Method for preparing aromatic carboxylic acids, aromatic aldehydes, and aromatic alcohols
AssigneeToray Industries, Inc.
InventorsShotaro Matsuoka, Masaaki Suematsu, Akira Kitamura
Life of this patent
Estimating the term…
Abstract
An aromatic carboxylic acid, aromatic aldehyde, and aromatic alcohol are simultaneously and efficiently prepared by liquid phase oxidizing an aromatic compound represented by formula (I) with a gas containing molecular oxygen, in a presence of a catalyst comprising transition metal compound, tertiary amine and bromide compound: 1
Claims38
A method for preparing at least one aromatic carboxylic acids, aromatic aldehydes, and aromatic alcohols, which comprises oxidizing at least one aromatic compound represented by following formula (I) as a raw material with molecule oxygen containing gas, in the presence of catalyst, comprising transition metal compound, tertiary amine, and bromide compound;
- 5
- (wherein n represents any of integer 1 to 5;
- and substituent R represents C1-18 alkyl group, C6-18 aryl group, C6-18 aralkyl group, halogen atom, haloalkyl group, OR1, SR1, SOR1, SO2R2, NO2, NR1R2, CH2OR1, CH(OR1)(OR2), C(OR1)(OR2)(OR3), COR1, or COCOR1 (wherein each of R1, R2 and R3 is selected from C1-18 alkyl group, C6-18 aryl group, and hydrogen atom);
- and when n takes 2 or more, R may be the same or different)
The method for preparing at least one of the aromatic carboxylic acids, aromatic aldehyde, and aromatic alcohol according to claim 12, wherein an amount of the water is 0.01 to 20 wt % with respect to the raw material.
A method for preparing at least one of the aromatic carboxylic acids, aromatic aldehyde, and aromatic alcohol, which comprises separating an aromatic compound from reacting solution, which is obtained by oxidizing aromatic compound represented by formula (I), and obtaining an aromatic aldehyde and aromatic alcohol;
- 6
- (wherein n, R, R1, R2, and R3 are as defined above).
A method for preparing at least one of an aldehyde and an alcohol from a mixture comprising the aldehyde and the alcohol, wherein the mixture is distilled by adding a base.
A method for preparing an aromatic carboxylic acid, which comprises purifying by washing a crude aromatic carboxylic acid, which is obtained by oxidizing a raw aromatic hydrocarbon having at least one methyl groups, with the raw aromatic hydrocarbon, and simultaneously recycling for using a solution obtained by the washing operation as a raw material.
Dependencies are inferred from the claim text.