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Separation of adipic acid, glutaric acid and succinic acid from mother liquors obtained in the manufacture of adipic acid

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1. A PROCESS FOR TREATING IS SUBSTANTIALLY DRY AND NITRIC ACID FREE MIXTURE OF SUCCINIC ACID, GLUTARIC ACID, AND ALIPIC ACID WHICH COMPRISES THE STEPS OF ADMIXING WITH SAID MIXTURE AN INERT PARAFFINIC HYDROCARBON HAVING A BOILING POINT OF 200-275*C. AND CAPABLE OF FORMING A MINIMUM CONSTANT BOILING HETEROGENEOUS MIXTURE WITH SUCCINIC ANHYDRIDE, HEATING THE RESULTING ADMIXTURE AT A BASE TEMPERATURE OF 180-175*C. TO DEHYDRATE THE SUCCINIC ACID TO SUCCINIC ANHYDRIDE, DISTILLING THE RESULTING HETEROGENEOUS AZEOTROPE OF SAID HYDROCARBON AND SUCCINIC ANHYDRIDE TOGETHER WITH THE WATER OF DEHYDRATION, AND RECOVERING THE SUCCINIC ANHYDRIDE FROM THE MAKE OF THE DISTILLATION.
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