FCC过程中噻吩类硫化物转化规律的研究进展

综述了FCC过程中噻吩类硫化物的裂化脱硫机理和转化途径,并从转化率和选择性出发,分析了不同结构的噻吩类硫化物的反应特点。在FCC条件下,噻吩的转化率较低,而带有烷基侧链的噻吩和苯并噻吩均具有较高的转化活性,其中短侧链的烷基噻吩类硫化物易于发生异构化和脱烷基反应,而长侧链的烷基噻吩类硫化物易于发生侧链裂化和环化反应;反应体系中的其他烃类及催化剂的性质也对噻吩类硫化物的反应路径和转化率有一定的影响,其中大分子烷烃和环烷烃等供氢剂和氢转移活性高的催化剂均有利于噻吩类硫化物的裂化脱硫。在此基础上,进一步总结了典型的噻吩类硫化物的转化网络。

Research Progresses in Conversion of Thiophene Derivatives in FCC Process

Cracking desulfurization mechanisms of thiophene and its derivatives in FCC process were reviewed.The effect of molecular structures of thiophene and its derivatives on the cracking desulfurization was discussed in detail.Many researches showed that the thiophene conversion was slow under the FCC conditions.The reaction activities of thiophene derivatives with side chains were higher than that of thiophene.Alkyl-thiophene derivatives with short side chain trend to isomeration and dealkylation,and alkyl-thiophene derivatives with long side chain trend to cracking and cyclisation of the side chains.The effects of the properties of both the hydrocarbons and catalysts on the cracking desulfurization of thiophene derivatives were evident.The hydrogen donor,such as alkanes and cycloparaffins,and the catalysts with high hydrogen transfer activity were conducive to the cracking desulfurization.Based on the above discussion,a reaction network for the cracking desulfurization of typical thiophene derivatives was proposed.