CAJ | 학술논문

对ZSM-5沸石进行水热处理,将其按一定比例与丝光沸石复配制备了乙苯转化型二甲苯异构化催化剂(简称MZ催化剂);在连续流动固定床反应器中评价了MZ催化剂的异构化性能;考察了ZSM-5沸石的水热处理温度、处理时间和水蒸气用量对MZ催化剂异构化性能的影响.实验结果表明,较适宜的水热处理条件为:温度450～500 ℃,时间4～6 h,水蒸气用量18～36 g/h.在该条件下水热处理的ZSM-5沸石制备的MZ催化剂,在反应温度370 ℃、压力0.60 MPa、重时空速3.5 h~(-1)、n(H_2):n(原料油)为5.0的反应条件下,异构化活性达23%以上,乙苯转化率保持在38%左右,C_8芳烃收率在96%以上.
대ZSM-5비석진행수열처리,장기안일정비례여사광비석복배제비료을분전화형이갑분이구화최화제(간칭MZ최화제);재련속류동고정상반응기중평개료MZ최화제적이구화성능;고찰료ZSM-5비석적수열처리온도、처리시간화수증기용량대MZ최화제이구화성능적영향.실험결과표명,교괄의적수열처리조건위:온도450～500 ℃,시간4～6 h,수증기용량18～36 g/h.재해조건하수열처리적ZSM-5비석제비적MZ최화제,재반응온도370 ℃、압력0.60 MPa、중시공속3.5 h~(-1)、n(H_2):n(원료유)위5.0적반응조건하,이구화활성체23%이상,을분전화솔보지재38%좌우,C_8방경수솔재96%이상.
Xylene isomerization catalysts with feature of ethylbenzene conversion were prepared from mordenite and ZSM-5 zeolite according to a suitable ratio.The ZSM-5 zeolite was treated by high temperature steam in advance.The activity and selectivity of catalysts were studied in a continuous fixed bed down-flow reactor.Effects of steam treating temperature,time and steam flowrate on performance of the catalyst in xylene isomerization were investigated.Optimal treating conditions were: temperature 450-500 ℃,time 4-6 h and steam flowrate 18-36 g/h.Under optimal reaction conditions:370 ℃,0.60 MPa,WHSV 3.5 h~(-1),n(H_2):n(feed oil) 5.0,isomerization activity of the above catalyst was more than 23%,conversion of ethylbenzene was about 38% and yield of C_8 aromatics was more than 96%.