| 摘要 |
AN IMPROVED PROCESS FOR AZEOTROPIC DISTILLATION OF A FEEDSTOCK IN WHICH THE FEEDSTOCK COMPRISESAN ALIPHATIC CARBOXYLIC ACID, WATER AND AN ESTER IMPURITY DERIVED FROM SAID ALIPHATIC CARBOXYLIC,WHEREIN THE IMPROVEMENT COMPRISES A) CONDUCTING THE AZEOTROPIC DISTILLATION IN THE PRESENCE OF ANORGANIC ENTRAINER TO PRODUCE A LIQUID PHASE COMPONENT COMPRISING SAID ALIPHATIC CARBOXYLIC ACIDHAVING A REDUCED WATER CONTENT RELATIVE TO THE WATER CONTENT IN THE FEEDSTOCK AND A VAPOR PHASECOMPONENT WHICH CONTAINS THE ORGANIC ENTRAINER, WATER AND SAID ESTER IMPURITY;B) CONDENSING THEVAPOR PHASE COMPONENT UNDER CONDITIONS WHEREBY THE ORGANIC ENTRAINER AND WATER CONDENSE ANDA SUBSTANTIAL PORTION OF THE ESTER IMPURITY REMAINS IN THE VAPOR PHASE;C) RECOVERING THE ESTERIMPURITY IN THE VAPOR PHASE; D) SEPARATING THE ORGANIC ENTRAINER AND WATER CONDENSATE FROM STEP(B) INTO AN ORGANIC PHASE AND AN AQUEOUS PHASE; AND (E) RETURNING THE ORGANIC PHASE TO THEDISTILLATION COLUMN.(FIG 1)
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