Process for preparing solid betaines

Details Process for preparing solid betaines Process for preparing solid betaines

1991-07-01

1992-04-14

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

560156, 560170, 562443, 562444, 562553, 562567, C07C22900

Patent

active

051050080

ABSTRACT:
Betaines are produced in solid form by reacting a tert-amine with an alkyl haloalkanoate and hydrolyzing the resultant quaternary ammonium ester when the tert-amine/alkyl haloalkanoate reaction is conducted in a liquefied gas as the solvent and the hydrolysis is conducted in a liquefied gas solvent or a polar aprotic solvent in which the betaine is substantially insoluble. In a preferred embodiment, the tert-amine is an N-alkyldimethylamine, the haloalkanoate is ethyl chloroacetate, and the liquefied gas is carbon dioxide.

REFERENCES:
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patent: 3954845 (1976-05-01), Martinsson
patent: 4832871 (1989-05-01), Bade
Nandakumar, "Journal of the Oil Technologists' Association of India," vol. 11(2), pp. 31-34 (1979).

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