Removal Thiophene From Coking Benzene

In this work, the deep oxidation desulfurization of coking benzene was investigaed, using benzene and thiophene of simulated coking benzene as raw material and the potassium permanganate as the oxidant.At first, the effect of desulfurization was studied only with the potassium permanganate solution as the oxidant in coking benzene. The results show that the thiophene in the benzene could be removed in KMnO4solution alone, but not reached up to the effect of the deep desulfurization.Secondly, by means of dissolved KMnO4in HCl solution or ferric chloride medium constitute KMnO4-HCl and KMnO4-FeCl3system, the effect of the oxidation chlorinated desulfurization in coking benzene was observed. When the chlorides were used as the co-reactant, the content of thiophene can be decreased from1800ppm to200ppm, while KMnO4-HCl system reduced to0.012g/100mL, KMnO4-FeCl3system reduced to0.005g/100mL, which both meet the2009new national standard on coking benzene (the content of thiophene is0.04g/100ml). In the process of analysis, the thiophene obtained was characterized by GC-MS; the mechanism of removal thiophene was discussed, speculated that in the desulfurization process of KMnO4-HCl system and KMnO4-FeCl3system, there are synergetic effect of oxidative desulfurization and chlorinated desulfurization..During the process of desulfurization, there were some by-products, including KMnO4, MnO2, benzene, thiophene derivatives and glial, etc. Nano8-MnO2was extracted from the by-products in the process of separation, washing and setting to reduce the negtive effect on the environment. The composite of LiMnO4was prepared by solid-state reaction, which lay the foundation for treatment of by-products in the oxidative desulfurization process.