Abstract: This topic was about recycling of trichlorobezene from the preparation of 2,4-dichlorofluobezene. As the analysis of the recycling liquid showed, 2,4-dichlorofluobezene was the main part, and there was also some 1,2,4-trichlorobenzene and a little of isomers of trichlorobenzene and polychlorobezene. Firstly, 2,4-dichlorofluobezene and 1,2,4-trichlorobenzene were gained by distiling with the purity of 98% and 88%, respectively. Then 1,2,4-trichlorobenzene with the purity of 95% was got by cleaning with detergent and water. Thirdly, 2,4,5-trichloronitrobenzene was prepared by nitration from 1,2,4-trichlorobenzene, with the purity of 99%. finally, 1,2,4-trichlorobenzene was converted to 2,4,5-trichloroaniline by reduction. Different methods of nitration and amount of nitrating reagent were tested in this article. As the result showed, when nitration took place with 35ml of 1,2,4-trichlorobenzene and 80ml of fuming nitric acid, 36.046g of 2,4,5-trichloronitrobenzene was gained, with the purity of 99,4%, and the purity of its reducing production could reached 99%.
