Process for the recovery of 4-hydroxybenzaldehyde from reaction

Details Process for the recovery of 4-hydroxybenzaldehyde from reaction Process for the recovery of 4-hydroxybenzaldehyde from reaction

1996-01-26

1998-06-30

Manoharan, Virginia

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

Organic compounds

Oxygen containing

203 91, 210702, 210737, 568432, C07C 4578, C07C 4581

Patent

active

057736642

ABSTRACT:
A process for separating off poorly soluble by-products from reaction mixtures which are produced in the oxidation of p-cresol with oxygen or an oxygen-containing gas in methanol as solvent in the presence of alkali metal hydroxide and in the presence of metal compounds as catalyst, is characterized in that, after the oxidation, excess alkali is neutralized to the extent that a salt precipitate forms and this salt precipitate is separated off together with the poorly soluble by-products.

REFERENCES:
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patent: 4748278 (1988-05-01), Rohrscheid
patent: 4772754 (1988-09-01), Rohrscheid
Chemical Abstracts, vol. 113, No. 17, abstract No. 152027d, abstract of JP 02-172,942, (1990).
Chemical Abstracts, vol. 110, No. 3, abstract No. 23536h, abstract of JP 63-216,839, (1988).
Chemical Abstracts, vol. 120, No. 11, abstract No. 134031r, abstract of NL 9200968, (1994).
Chemical Abstracts, vol. 112, No. 17, abstract No. 157866r, abstract of EP 330 036, (1989).
Chemical Abstracts, vol. 111, No. 21, abstract No. 194299h, abstract of JP 01-106,838, (1989).
Chemical Abstracts, vol. 113, No. 15, abstract No. 131746x, abstract of JP 02-172,941, (1990).

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