苯中噻吩与甲醇、乙醇在沸石分子筛上的脱硫反应

Desulfurization Reaction of Thiophene in Benzene with Methanol and Ethanol on Zeolite Molecule Sieves

焦化苯是钢铁企业和炼焦企业的副产品,合理利用此资源的关键是寻求一种有效的脱除焦化苯中硫化物的方法。为此,研究了苯中的噻吩与甲醇、乙醇在不同类型沸石分子筛(包括:ZSM-35、ZSM-48、Naβ、不同晶粒大小的ZSM-5及丝光沸石)上的脱硫反应。结果表明:HZSM-5对于脱除焦化苯中的噻吩具有较高的活性及活性稳定性,噻吩与甲醇、乙醇反应,绝大部分被分解生成硫化氢气体逸出,而极少生成重组分的烷基噻吩。并从苯醇比、不同噻吩含量的模拟焦化苯及反应空速3个方面对HZSM-5沸石分子筛催化反应脱噻吩的性能进行了考察。在V(苯)/V(甲醇或乙醇)=2:1、反应温度为430℃(或400℃)、质量空速为4.5h-1的反应条件下,焦化苯中的噻吩平均脱除率均达到98%以上。

Reaction of thiophene in benzene with methanol and ethanol by catalytic reaction on zeolite molecule sieves such as HZSM-5,HZSM-35,HZSM-48,H-β and H-Mordenite zeolite have been studied. HZSM-5 has a higher catalytic desulphurization activity, and thiophene reacting with carbonium ion which produced by methanol and ethanol over HZSM-5 is converted into sulfide hydrogen and a few amount of alkylthiophene. At reaction condition of V (benzene/ V (methanol or ethanol)=2:1,430 ℃ (or 400 ℃),WHSV 4.5 h -1 , the average removal rate of thiophene is more than 98%. The influence of benzene/methanol(or ethanol),concentration of thiophene in benzene and weight space velocity on the desulfurization ability of HZSM-5 have been also discussed in the paper.