| 摘要 |
A PROCESS FOR THE RECOVERY OF ACRYLONITRILE OR METHACRYLONITRILE FROM AN AQUEOUS SOLUTION COMPRISING SUBJECTING THE SAID SOLUTION TO A WATER EXTRACTIVE DISTILLATION BY FEEDING THE SOLUTION TO A DISTILLATION COLUMN AND PERFORMING SAID EXTRACTIVE DISTILLATION AND USING SOLVENT WATER INTRODUCED AT THE TOP OF SAID COLUMN, REMOVING A FIRST OVERHEAD VAPOR STREAM OF ACRYLONITRILE OR METHACRYLONITRILE WITH SOME WATER FROM THE TOP OF THE COLUMN, AND A FIRST LIQUID STREAM CONTAINING WATER AND IMPURITIES FROM THE BOTTOM OF THE COLUMN, THE CONTENTS OF SAID COLUMN MAINTAINED AT A SUBSTANTIALLY NEUTRAL PH BY ADDING A SUFFICIENT AMOUNT OF AT LEAST ONE ALKALINE COMPOUND SELECTED FROM AMMONIUM CARBONATE, AMMONIUM BICARBONATE, AMMONIUM CARBAMATE, AND ALKYLENE DIAMINES TO THE OVERHEAD DECANTER AND/OR TO THE SOLVENT WATER.
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