Separation of p-menthane from p-cymene by extractive distillatio

Details Separation of p-menthane from p-cymene by extractive distillatio Separation of p-menthane from p-cymene by extractive distillatio

1990-12-14

1992-04-21

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 56, 203 60, 203 62, 203 63, 203 64, 585806, 585864, 585866, B01D 340, C07C 708

Patent

active

051064596

ABSTRACT:
p-Cymene and p-menthane are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. p-Cymene and p-menthane can be readily separated one from another by using azeotropic or extractive distillation. Typical examples of effective agents, for azeotropic distillation: diethyelene glycol ethyl ether, 1-pentanol and isobutanol; for extractive distillation: butyl benzoate, undecyl alcohol and methyl benzoate.

REFERENCES:
patent: 2952717 (1960-09-01), Fleck et al.
patent: 3288688 (1966-11-01), Kane
patent: 3366568 (1968-01-01), Eisenlohr et al.
patent: 3530195 (1970-09-01), Amir
patent: 4128594 (1978-12-01), Westernacher
patent: 4514262 (1985-04-01), Berg

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