申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:US04146730A1
公开(公告)日:1979-03-27
A method for obtaining glutaric acid, succinic acid, and adipic acid from an acid mixture obtained as a by-product in the industry and comprising glutaric acid, succinic acid and adipic acid, which comprises the steps of: (1) contacting the acid mixture with urea of 1 to 2 moles per mole of the acid mixture, in solution, to deposit a urea-glutaric acid adduct so that the weight ratio of glutaric acid remaining in the solution to succinic acid is 1.2 or less when the adipic acid content is in the range of 0% by weight to 7% by weight and 1.4 or less when the adipic acid content is larger than 7% by weight and 30% by weight or less; separating the deposited urea-glutaric acid adduct out of the solution; (2) adding further urea to the solution and/or concentrating the solution obtained in the step (1) to deposit a urea-succinic acid adduct; separating the deposited urea-succinic acid adduct out of the solution; and (3) decomposing the separated urea-dicarboxylic acid adducts each into respective dicarboxylic acids and urea. With this method, the mixture comprising glutaric acid, succinic acid and adipic acid can, for the first time, be successfully and effectively separated into the respective components.
从工业副产物中获取戊二酸、琥珀酸和己二酸的方法,该副产物包含戊二酸、琥珀酸和己二酸,包括以下步骤:(1)将含有1至2摩尔尿素的溶液与该酸混合物接触,以沉淀尿素-戊二酸加合物,使得当己二酸含量在0%至7%时,剩余在溶液中的戊二酸与琥珀酸的重量比为1.2或以下,当己二酸含量大于7%且小于等于30%时,重量比为1.4或以下;将沉淀的尿素-戊二酸加合物从溶液中分离出来;(2)向溶液中添加更多的尿素和/或浓缩步骤(1)中得到的溶液,以沉淀尿素-琥珀酸加合物;将沉淀的尿素-琥珀酸加合物从溶液中分离出来;(3)将分离出的尿素-二羧酸加合物分解成相应的二羧酸和尿素。使用这种方法,首次可以成功有效地将含有戊二酸、琥珀酸和己二酸的混合物分离成各自的组分。