Process for isolating hydroxypivalic acid from aqueous solution

Details Process for isolating hydroxypivalic acid from aqueous solution Process for isolating hydroxypivalic acid from aqueous solution

1997-08-05

1999-01-12

Geist, Gary

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

058592962

ABSTRACT:
Hydroxypivalic acid is obtained from aqueous solutions by removal of the water by azeotropic distillation and subsequent crystallization from a solvent mixture which is composed of a polar and a non-polar component. The distillation is carried out under reduced pressure and at a maximum bottom temperature of 90.degree. C., until a residual water content of at least 0.1% of the total weight of the resulting solution is achieved.

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H.P. Frank, et al., Uher die Herstellung von Hydroxypivalinsaure und deren Polyester, Monatshefte fur Chemie, 95, pp. 410-414, (1964).
H. Frank, et al., "Preparation of Hydroxypivalic Acid and Its Polyesters", Monatsh., 95, (2), 410-14, (1964), (abstract only from CA 61,12099).
F. Nerdel, et al., Zur Bildung eines 2-Alkoxy-azetidins, Chem. Ber. 102,(5) pp. 1606-1609, (1969).
E.T. Stiller, et al., Panthothenic Acid. VIII. The Total Synthesis of Pure Pantothenic Acid, vol. 62, pp. 1785-1790, (Jul. 1940).

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