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用苯作萃取剂,在温度为45℃,采用二级萃取分离含有硝基苯的废酸,使废酸中的硝基苯降至70ppm以下。
With benzene as extractant, at a temperature of 45 ° C, secondary extraction was used to separate the spent acid containing nitrobenzene to reduce nitrobenzene in the spent acid to less than 70 ppm.