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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。
Coking benzene is a by-product of the iron and steel enterprises and coking enterprises. The key to making rational use of this resource is to find an effective method for removing sulfides from coking benzene. For this purpose, the desulfurization of thiophene in benzene with methanol and ethanol over zeolites of different types (including: ZSM-35, ZSM-48, Naβ, ZSM-5 with different grain sizes and mordenite) was studied. The results show that HZSM-5 has high activity and activity stability for the removal of thiophene in coking benzene. Thiophene reacts with methanol and ethanol, most of which is decomposed to produce hydrogen sulfide gas to escape, while the heavy components Alkyl thiophene. The catalytic performance of HZSM-5 zeolite in the reaction of dethiophene was investigated from three aspects of the ratio of benzene to alcohols, the simulated coking benzene with different thiophene contents and reaction space velocity. The average removal rate of thiophene in coking benzene under the reaction conditions of V (benzene) / V (methanol or ethanol) = 2: 1, reaction temperature of 430 ℃ (or 400 ℃) and mass space velocity of 4.5 h-1 Have reached more than 98%.