Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1976-12-15
1979-03-27
Garner, Vivian
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562530, 562543, 562593, C07C 5142
Patent
active
041467302
ABSTRACT:
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.
REFERENCES:
patent: 2569984 (1951-10-01), Fetterly
patent: 2588602 (1952-03-01), Adams et al.
Fukuoka Yohei
Nishikido Joji
Tamura Nobuhiro
Asahi Kasei Kogyo Kabushiki Kaisha
Garner Vivian
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