Acylation of p-xylene over zeolites

0375911 - ÚFCH JH 2013 RIV NL eng J - Journal Article
Vitvarová, Dana - Kurfiřtová, Lenka - Pavlatová, Jana
Acylation of p-xylene over zeolites.
Catalysis Today. Roč. 179, č. 1 (2012), s. 78-84. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA ČR GA104/07/0383; GA ČR GD203/08/H032
Institutional research plan: CEZ:AV0Z40400503
Keywords : acylation * p-xylene * zeolites
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.980, year: 2012

Zeolites differing in structure and acidity were tested in liquid phase acylation of p-xylene. Hexanoyl chloride, propionic anhydride and isobutyric anhydride were used as acylating agents. The highest conversions of acylating agent were achieved over large pore zeolites USY (66.3%) and Beta (58.2%). It was found that acylation of p-xylene proceeds only over large pore zeolites Beta and USY. Selectivities to monoacylated p-xylene obtained over USY zeolite decreased in the order: propionic anhydride 78.0% > hexanoyl chloride 67.2% > isobutyric anhydride 33.1%. Diacylated product was formed over zeolite USY with all acylating agents tested but only with hexanoyl chloride over zeolite Beta. It was found that the optimum Si/Al ratio of zeolite Beta for p-xylene acylation with propionic anhydride is 25, while for isobutyric anhydride is 19. Conversion of isobutyric anhydride decreased with increasing isobutyric anhydride concentration and increased with increasing amount of catalyst.
Permanent Link: http://hdl.handle.net/11104/0208450