| 摘要 |
A METHOD FOR REMOVING IMPURITIES FROM A MOTHER LIQUOR (301) COMPRISING A CARBOXYLIC ACID, A METAL CATALYST, IMPURITIES BY (A) EVAPORATING THE MOTHER LIQUOR (301) COMPRISING A CARBOXYLIC ACID, A METAL CATALYST, IMPURITIES AND A SOLVENT IN A FIRST EVAPORATOR ZONE (321) TO PRODUCE A VAPOR STREAM (304) AND A CONCENTRATED MOTHER LIQUOR STREAM (305); (B) EVAPORATING THE CONCENTRATED MOTHER LIQUOR STREAM (305) IN A SECOND EVAPORATOR ZONE (350) TO FORM A SOLVENT RICH STREAM (344) AND A SUPER CONCENTRATED MOTHER LIQUOR STREAM (345); (C) MIXING IN A MIXING ZONE (348) A WATER-SOLVENT SOLUTION (306) AND OPTIONALLY AN EXTRACTION SOLVENT (311) WITH THE SUPER CONCENTRATED MOTHER LIQUOR STREAM (305) TO FORM AN AQUEOUS MIXTURE (307); (D) OPTIONALLY SEPARATING ORGANIC IMPURITIES (312) FROM THE AQUEOUS MIXTURE (307) IN A SOLID-LIQUID SEPARATION ZONE (351) TO FORM A PURIFIED AQUEOUS MIXTURE (308); AND (E) EXTRACTING THE AQUEOUS MIXTURE (307) OR PURIFIED AQUEOUS MIXTURE (308) WITH AN EXTRACTION SOLVENT (311) IN AN EXTRACTION ZONE (323) TO FORM AN EXTRACT STREAM (309) AND THE RAFFINATE STREAM (310). |
