A COMPARATIVE STUDY OF LIQUID- AND GAS-PHASE CYCLOPENTENE HYDRATION CATALYZED BY THE MCM-22 ZEOLITE

0506991 - ÚFCH JH 2020 RIV CZ eng C - Conference Paper (international conference)
Krupka, J. - Otmar, J. - Pawlesa, Justyna
A COMPARATIVE STUDY OF LIQUID- AND GAS-PHASE CYCLOPENTENE HYDRATION CATALYZED BY THE MCM-22 ZEOLITE.
International Conference on Chemical Technology. In: Proceedings of the 3rd International Conference on Chemical Technology, ICCT 2015. Prague: Czech Society of Industrial Chemistry, 2015 - (Kalenda, P.; Lubojacký, J.), s. 60-65. ICCT. ISBN 978-80-86238-82-1.
[International Conference on Chemical Technology-ICCT2015/3./. Mikulov (CZ), 13.04.2015-15.04.2015]
Institutional support: RVO:61388955
Keywords : MCM-22 zeolite * cyclopentene * catalysis
OECD category: Physical chemistry

The study deals with technological aspects of the direct hydration of cyclopentene to cyclopentanol. The catalytic properties of the MCM 22 zeolite were studied in the case of cyclopentene hydration both in liquid and gas phases. MCM-22, unlike other solid acid catalysts, is highly selective for the formation of cyclopentanol in the liquid-phase hydration in the slurry arrangement. It suppresses completely the undesirable etherification of cyclopentanol and allows obtaining cyclopentanol with almost 99% selectivity. But the liquid-phase hydration was found to lead to rapid deactivation of the zeolite. The deactivation is caused mainly by a formation of carbon deposits in the pores of the zeolite. When hydrating in the gas phase on the fixed bed of granular catalyst, it could be easy to periodically reactivate the catalyst in situ. However, it has been found that the exceptional selectivity of MCM-22 to the cyclopentanol formation is characteristic only for the liquid-phase hydration. The reaction in the gas phase is unselective. Furthermore, the equilibrium conversion of cyclopentene to cyclopentanol in the gas-phase hydration has been found to be industrially unusable below 1 % (e.g. under atm. pressure, at 120 degrees C and with a molar ratio of cyclopentene to water 1: 5, it is as low as 0.3 %).
Permanent Link: http://hdl.handle.net/11104/0298103