Intensification of the chlor-alkali process by using a spinning disc membrane electrolyzer

P. Granados Mendoza, S. Moshtari Khah, A.S. Langenhan, M.T. de Groot, J.T.F. Keurentjes, J.C. Schouten, J. van der Schaaf

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Abstract

A zero-gap spinning disc membrane electrochemical reactor (SDMER) is presented for the intensification of the chlor-alkali process at high current densities up to 20 kA/m2. Two configurations of the SDMER, namely rotor-stator (RS) and thin-film (TF), are investigated and compared with a conventional parallel plate (PP) cell. The cell voltage as a function of current density is virtually identical for both SDMER configurations, and lower when compared to PP cell. The effect of the rotational speed on the cell voltage shows a decrease of 0.9 V at 6 kA/m2 when the rotational speed is increased from 40 to 60 rad/s. The estimated membrane permselectivity, increases with increasing current density to values between 0.95 and 0.98. The intensification of the chlor-alkali process was successful with the SDMER by obtaining an approximately three times higher production compared to the PP cell when increasing the current density from 6 kA/m2 to 20 kA/m2.
Original languageEnglish
Pages (from-to)120-129
Number of pages10
JournalChemical Engineering Research and Design
Volume128
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Chlor-alkali
  • Electrolyzer
  • Process intensification
  • Spinning disc
  • Zero-gap

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