Zhao Yong
2012
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Dyestuffs and coloration
Abstract
3,5-Diaminobenzoic acid was synthesized from 3,5-dinitrobenzoic acid by catalytic hydrogenation.The effects of the different reaction concentration,reaction temperature and hydrogen pressure on purity of reduction were investigated by orthogonal tests.The effect of reaction concentration on the reduction yield was studied.The optimum conditions determined by the experiments were the ratio of water volume to nitrate quantity 1:8,the reaction temperature 60~65℃,the hydrogen pressure 0.5~0.7 MPa.The yield of reduction was up to 97%,the conversion rate was 100% and the purity was above 99.5%.