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联苯胺及其衍生物是合成染料的重要中间体,过去我国每年生产的联苯胺和由其中间体制成的各种染料产量在万吨以上,但由于联苯胺对接触工人具有肯定的致癌作用,所以近年来许多国家均已先
Benzidine and its derivatives are important intermediates for synthetic dyes. In the past, the annual production of benzidine and various dyes made from its intermediates was over 10,000 tons, but due to the positive carcinogenic effect of benzidine on workers exposed to it, So in recent years many countries have