Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the

Details Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the

1996-05-20

1997-06-17

Richter, Johann

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

Organic compounds

Phosphorus acids or salts thereof

C07F 938

Patent

active

056399090

ABSTRACT:
This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.

REFERENCES:
patent: 3886204 (1975-05-01), Geffers et al.
patent: 3886205 (1975-05-01), Geffers et al.
patent: 4931586 (1990-06-01), Kleinstruck et al.
A.N. Pudovik, Bull. Acad. Sci. USSR, Classe, Sci Chem. pp. 821-824 (1952).

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