Process for separation and recovery of glutaric, succinic, and adipic acids
阅读：540发布：2023-09-19
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1. A PROCESS FOR THE SEPARATION OF INDIVIDUAL DICARBOXYLIC ACIDS FROM A MIXTURE CONSISTING ESSENTIALLY OF ABOUT 12% TO 24% ADIPIC ACID, ABOUT 50, TO 74% GLUTARIC ACID, AND ABOUT 13% TO 25% SUCCINIC ACID BY WEIGHT, BASED ON ANHYDROUS ACIDS, IN WHICH THE PROPORTION OF GLUTARIC ACID IS GREATER THAN THE PROPORTION OF SUCCINIC ACID AND THE PROPORTION OF SUCCINIC ACID IS GREATGER THAN THE PROPORTION OF ADPIC ACID BY: (A) DISSOLVING THE MIXED ACIDS IN HOT WATER, COOLING, COLLECTING A PRECIPITATE, CONSISTING ESSENTIALLY OF A MIXTURE OF MORE THAN 50%, BY WEIGHT, SUCCINIC ACID, AND FROM ABOUT 20% TO ABOUT 45%, BY WEIGHT, ADIPIC ACID AND A FILTRATE CONTAINING THE BULD OF THE GLUTARIC ACID; AND (B) DISSOLVING THE PRECIPITATED MIXTURE OF SUCCINIC ACID AND ADPIC ACID IN HOT AQUEOUS NITRIC ACID HAVING A CONCENTRATION OF HNO3 IN THE RANGE OF 50% TO 70%, BY WEIGHT, COOLING, AND COLLECTING THE PRECIPITATED SUCCINIC ACID; AND (C) RECOVERING ADIPIC ACID FROM THE MOTHER LIQUOR FROM (B) BY EVAPORATION OF THE HNO3 AND CONCENTRATION OF THE AQUEOUS SOLUTION, COOLING, AND COLLECTING THE ADIPIC ACID PRECIPITATED FROM THE CONCENTRATED AQUEOUS SOLUTION.
3. A PROCESS FOR RECOVERING SUCCINIC ACID FROM A MIXTURE OF DICARBOXYLIC ACIDS CONSISTING ESSENTIALLY OF MORE THAN 50%, BY WEIGHT, SUCCINIC ACID AND FROM ABOUT 20% TO ABOUT 45%, BY WEIGHT, ADIPIC ACID, BY DISSOLVING THE MIXTURE IN HOT AQUEOUS NITRIC ACID HAVING A CONCENTRATION OF HNO3 IN THE RANGE OF 55% TO 65%, BY WEIGHT, COOLING, AND COLLECTING THE PRECIPITATED SUCCINIC ACID.
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