Selective Positional Isomerization of Butene-2 over Mesoporous Silicates
Jong-Ki Jeon1, Heejin Lee1, Jin-Heong Yim2, Young-Kwon Park3, Yong Seung Kim4, and Seong Jun Lee4. (1) Department of Chemical Engineering, Kongju National University, Shinkwan-dong, Gongju 314-701, South Korea, (2) Dev. of Advanced Materials Engineering, Kongju National University, Shinkwan-dong, Gongju 314-701, South Korea, (3) Faculty of Environmental Engineering, University of Seoul, Seoul 130-743, South Korea, (4) Chemicals R&D Center, SK Corporation, Youseong-gu, Daejeon 305-712, South Korea
Because butene-1 is used as a monomer for the production of linear low density polyethylene (LLDPE) and polybutene, the worldwide demand of butene-1 is gradually increasing. It is necessary to convert butene-2 among C4 raffinate in petrochemical plant and refinery to butene-1 valuable component. It is necessary to produce butene-1 selectively in butene-2 isomerization, because the byproducts such as iso-butene, octenes, and propylene can be produced through skeletal isomerization, oligomerization, and cracking, respectively. In order to increase the selectivity to butene-1 in butene-2 isomerization, mesoporous silicates were adapted as catalysts in this study. The yield of butene-1 over MCM-41, Al-MCM-41, and MCM-48 was higher than that over alumina-based catalysts. The activity and selectivity over mesoporous silicates in butene-2 hydrogenation were correlated the acidity of the catalysts through ammonia-temperature programmed desorption (TPD) and pyridine FT-IR.