Production method of pyrrolidone carboxylic acid and salt...

Details Production method of pyrrolidone carboxylic acid and salt... Production method of pyrrolidone carboxylic acid and salt...

2006-04-04

2006-04-04

McKane, Joseph K. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07022863

ABSTRACT:
The present invention provides a production method of pyrrolidone carboxylic acid or a salt thereof, which includes bringing glutamic acid or a salt thereof into contact with high-temperature high-pressure water having a temperature of above 100° C. and not higher than 300° C., and a pressure higher than the vapor pressure of water at this temperature. The present invention affords efficient production and supply of pyrrolidone carboxylic acid or a salt thereof from glutamic acid or a salt there.

REFERENCES:
patent: 3235563 (1966-02-01), Noyori et al.
patent: 4946968 (1990-08-01), Krimmer et al.
patent: 834650 (1960-05-01), None
patent: 1006728 (1965-10-01), None
patent: 51110559 (1976-09-01), None
patent: 11-342379 (1999-12-01), None
English abstract of Journal of the Serbian Chemical Society, vol. 54(1), pp. 11-15 (1989).
English abstract of Zhejiang Gongye Daxue Xuebao, vol. 27(1), pp. 28-33 (1999).

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