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对二甲苯是聚酯工业的重要原料。工业上,它从催化重整油或裂解制乙烯的副产C_8芳烃馏分中分离而得;也可用甲苯或甲苯与C_9芳烃为原料经歧化与烷基转移反应,再经异构化反应和分离而得。目前国内外应用最广泛的歧化与烷基转移工艺以丝光沸石或稀土Y沸石为催化剂,得到的产物是苯和接近热力学平衡组成的混合二甲苯,主反应式为:
Paraxylene is an important raw material for polyester industry. In the industry, it is obtained from the separation of byproduct C_8 aromatics from catalytic reformate or cracked ethylene; it can also be obtained by the reaction of disproportionation and transalkylation with toluene or toluene and C9 aromatics as feedstock, followed by isomerization and separation And got it. Currently the most widely used disproportionation and transalkylation technology at home and abroad to mordenite or rare earth zeolite Y as a catalyst, the resulting product is benzene and nearly thermodynamically balanced mixture of xylene, the main reaction is: