萘对非贵金属改性甲苯歧化催化剂反应性能的影响

Effects of Naphthalene on Toluene and Heavy Aromatics Disproportionation and Transalkylation over Non-noble Metal Modified Catalyst

研究了原料中萘含量对非贵金属改性催化剂上甲苯与重芳烃歧化和烷基转移反应的影响。结果表明:随着原料中萘含量的增加,甲苯与重芳烃歧化和烷基转移反应受到的抑制效果增加,需以提高反应温度来补偿催化剂活性的损失;撤掉原料中的萘后,甲苯歧化反应不能完全恢复,重芳烃烷基转移反应能够恢复。萘系物在反应过程中存在一平衡值:原料中不含萘时,甲苯与重芳烃歧化与烷基转移反应副产少量萘系物;原料中萘含量低于平衡值时,萘主要发生烷基转移反应,生成烷基萘;原料中萘含量高于平衡值时,萘除了发生烷基转移反应外,还发生了加氢裂解反应。

In order to make full use of C10 aromatic （C10A） resources, the effects of naphthalene content in feedstock on the disproportionation and transalkylation of toluene with C9 and C10 aromatics over non-noble metal modified catalyst were investigated. The results indicated that with the increase of naphthalene content in feedstock, the catalytic activity of disproportionation and transalkylation of toluene with C9 and C10 aromatics transalkylation decreased, and the reaction temperature should be raised to improve catalyst activity. After withdrawing naphthalene, the transalkylation of C9 and C10 aromatics was recovered, while toluene disproportionation was not. Naphthalene derivatives had an equilibrium composition in the reaction system. When there was no naphthalene in the feedstock, naphthalene derivatives were produced as the by-products of the disproportionation and transalkylation of toluene with C9 and C10 aromatics. When naphthalene content was lower than the equilibrium value, naphthalene was mainly converted to alkylnaphthalenes through transalkylation. When naphthalene content was higher than the equilibrium value, while naphthalene was mainly converted to alkylnaphthalene and light aromatics through both transalkylation and hydrocracking.