شماره ركورد كنفرانس :
4518
عنوان مقاله :
The deactivation of active sites in liquid-phase alkylation of isobutane with butenes
Author/Authors :
Saeed Sahebdelfar Catalyst Research Group, Petrochemical Research and Technology Company, National Petrochemical Company, Tehran , Mohammad Kazemeini Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran , Farhad Khorasheh Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran
كليدواژه :
isobutane alkylation , solid acids , active site , catalyst deactivation , kinetics
عنوان كنفرانس :
The 7th International Chemical Engineering Congress & Exhibition (IChEC 2011
چكيده لاتين :
The deactivation of acid sites of zeolitic catalysts in alkylation of isobutane with butenes was
studied. The reactions were lumped into two main reactions; namely, alkylation and the undesired
oligomerization reaction which require very strong and moderate acid sites, respectively. The
conversion data of a liquid-phase mixed-flow reactor were analyzed by differential method of
analysis to obtain deactivation kinetics. It was found that the activity decline of the individual
reactions is the same during useful life of the catalyst, when alkylation is the main reaction,
confirming the common approach used for modeling of alkylation reactors, i.e., same types of
active sites for different reactions. However, after useful catalyst life, the remaining alkylation
sites deactivates much more quickly than oligomerization sites. The deactivation rate constants for
alkylation and oligomerization reactions were obtained as 7400 and 6400 lit2/(mol2.h),
respectively, at 65°C.
