Process for the preparation of pure dehydroacetic acid

Details Process for the preparation of pure dehydroacetic acid Process for the preparation of pure dehydroacetic acid

1974-01-25

1976-02-03

Yudkoff, Norman

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

203 91, 203 41, 2603435, B01D 1500

Patent

active

039363597

ABSTRACT:
A process is disclosed for the purification of crude dehydroacetic acid by means of simple vacuum or reduced pressure distillation wherein activated charcoal is added to the still. The term reduced pressure is used in the sense that it excludes complicated distillations such as fractional distillation and it is synonymous with simple vacuum distillation. Preferably a pressure of about 10 to about 20 torr is maintained in the vacuum distillation still. Preferably, 0.1 to 1 percent by weight, relative to the total amount of the crude dehydroacetic acid, of activated charcoal is added to the still before the distillation occurs. Crude dehydroacetic acid, particularly that obtained from diketene, is quite impure and discolored. The process of this invention produces a pure dehydroacetic acid, which is pure white, has a transparency of 96 percent and which has a purity of greater than 99.9 percent. Data shows that when distillation is affected without activated charcoal the transparency of the resultant product is less than the crude starting material. The very pure dehydroacetic acid obtained by the process of this invention is useful as a food preservative.

REFERENCES:
patent: 2013104 (1935-09-01), Macallum
patent: 2997482 (1961-08-01), Craven
"Unit Operations", Brown (Wiley & Sons Inc.), N.Y., 1951, pp. 398 & 399.
"Chemical Engineering Techniques", Laver, Reinhold Publishing Co., N.Y., 1952, pp. 412 & 413.

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