Reactions of Supercritical Water with Benzaldehyde, Benzylidenebenzylamine,Benzyl Alcohol, and Benzoic Acid

摘要

This paper describes the results of reactions of benzaldehyde, benzyl alcohol,benzoic acid, and benzylidenebenzylamine (C6H5CH2N=CHC6H5) With supercritical water (SW) since these compounds were determined or assumed to be major intermediates in the reaction of benzylamine with SW. Supplementary information was obtained from the benzyl benzoate-SW reaction. The kinetics of the benzaldehyde-SW reaction were found to be complex, second-order in benzaldehyde, and inhibited by product(s). The Arrhenius parameters for the second-order rate constant are an activation energy of 179 kJ mol-1 and preexponential factor of 1.6 x 1010 M-1 s-1. In addition, the influences of ammonia and dihydroanthracene on some of the product distributions and extents of reaction were determined. Of particular interest is the reaction pathway leading to the formation of benzene and related products which requires an oxidation/hydrolysis sequence, terminated by decarboxylation to form hydrocarbons. The mechanistic significance of the benzene/toluene product-yield ratios is discussed. Heteroatom removal, Chemical oxidation, Complex kinetics, Reaction pathways.