The p-methylaniline and other impurity in the crude product are adsorbed by active carbon and the purified 4B acid is precipitated out by acidic solution from middle compartment.
阴极碱性液溶解4B酸粗品，活性炭吸附除去从粗品中溶出的对甲苯胺等杂质，中间区的酸性液使4B酸精品析出。
In this paper, polymer films were prepared with o-toluidine, p-chloroaniline, m-trifluoro methylaniline and 5-trifluoromethyl-1,3-diaminobenzene as monomer by electrochemical method.
本文以邻甲基苯胺、对氯苯胺、间三氟甲基苯胺和5-三氟甲基-1，3-苯二胺为单体，利用电化学方法，得到了上述苯胺衍生物的聚合物薄膜。
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