Refining method with solvent mixed A with N-methyl pyrrolidone was used to decolor the FCC diesel oil.

For Zinc refiners adopting pyro-refining method, the method illustrated in this paper is a simple retrieving technique with additional high profits.

This paper introduces methanol refining method and pilot-scale production result by using 732-cation exchange resin and, summarizes activation and regeneration of the resin.