Kinetics and steric hindrance effects of carbon dioxide absorption into aqueous potassium alaninate solutions

Miri Kim, Ho Jun Song, Min Gu Lee, Ho Yong Jo, Jin Won Park

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Kinetic studies of carbon dioxide absorption into aqueous potassium alaninate (PA) solutions were performed using a stirred-cell reactor at concentrations ranging from 1.0 to 3.0 M and temperatures from 293.15 to 313.15 K. In the present work, the potassium salt of alanine was suggested as an energy-efficient absorbent for CO 2 capture. Densities and viscosities of the aqueous PA solution and physical solubilities of CO 2 in the solution were also measured to evaluate the reaction rate constant. The reaction rate was determined as the following equation:-rCO2=4.518×108exp(-3845T) exp(0.5706Cs)CsCCO2(-rCO 2: rate of reaction between absorbent and CO 2 gas [mol dm -3s -1]; T: temperature [K]; C s: concentration of PA solution [mol dm -3]; CCO 2: concentration of CO 2 in PA solution [mol dm -3]). Furthermore, the effect of the sterically hindered structure of PA was studied by comparing the diffusivity, physical solubility, and reaction rate constant with literature values of potassium glycinate.

Original languageEnglish
Pages (from-to)2570-2577
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume51
Issue number6
DOIs
Publication statusPublished - 2012 Feb 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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