Improved process for reacting salts of D,L-tartaric and maleic a

Details Improved process for reacting salts of D,L-tartaric and maleic a Improved process for reacting salts of D,L-tartaric and maleic a

1988-08-24

1989-09-19

Lieberman, Paul

Compositions

Water-softening or purifying or scale-inhibiting agents

Plant or organic material containing

25217419, 252DIG11, 260701, 562583, C07C 5143, C07C 5524, C07C 59245, C11D 320

Patent

active

048679011

ABSTRACT:
There is disclosed herein improved processes for the preparation of mixtures of alkali metal salts of 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylate and alkali metal salts of 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylate wherein D,L-tartaric acid is employed and recovered by lowering the pH of the reaction medium to within the range of from about 7 to about 9.5. At the reduced pH calcium D,L-tartrate precipitates and is easily separated. The recovered tartrate may be recycled to the synthesis reaction to prepare further product.

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patent: 4654159 (1987-03-01), Bush et al.
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patent: 4689167 (1987-08-01), Collins et al.
Chemical Abstracts, vol. 60, 2295G, 1964.
Chemical Abstracts, vol. 64, 4224G, 1966.

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