| 摘要 |
PURPOSE:To easily obtain the above compound having high purity in colorless state while preventing the contamination caused by the corrosion of apparatus, by reacting phenol with acetone in the presence of an acid catalyst, removing the acid catalyst from the reaction product and treating the product with a specific ion exchange resin. CONSTITUTION:Phenol and acetone are subjected to condensation reaction at a molar ratio of 4-12 in the presence of an acid catalyst such as hydrochloric acid or strongly acidic cation exchange resin at 40-100 deg.C. When the acid catalyst is hydrochloric acid, the reaction product is distilled under reduced pressure (preferably 20-200mmHg) at 90-120 deg.C to remove the acid catalyst. The obtained liquid mixture having an acid concentration of 0-2 equivalent/ TON is treated with a weakly basic ion exchange resin having pyridyl group as exchange group (e.g., KEX-212, product of Koei Chem. Ind.) preferably at 70-150 deg.C for 5-60min to prevent the decomposition in high-temperature distillation process. The objective compound useful as a raw material for polycarbonate resin, epoxy resin and engineering plastics, etc., can be easily produced by this process.
|
