N-甲基吗啉对甲苯歧化与烷基转移催化剂的影响

N-甲基吗啉是芳烃联合装置中的抽提溶剂，含有少量进入抽提产品之一的甲苯。研究了C₉芳烃原料中N-甲基吗啉对ZA-92甲苯歧化与烷基转移工业催化剂催化性能的影响。实验结果表明，在3.0 MPa、空速1.5 h^－1、n(氢)∶n(烃)=6.7∶1、385 ℃条件下，原料中N-甲基吗啉质量分数≤100×10^－6时，反应24 h后，催化剂仍具有良好的活性；N-甲基吗啉质量分数为50×10^－6时，反应500 h后催化剂活性明显下降。

Influence of N-methylmorpholine on behaviors of the catalyst for toluene disproportionation and transalkylation

N-methylmorpholine, as the extraction solvent in aromatics plant, would come into the toluene product in micro-scale amount. Influence of N-methylmorpholine in C_9 aromatics feed on behaviors of ZA-92 catalyst for toluene disproportionation and transalkylation were investigated. The results showed that , with N-methylmorpholine content in the feed 10010~(-6)(mass fraction), activity of the catalyst saw little declining after 24 h of reaction at 3.0 MPa, 385 , WHSV 1.5 h~(-1) and n(H_2)/n(F)=(6.7/1); with 50 10~(-6)(mass fraction) N-methylmorpholine in the feed, activity of the catalyst declined remarkably after reaction for 500 h. N-methylmorpholine content in the C_9 feed should be well under control to keep high catalyst activity of the catalyst.