芳烃烷基化反应性能对烷基化脱除汽油中硫化物过程的影响

以苯、甲苯和二甲苯作为芳烃模型化合物,考察了它们的烷基化反应性能,并将其对噻吩烷基化反应性能的影响进行了比较。实验结果表明,苯和二甲苯的烷基化反应性能比甲苯低得多,在反应温度60℃、压力1.5M Pa、质量空速3.0h-1、反应时间1h时,苯、二甲苯的转化率分别为8.88%和1.76%,甲苯转化率较高(达到43.21%);芳烃的烷基化反应性能均远低于噻吩的烷基化反应性能,在苯、甲苯和二甲苯存在时,噻吩转化率分别达到98.04%,87.68%,59.85%;在烯烃过量的情况下,苯和甲苯对噻吩烷基化反应的影响很小,而二甲苯的存在则可以在反应刚开始的较短时间内抑制噻吩的烷基化反应;芳烃烷基化反应性能影响烯烃烷基化反应性能的强弱顺序为:二甲苯>甲苯>苯。

Alkylations of Aromtics and Their Influences on Thiophenes Alkylation in Gasoline Olefinic Alkylation of Thiophenic Sulfur

Alkylations of benzene,toluene,xylene,and their influences on thiophene and hexene alkylations were investigated.Aromatic alkylation was one set of three parallel competitive alkylations during olefinic alkylation of thiophenic sulfur(OATS).Under reaction conditions: temperature 60℃,pressure 1.5MPa,WHSV 3.0h~(-1),and reaction time 1h,alkylation conversions of benzene,xylene and toluene were only 8.88%,1.76%,and 43.21%,respectively.Alkylation capability of toluene was the best among the three aromatic analogs.But under same conditions in presence of benzene,xylene or toluene,alkylation conversions of thiophene could be up to(98.04%,)(87.68%) and(59.85%,)respectively.Alkylation capabilities of the three aromatics were far lower than that of thiophene.When concentration of hexene in system was superfluous,the influence of benzene and toluene on thiophene alkylation was not obvious,but xylene could restrain thiophene alkylation at initial stage of reaction.Alkylation of aromatics could also affect hexene alkylation(oligomerization)and the capability order was benzene