Process for the preparation of pure aqueous betaine solutions

Details Process for the preparation of pure aqueous betaine solutions Process for the preparation of pure aqueous betaine solutions

1993-09-13

1994-12-06

Dees, Jose G.

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

Organic compounds

Fatty compounds having an acid moiety which contains the...

554 52, 554 59, 554 41, 554 68, 554 69, 562575, C07C231100

Patent

active

053712501

ABSTRACT:
The process described relates to the preparation of aqueous betaine solutions by reaction of a tertiary amine with an .omega.-monohalocarboxylic acid, preferably monochloroacetic acid, and an alkali metal hydroxide in the presence of water, which solutions are said to be highly pure particularly in respect of the tertiary starting amine and .omega.-monohalocarboxylic acid. This is achieved by first reacting the three reaction components in a certain molar ratio with the aim of obtaining a betaine solution which comprises only a tolerated amount of starting amine. This aqueous betaine solution is then treated with a sulfonating agent, preferably with an alkali metal sulfite, alkali metal pyrosulfite or alkali metal bisulfite, for conversion of the .omega.-monohalocarboxylic acid present into the corresponding sulfocarboxylic acid, which is not troublesome. The process described is simple to carry out and leads to the highly pure aqueous betaine solutions mentioned.

REFERENCES:
patent: 3819539 (1974-06-01), Bloch et al.
patent: 4497825 (1985-02-01), Bade
patent: 5075498 (1991-12-01), Perine et al.
patent: 5239095 (1993-08-01), Bade

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