Process for the distillative purification of citral

Details Process for the distillative purification of citral Process for the distillative purification of citral

1990-10-18

1992-03-10

Bascomb, Jr., Wilbur

Distillation: processes, separatory

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

203 33, 203 34, 203 35, 203 38, 203 91, 568449, 568492, B01D 310, C07C 4582, C07C 4721

Patent

active

050947206

ABSTRACT:
A method is disclosed for enhancing the purification of citral by fractional distillation by inhibiting the formation of isocitrals from isomerization of citral during the distillation process. The method involves reducing the pH of a mixture containing citral to inhibit the formation of isocitrals from citral upon heating, such as in distillation. Lowering the pH below 7 reduces formation of isocitrals, but a pH of about 4 to 5 is especially preferred. Most preferably, this pH adjustment is accomplished by addition of an acid with a pKa between about 4 and 5.

REFERENCES:
patent: 4288636 (1981-09-01), Nissen et al.
patent: 4463196 (1984-07-01), Chabardes et al.
patent: 4467120 (1984-08-01), Fischer et al.
patent: 4720327 (1988-01-01), Aquila et al.
patent: 4933500 (1990-06-01), Chabardes et al.
patent: 4978804 (1990-12-01), Woell
Kingston, B. H., "A Fresh Look at Citral", Manufacturing Chemist, Dec. 1962, p. 510.

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