Alkylation of polycyclic aromatic compounds to alkylates enriched in the para-substituted isomers
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0317907A2
公开(公告)日:1989-05-31
Aromatic compounds, such as benzene or biphenyl, are alkylated with an alkylating agent, such as propylene, in the presence of an acidic mordenite zeolite catalyst under conditions sufficient to produce a mixture of substituted polycyclic aromatic compounds enriched in the para alkylated isomers, such as p-diisopropyl-benzene or p,p′-di(isopropyl)biphenyl, respectively. The novel acidic mordenite catalyst is characterized by its silica/alumina molar ratio, its porosity, and Symmetry Index. The p,p′-disubstituted isomers of aromatic compounds are useful as monomers in the preparation of thermotropic, liquid crystal polymers.
芳香族化合物(如苯或联苯)在酸性莫代沸石催化剂存在下与烷化剂(如丙烯)发生烷基化反应,其条件足以生成富含对位烷基化异构体的取代多环芳香族化合物混合物,如对二异丙基苯或对,p′-二(异丙基)联苯。新型酸性莫来石催化剂的特征在于其二氧化硅/氧化铝摩尔比、孔隙率和对称指数。芳香族化合物的对,对′-二取代异构体可用作制备热致性液晶聚合物的单体。