Kinetic behavior of potassium bicarbonate crystallization in a carbonate-based CO2 absorption process

Research output: Contribution to journalArticle

Abstract

A carbonate-based CO2 absorption process is currently under development that involves crystallizing potassium bicarbonate from a potassium carbonate/bicarbonate solution to form slurry used for stripping CO2 at high pressure. Kinetics of the bicarbonate crystallization process was investigated using a laboratory mixed suspension, mixed product removal (MSMPR) reactor. Effects of the mean residence time, agitation speed, relative supersaturation level, crystallization temperature, and suspension density on nucleation and growth rates of the bicarbonate crystals were quantified. The observed crystal population density distribution featured a size-dependent growth pattern. A three-parameter kinetic model was used for bicarbonate crystallization, and model parameters were determined by fitting the experimental data. Crystallization kinetics was applied to perform a preliminary analysis of the crystallizer design for the carbonate-based CO2 capture process.

Original languageEnglish (US)
Pages (from-to)136-147
Number of pages12
JournalChemical Engineering Research and Design
Volume93
DOIs
StatePublished - Jan 1 2015

Keywords

  • Bicarbonate
  • CO absorption
  • Carbonate
  • Crystallization
  • Kinetics
  • Process design

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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