Process for the purification of a dimethylphenol isomer

Details Process for the purification of a dimethylphenol isomer Process for the purification of a dimethylphenol isomer

1990-08-16

1992-03-10

Bascomb, Jr., Wilbur

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

203 48, 568751, 568756, B01D 314, C07C 3774, C07C 3784

Patent

active

050947222

ABSTRACT:
A purified desired isomer which is either 3,4- or 3,5-dimethylphenol is separated with a high yield from a dimethylphenol-containing fraction which contains both 3,4- and 3,5-dimethylphenols. The fraction is distilled so as to give a distillate which is enriched with the desired dimethylphenol isomer to be separated and which contains at least 35% by weight of the desired isomer. The desired DMP isomer is crystallized from a melt of the enriched distillate in two stages with at least part of the filtrate separated from the precipitated crystals in the second crystallization stage being circulated to the first crystallization stage. The enriched distillate is introduced into the first crystallization stage when it contains the desired isomer in a concentration of from 35% to less than 70% by weight, or it is introduced into the second crystallization stage when it contains the desired isomer in a concentration of 70% by weight or higher.

REFERENCES:
patent: 2536040 (1951-01-01), Davidson
patent: 2541682 (1951-02-01), Arnold
patent: 2861112 (1958-11-01), Christensen et al.
patent: 4447658 (1984-05-01), Leston

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