Selectively separating oxalic, tartaric, glyoxylic and erythroni

Details Selectively separating oxalic, tartaric, glyoxylic and erythroni Selectively separating oxalic, tartaric, glyoxylic and erythroni

1975-11-05

1976-12-21

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260526R, 260535R, 260538, C07C 5914

Patent

active

039988783

ABSTRACT:
Mixtures of oxalic, meso tartaric, glyoxylic and erythronic acids derived particularly from the oxidation of cellulose derivatives are separated from aqueous solutions in which they are contained and from each other by stepwise precipitation with calcium ion at controlled pH. The oxalic acid is precipitated as calcium oxalate at a pH of 0.9 to 2.0; the tartaric acid as calcium meso tartrate at a pH of 2.8 to 4.4; and the glyoxylic acid, as calcium glyoxylate at a pH of 4.5 to 5.4. After each precipitation the water insoluble precipitate is separated from the aqueous mixture in which it is contained. The relatively soluble erythronic acid remains in solution as a free acid, or in the form of its calcium salt.

REFERENCES:
patent: 2470841 (1949-05-01), Barch
patent: 2813121 (1957-11-01), Makay
patent: 3872166 (1975-03-01), Spaenig et al.

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