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US 5,510,006 AGranted
Process for separation of vanillin by means of azeotropic distillation with dibenzyl ether
AssigneeInternational Flavors & Fragrances Inc.
InventorsThomas Jones, Jeffrey L. Finnan, Joseph Arvizzigno
Life of this patent
Estimating the term…
Abstract
Vanillin is difficult to separate from second organic chemicals produced therewith such as parahydroxybenzaldehyde by conventional distillation or rectification because of the proximity of their boiling points. Vanillin can now be readily separated from such second organic chemicals by azeotropic distillation using as an effective azeotropic distillation agent, dibenzyl ether.
Claims4
A method for recovering vanillin having the structure:
- ##STR20## from a mixture of (i) vanillin and (ii) a second organic chemical forming a single liquid phase with said vanillin at a temperature of from 20.degree. C. up to 50.degree. C. at 1 atmosphere pressure which comprises:
- (1) distilling a mixture of vanillin and said second organic chemical in the presence of an azeotrope forming agent which is dibenzyl ether having the structure:
- ##STR21## (2) recovering a single phase mixture of vanillin and dibenzyl ether azeotroping agent as overhead distillation product and said second organic chemical from a still pot;
- (3) separating said vanillin from said dibenzyl ether azeotrope forming agent by cooling said single phase mixture of vanillin and dibenzyl ether whereby vanillin crystals precipitate from said mixture of vanillin and dibenzyl ether;
- and
- (4) separating said vanillin crystals from said single phase mixture of vanillin and dibenzyl ether.
3 more elements
The method of claim 8 wherein the second organic chemical is parahydroxybenzaldehyde having the structure:
- ##STR22##
Dependencies are inferred from the claim text.