Patent ID: 6437176
Filing Date: 2002-08-20
Classification: C07C

Abstract:
A method for preparing each of an aromatic carboxylic acids, an aromatic aldehyde, and an aromatic alcohol, which comprises the steps of:oxidizing an aromatic compound represented by formula (I) to obtain approximately aromatic carboxylic acid, 10-40% aromatic aldehyde, and aromatic alcohol; wherein n represents an integer of 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, SO2 R2, NO2, NR1R2, CH2OR1, CH(OR1)(OR2), C(OR1)(OR2)(OR3), COR1, and 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; and separating the aromatic carboxylic acid from a reaction solution by one of crystallization and acid precipitation to obtain the aromatic carboxylic acid and a residue including the aromatic aldehyde and the aromatic alcohol; further separating and isolating each of the aromatic aldehyde and the aromatic alcohol by distillation from the residue; wherein the distillation of the aromatic aldehyde and the aromatic alcohol is carried out after removing the acid components.