Influence of temperature on the kinetics absorption of carbon dioxide in aqueous of enzyme catalysed MDEA solutions

Nathalie J. M. C. Penders-van Elk, Coen van Aken, Geert F. Versteeg

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Abstract

In the present work the absorption of carbon dioxide in 1000 mol m(-3) N-methyldiethanolamine (MDEA) solutions with and without enzyme has been studied in a stirred cell reactor in the temperature range 278-343 K and enzyme concentrations ranging from 0 to 1600 gm(-3). During this study a new type of carbonic anhydrase has been tested: the evolved tetrameric enzyme GS6-046. The kinetic data from the new enzyme has been compared to the kinetic data obtained with the thermostable CA mutant 5X and the new enzyme showed a faster kinetics towards the CO2 hydration in combination with MDEA.

The experimental kinetic data from the evolved CA at the temperatures 278, 288 and 313 K resulted in a temperature dependent equation for the enzymatic rate constant K-H2O*. In the temperature range 278-313 K, this equation predicts k(H2O)* within an accuracy of 30%. However, at 343 K the measured k(H2O)* is significantly overestimated. (C) 2016 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)64-72
Number of pages9
JournalInternational Journal of Greenhouse Gas Control
Volume49
DOIs
Publication statusPublished - Jun-2016

Keywords

  • Carbon dioxide capture
  • Carbonic anhydrase
  • MDEA
  • Kinetics
  • Temperature
  • ALKANOLAMINE SOLUTIONS
  • DEHYDRATION KINETICS
  • TERTIARY-AMINES
  • CO2 ABSORPTION
  • 298 K
  • ANHYDRASE
  • HYDRATION
  • CAPTURE
  • ACID
  • WATER

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