Chilled Ammonia Process for CO2 Capture

Victor Camille Alfred Darde, Kaj Thomsen, Willy J.M. van Well, Erling Halfdan Stenby

Research output: Contribution to journalConference articleResearchpeer-review


The chilled ammonia process absorbs the CO2 at low temperature (2–10°C). The heat of absorption of carbon dioxide by ammonia is significantly lower than for amines. In addition, degradation problems can be avoided and a high carbon dioxide capacity is achieved. Hence, this process shows good perspectives for decreasing the heat requirement. However, a scientific understanding of the processes is required. The thermodynamic properties of the NH3–CO2–H2O system were described using the extended UNIQUAC electrolyte model developed by Thomsen and Rasmussen in a temperature range from 0 to 110°C and pressure up to 100bars. The results show that solid phases consisting of ammonium carbonate and bicarbonate are formed in the absorber. The heat requirements in the absorber and in the desorber have been studied. The enthalpy calculations show that a heat requirement for the desorber lower than 2GJ/ton CO2 can be reached.
Original languageEnglish
JournalInternational Journal of Greenhouse Gas Control
Issue number2
Pages (from-to)131-136
Publication statusPublished - Mar 2010
Event9th International Conference on Greenhouse Gas Control Technologies - Washington, DC, United States
Duration: 16 Nov 200820 Nov 2008
Conference number: 9


Conference9th International Conference on Greenhouse Gas Control Technologies
CountryUnited States
CityWashington, DC
Internet address


  • CO2 capture
  • Chilled ammonia process
  • Extended UNIQUAC model
  • Aqueous ammonia
  • Carbon dioxide
  • CO2
  • NH3
  • H2O


Dive into the research topics of 'Chilled Ammonia Process for CO2 Capture'. Together they form a unique fingerprint.

Cite this