acidic ion exchange resin catalyst including the dihydric phenol, unreacted phenol, isomers of the desired dihydric phenol and acid impurities derived from the acidic ion exchange resin catalyst; (c) removing a major portion of the desired dihydric phenol from the stream of (b); (d) separating the stream including phenol, a small portion of the desired dihydric phenol, isomers of the desired dihydric phenol, and acidic impurities derived from the acidic ion exchange resin catalyst into a major stream and a minor stream by volume; (e) recycling the major stream so as to contact the acidic ion exchange resin catalyst of (a) together with new phenol and ketone so as to maintain a balance between the color of the final desired dihydric phenol product and impurities found therein; (f) recovering from the small stream desirable dihydric phenol, and (g) introducing into the minor stream created at step (d) sufficient quantities of a Group II a metal or transition metal of oxidation number +2 carbonate to effectively neutralize the acidic impurities derived from the acidic ion exchange resin catalyst. ) |
