Process for making malate salts and thereby, amlic acid or 2,2'-

Details Process for making malate salts and thereby, amlic acid or 2,2'- Process for making malate salts and thereby, amlic acid or 2,2'-

1987-12-10

1994-03-29

Dees, Jose G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562582, C07D30702, C07C 59245

Patent

active

052986349

ABSTRACT:
Near-quantitative conversion of maleate to D,L-malate is rapidly secured by heating an aqueous alkaline mixture of maleate and excess of the divalent cations calcium, magnesium or mixtures thereof in a reactor at autogenous pressures and at temperatures above reflux. The simplest raw materials for the process are maleic anhydride and calcium hydroxide. The product is secured as an unusual, typically granular solid form of the divalent metal malate salt which is very useful in processes for preparing other malate salts, malic acid, or 2,2'-oxodisuccinate laundry detergent builders.

REFERENCES:
patent: 3128287 (1964-04-01), Berg
patent: 3635830 (1972-01-01), Lamberti
CA 101:6267t-Chemical Abstracts (1984).
F. Lloydl, Annalen, vol. 192, pp. 80-89 (1878).
Kirk-Othmer Encyclopaedia of Chemical Technology, 3rd. Ed., vol. 13, pp. 103-121 (1981); Article entitled "Hydroxy Dicarboxylic Acids".
Erickson and Alberty, J. Phys. Chem., vol. 63, pp. 705-709 (1959).
Rozelle and Alberty, J. Phys. Chem., vol. 61, pp. 1637-1640 (1957).
Bender and Connors, J. Amer. Chem. Soc., vol. 84, pp. 1980-1986 (1962).

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