Para-ester [para-(beta-hydroxyethyl sulfone sulphate) aniline] is one of the most important intermediates of reactive dyes. The content of chloraniline in para-ester should be strictly controlled in the synthesis process using acetaniline as raw material. The sulfonation process in the synthesis of para-ester by acetanilide was optimized. The effects of the quality of chlorosulfonic acid and the ratio of thionyl chloride to chlorosulfonic acid on p-chloroaniline in para-ester were discussed. When chloro sulfonic acid trioxide (SO3 > 68.7%) is used in the sulfonation process and the ratio of thionyl chloride to chloronic sulfonic acid is 0.25∶1, the content of p-chloroaniline in para-ester could be effectively reduced.
牛圣操,何海超. 杂质对氯苯胺在对位酯生产中的控制研究[J]. 煤炭与化工, 2019, 42(2): 137-139.
Niu Shengcao He Haichao. Study on control of p-chloroaniline in the production of para-ester. CCI, 2019, 42(2): 137-139.