Patent ID: 6103933
Filing Date: 2000-08-15
Classification: B01J,C07C

Abstract:
A method of controlling the oxidation rate of a C5-C12 cycloaliphatic hydrocarbon to the corresponding dibasic acid, comprising the steps of:(a) feeding continually into a major reaction zone the cycloaliphatic hydrocarbon an oxidant, a rate-modulator, a catalyst, and a solvent comprising an organic acid containing only primary and/or secondary hydrogen atoms, the cycloaliphatic hydrocarbon and the rate-modulator being fed at a first hydrocarbon to rate-modulator ratio the first ratio being 80/20 or higher;(b) causing the oxidant to react with the cycloaliphatic hydrocarbon;(c) monitoring reaction rate and the first hydrocarbon to rate-modulator ratio; and(d) maintaining the reaction rate within, or directing the reaction rate toward a predetermined range, by making adjustments comprising steps of increasing the first hydrocarbon to rate-modulator ratio if the reaction rate is found in step (c) to be above the predetermined range, until the reaction rate falls within the predetermined range and decreasing the first hydrocarbon to rate-modulator ratio if the reaction rate is found in step (c) to be under the predetermined range, until the reaction rate falls within the predetermined range.