Method for separating ammonium sulfate and ammonium bisulfate fr

Details Method for separating ammonium sulfate and ammonium bisulfate fr Method for separating ammonium sulfate and ammonium bisulfate fr

1998-03-02

1999-10-26

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562581, C07C 5116, C07C31500

Patent

active

059731982

ABSTRACT:
A process for producing 2-hydroxy-4-methylthiobutanoic acid which includes conducting hydration and successive hydrolysis of 2-hydroxy-4-methylthiobutyronitrile in a reaction system containing 2-hydroxy-4-methylthiobutyronitrile and sulfuric acid, ammonium bisulfate being added to the reaction system at the time of the hydration and/or the hydrolysis, acquiring 2-hydroxy-4-methylthiobutanoic acid from the resulting organic layer, adding a water-miscible organic solvent to the by-produced aqueous layer to deposit ammonium sulfate, and separating and removing the ammonium sulfate from ammonium bisulfate, thereby permitting recycling and reusing of ammonium bisulfate, reduces the amount of sulfuric acid used, produces substantially no waste water containing sulfates and is of a low production cost and environmentally friendly.

REFERENCES:
patent: 3709666 (1973-01-01), Van Westerveld
patent: 3902859 (1975-09-01), Greco
patent: 4524077 (1985-06-01), Ruest et al.
patent: 4912257 (1990-03-01), Hernandez et al.
patent: 5498790 (1996-03-01), Grendel et al.
Database WPI, Section Ch, Week 7720, Derwent Publications, Class C04, An 77-35465Y Oct. 6, 1975.
Patent Abstract of Japan, Publication No. 08157447, Matsuoka Kazuyuki, Production of 2-Hydroxymethylmercaptobutyric Acid Jun. 18, 1996.

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