The catalyst active stability can be more fully recovered by regeneration carried out in three steps in succession, namely, benzeneextraction, nitrogen blowing and coke burning.
按苯抽提、氮气吹扫、烧焦的顺序，分三个阶段进行催化剂再生，再生催化剂的活性稳定性得到更充分的恢复。
2
Taking industry benzene as extraction agent, rogor is recovered from rogor synthesis waste water by multipolar counterflow extraction.
用工业苯做萃取剂，采用多塔对流萃取的方法回收废水中的乐果。
3
The major factors that affect benzene quality like excessive water and sulfur in aromatic extraction distillation unit are described.