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Modeling catalyst deactivation in dehydrogenation of ethylbenzene to styrene

Babaei, J ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. Publisher: American Institute of Chemical Engineers , 2011
  3. Abstract:
  4. The long-term deactivation of a commercial K-promoted Fe2O3 catalyst used in the dehydrogenation of ethylbenzene to styrene monomer was investigated using 30 mo of operating data of three industrial SM radial fixed bed adiabatic reactors. The Langmuir-Hinshelwood, Hougen-Watson model was used for reaction kinetics modeling. The kinetics of coking from ethylbenzene and styrene and the short-term deactivation function due to the quick coke formation were considered in the model. The kinetics of long-term deactivation of the catalyst for ethylbenzene dehydrogenation to styrene at 550°-630°C were determined. Unknown parameters of the long-term activity function, related to the slow loss of potassium from the catalyst, were optimized. The optimized value of the order of the deactivation law was 3. The effect of internal mass-transport limitation was minimal. This is an abstract of a paper presented at the 2011 AIChE Spring Meeting & 7th Global Congress on Process Safety (Chicago, IL 3/13-17/2011)
  5. Keywords:
  6. Deactivation ; Dehydrogenation ; Ethylebenzene ; Styrene monomer
  7. Source: 11AIChE - 2011 AIChE Spring Meeting and 7th Global Congress on Process Safety, Conference Proceedings ; 2011 , Pages - ; 9780816910670 (ISBN)
  8. URL: http://www3.aiche.org/proceedings/Abstract.aspx?PaperID=213282