Process for producing a polyoxyalkylenecarboxylic acid

Details Process for producing a polyoxyalkylenecarboxylic acid Process for producing a polyoxyalkylenecarboxylic acid

1997-08-27

1998-11-24

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 591245

Patent

active

058409734

ABSTRACT:
A process for producing a polyoxyalkylenecarboxylic acid which comprises: (A) a step of obtaining a salt of a polyoxyalkylenecarboxylic acid by reacting a polyoxyalkylene compound having hydroxyl group at one or both ends of the molecule with a salt of a halogenated acetic acid or a salt of a halogenated propionic acid in an amount of 4 to 50 mol per 1 mol of the polyoxyalkylene compound and an alkali metal hydroxide in an amount of 8 to 70 mol per 1 mol of the polyoxyalkylene compound in the presence of an organic solvent at 80.degree. to 150.degree. C.; (B) a step of converting the obtained salt of a polyoxyalkylenecarboxylic acid into the polyoxyalkylenecarboxylic acid by adjusting pH of the reaction mixture obtained in step (A) to 3 or less by adding an inorganic acid; (C) a step of removing byproducts and the like by washing the obtained solution containing the polyoxyalkylenecarboxylic acid with an aqueous solution of an inorganic salt; and (D) a step of removing the organic solvent and water at a decreased pressure at 50.degree. to 120.degree. C. and removing precipitated salts by filtration. A high purity, high molecular weight polyoxyalkylenecarboxylic acid which contains only small amounts of unreacted starting materials or byproducts can easily be obtained.

REFERENCES:
patent: 4002676 (1977-01-01), Borggrefe
patent: 4219672 (1980-08-01), Borggrefe

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