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Analysis of External and Internal Mass Transfer at Low Reynolds Numbers in a Multiple-Slit Packed Bed Microstructured Reactor for Synthesis of Methanol from Syngas

Abstract

The possibility of mass transfer limitations in an integrated micro packed bed reactor–heat exchanger (IMPBRHE) for methanol synthesis was experimentally investigated. Experiments were performed with three different particle size distributions (50–200 μm) of a Cu-based catalyst at 80 bar and 215–270 °C. Negligible effects of pore diffusion limitations on the performance of the reactor under methanol synthesis conditions for catalyst particle diameters up to 125 μm were found. Due to a very low Reynolds numbers (1) and dominance of molecular diffusion, variation of the total pressure was applied as a suitable technique to alter the diffusivities of reactants in the gas mixture by dilution, while keeping the reactant flow and partial pressure constant. No significant change in the CO conversion was observed in the temperature range 235–255 °C, pressure range 50–90 bar, and for reactant contact times of 105–308 ms·g/mL. The same procedure was applied to a laboratory fixed bed reactor with similar results. Possible heat transfer effects associated with the dilution were shown to be negligible. We therefore conclude that both reactor systems operate in the absence of external mass transfer limitations.

Category

Academic article

Language

English

Author(s)

  • Hamidreza Bakhtiary Davijany
  • Farbod Dadgar
  • Fatemeh Hayer
  • Xuyen Kim Phan
  • Rune Myrstad
  • Hilde Johnsen Venvik
  • Peter Pfeifer
  • Anders Holmen

Affiliation

  • SINTEF Industry / Process Technology
  • Royal Institute of Technology
  • Karlsruhe Institute of Technology
  • Norwegian University of Science and Technology

Year

2012

Published in

Industrial & Engineering Chemistry Research

ISSN

0888-5885

Volume

51

Issue

42

Page(s)

13574 - 13579

View this publication at Norwegian Research Information Repository