English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Concentration and residence time effects in packed bed membrane reactors

Klose, F., Wolff, T., Thomas, S., & Seidel-Morgenstern, A. (2003). Concentration and residence time effects in packed bed membrane reactors. Catalysis today, 82, 25-40. doi:10.1016/S0009-2509(03)00308-7.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Klose, F.1, Author           
Wolff, T.2, Author           
Thomas, S.3, Author
Seidel-Morgenstern, A.2, 3, Author           
Affiliations:
1Process Synthesis and Process Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, ou_1738153              
2Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, ou_1738150              
3Otto-von-Guericke-Universität Magdeburg, External Organizations, ou_1738156              

Content

show
hide
Free keywords: -
 Abstract: A fixed bed reactor (FBR) and a packed bed membrane reactor (PBMR) were compared with respect to their performance in the oxidative dehydrogenation of ethane over VOx/-Al2O3 catalyst. The experiments were carried out at high space velocities and under oxygen excess conditions. In the PBMR, the oxidant air was distributed from the shell side of the membrane. At similar overall feed configurations, the conversion of ethane was found to be higher in the PBMR. This effect was most pronounced at the highest space velocity. Mostly ethylene yield was higher in the PBMR than in the FBR. However, the yield of carbon oxides increased more. Thus, an improvement of olefin selectivity was not observed. There were even sets of experimental conditions, where the ethylene yield in the PBMR fell below the corresponding value for the FBR. In the PBMR under oxygen excess conditions, the consecutive oxidation of ethylene is more favoured than in the FBR. Two essential reasons for the observed differences in the reactor performances are discussed. At first, there are different local reactant concentrations. Secondly, there are essential differences in the residence time behaviour of the reactants in the FBR and PBMR. In order to exemplify the latter aspect additional experiments have been carried out using a cascade of three identical PBMRs. Varying the specific oxygen flow rates over the individual membrane segment walls different dosing profiles were implemented. The results obtained in this study emphasise the general potential, but also the limits of membrane reactors compared to the FBR. copyright 2003 Elsevier Ltd. All rights reserved. [accessed 2013 November 28th]

Details

show
hide
Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 124817
Other: 12/04
DOI: 10.1016/S0009-2509(03)00308-7
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Catalysis today
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 82 Sequence Number: - Start / End Page: 25 - 40 Identifier: ISSN: 0920-5861
CoNE: https://pure.mpg.de/cone/journals/resource/954925564669