超临界条件下β-甲基萘的歧化反应  

DISPROPORTIONATION OF β-METHYLNAPHTHALENE UNDER SUPERCRITICAL CONDITION

作　　者：吴伟[1] 白雪峰[2] 

机构地区：[1]黑龙江大学化学与材料学院,黑龙江哈尔滨150070 [2]黑龙江省石油化学研究院,黑龙江哈尔滨150040

出　　处：《石油学报（石油加工）》2006年第4期89-93,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金(20276011和20376012)资助项目

摘　　要：研究了HZSM-5沸石催化β-甲基萘(β-MN)歧化合成2,6-二甲基萘(2,6-DMN)的反应。通过正交试验,优化了β-MN歧化的反应条件。控制反应温度为420℃,质量空速(MHSV)为0.6h-1,考察了反应压力对β-MN歧化的转化率、2,6-DMN选择性以及HZSM-5沸石使用寿命的影响。采用TPD-NH3和TG表征了常压和超临界态下反应前后催化剂的性能。结果表明,随着反应压力的升高,β-MN歧化的转化率提高,HZSM-5沸石使用寿命延长。当反应体系进入超临界态时,反应70h,反应转化率可维持在14%以上,而常压下反应8h,反应转化率已降至1.23%。在超临界条件下进行β-MN歧化反应不仅可以提高催化反应活性,而且还能原位维持催化剂的活性,延长催化剂的寿命。The disproportionation of β-methylnaphthalene （ β-MN ） to prepare 2,6-dimethylnaphthalene （2, 6-DMN） over HZSM-5 zeolite was studied. The reaction conditions of disproportionation of β-MN were optimized by the orthogonal experiments. The effects of reaction pressure on the conversion of β-MN, the selectivity of 2,6-DMN and the lifetime of HZSM-5 zeolite were investigated under the reaction temperature of 420℃ and MHSV of 0.6 h^-1. The properties of fresh catalyst and the catalysts used under ambient pressure and supercritical condition were characterized and compared by TPD-NH3 and TG analysis. The results showed that with the increase of reaction pressure, the conversion of β-MN increased and lifetime of HZSM-5 zeolite extended. When the reaction condition was above the critical temperature and pressure of the inert reaction solvent, the conversion of β-MN kept higher than 14%, whereas decreased to 1.23% for ambient pressure reaction. If the disproportionation of β-MN is carried out under the supercritical condition, not only the catalytic activity of HZSM-5 will be enhanced, but also the higher reaction activity in situ and longer service life of the catalyst will be obtained.

关 键 词：超临界 β-甲摹萘 2 6-二甲基萘 歧化反应 HZSM-5沸石 

分 类 号：TQ032.4[化学工程]