Process for obtaining para-cresol and meta-cresol from a mixture

Details Process for obtaining para-cresol and meta-cresol from a mixture Process for obtaining para-cresol and meta-cresol from a mixture

1979-06-29

1981-05-12

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568750, C07C 3768, C07C 3774

Patent

active

042673917

ABSTRACT:
A process is disclosed for the stepwise separation of para-cresol and meta-cresol from a mixture of methylated and ethylated phenols. The para-cresol preferentially forms a complex with a dehydrated or anhydrous inorganic salt selected from the group consisting of calcium bromide, lithium bromide, manganese bromide and magnesium chloride. The meta-cresol isomer is separated from the mixture by formation of a complex with urea. Where the anhydrous or dehydrated inorganic salt is added firstly to the mixture of methylated and ethylated phenols including para-cresol and meta-cresol, the salt is provided in an amount to give a mole ratio of the salt to para-cresol in the mixture in the range of about 0.5 to one to about 1.5 to one. The para-cresol complexes with the salt and the complex is then removed from the mixture. The para-cresol-salt complex is thereafter decomposed to recover the para-cresol. The mixture of methylated and ethylated phenols including meta-cresol from which the para cresol has been removed has added to it urea in an amount to give a mole ratio of urea to meta-cresol in the mixture in the range of about 0.7 to one to about 1.3 to one. The meta-cresol-urea complex is then separated from the mixture of methylated and ethylated phenols and thereafter the complex is decomposed by hydrolysis to produce a high purity meta-cresol. It is a feature of the invention that either of the complexing steps may be performed first; that is, either of the anhydrous salt or the urea may be added to the mixture, followed thereafter by addition of the other complexing agent.

REFERENCES:
patent: 1830859 (1931-11-01), Schotte
patent: 1980384 (1934-11-01), Comte
patent: 2042331 (1936-05-01), Carswell
patent: 2366538 (1945-01-01), Luten
patent: 2835714 (1958-05-01), Nixon et al.
Sharpless, et al. "Jour. Organic Chemistry", vol. 40, No. 9 (1975).

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