Prediction of Gas-Liquid Equilibria of CO2-K2CO3-MDEA-H2O System by Electrolyte UNIQUAC Model

saidah altway, Kuswandi Kuswandi, Ali Altway

Abstract


Carbon dioxide is an acid gas that can be harmful impurity especially in the chemical industry. Various processes have been developed to reduce the CO2 from the gas stream. Chemical absorption is the most economical method for CO2 separation. One of the processes that is widely used in industries is Benfield process with K2CO3 (potassium carbonate) as a solvent and amine as a promotor. In this study, MDEA (Methyldiethanolamine) is used as a promotor. As a reference for designing CO2 absorption/stripping packed column in industries, gas-liquid equilibrium data were required. The objective of this study is to predict the gas-liquid equilibria of CO2-K2CO3-MDEA-H2O system at 30oC and atmospheric pressure with 30% K2CO3 and variation of weight percent of MDEA 2, 5, 8, and 10%. The model used in this study is an electrolyte UNIQUAC. The simulation was conducted using Matlab programming. The deviation of predicted CO2 partial pressure with the experimental data is 14.85%. The energy interaction parameters of electrolyte UNIQUAC model were obtained from fitting with the experimental data by Least Square method. The results of this study represented that with increasing CO2 partial pressure, CO2 loading increased, and also at the same partial pressure of CO2, CO2 loading increased with the increase of weight percent of MDEA

Keywords


Gas-Liquid Equilibria; Methyldiethanolamine; Electrolyte UNIQUAC Model; Energy Interaction Parameter

Full Text:

PDF

References


. Anand B Rao and Edward S Rubin, "A Technical, Economic, and Environmental Assessment of Amine-based CO2 Capture Technology for Power Plant Greenhouse Gas Control.," Environmental, Science, & Technology, vol. 36, no. 20, pp. 4467-4475, September 2002.

. Hongyi Dang and Gary T Rochelle, "CO2 absorption rate and solubility in monoethanolamine/piperazine/water," in The First National Conference on Carbon Sequestration, Washington, DC, 2001.

. John Timothy Cullinane, "Thermodynamics and Kinetics of Aqueous Piperazine with Potassium Carbonate for Carbon Dioxide Absorption," University of Texas, Austin, PhD Dissertation 2005.

. Sander Bo, Aage Fredenslund, and Peter Rasmussen, "Calculation of Vapour-Liquid Equilibria in Mixed Solvent/salt Systems using an Extended UNIQUAC Equation," Chemical Engineering Science, vol. 41, no. 5, pp. 1171-1183, 1968.

. David M Austgen, Gary T Rochelle, Xiao Peng, and Chau- Chyun Chen, "Model of Vapor-Liquid Equilibria for Aqueous Acid Gas-Alkanolamine Systems Using the Electrolyte-NRTL Equation," Industrial & Engineering Chemistry Research, vol. 28, no. 7, pp. 1060-1073, July 1989.

. Mark L Posey, "Thermodynamics Model for Acid Gas Loaded Aqueous Alkanolamine Solutions," University of Texas, Austin, PhD Dissertation 1996.

. Marcus D Hilliard, "A Predictive Model for Aqueous Potassium Carbonate, Piperazine, Monoethanolamine for Carbon Dioxide Removal from Flue Gas," University of Texas, Austin, PhD Dissertation 2008.

. A Benamor and M K Aroua, "Modeling of CO2 Solubility and Carbamate Concentration in DEA, MDEA and Their Mixtures Using The Deshmukh-Mather Model," Fluid Phase Equilibria, vol. 231, no. 2, pp. 150-162, April 2005.

. Hawar A M Haider, Rozita Yusoff, and M K Aroua, "Equilibrium Solubility of Carbondioxide in 2(Methylamino)ethanol," Fluid Phase Equilibria, vol. 303, no. 2, pp. 162-167, April 2011.

. Saeid Kamalpour and Amine Mehablia, "Thermodynamics of CO2-MDEA using eNRTL with Differential Evolution Algorithm," International Journal of Thermodynamics (IJoT), vol. 15, no. 3, pp. 157-168, June 2012.

. H E Benson, J H Field, and W P Haynes, "Improved Process for CO2 Absorption Uses Hot Carbonate Solutions," Chemical Engineering Progress, vol. 52, no. 10, pp. 433-438, 1956.

. Gianni Astarita, David W Savage, and John M Longo, "Promotion of CO2 mass transfer in carbonate solutions," Chemical Engineering Science, vol. 36, no. 3, pp. 581-588, 1981.

. R K Bartoo, T M Gemborys, and C W Wolf, "Recent Improvements to the Benfield Process Extend its Use," in Nitrogen '91 Conference, Copenhagen, Denmark., 1991.

. D W Savage, G Sartori, and G Astarita, "Amines as Rate Promoters for Carbon Dioxide Hydrolysis," Faraday Discussion of The Chemical Society, vol. 77, pp. 17-31, 1984.

. M R Rahimpour and A Z Kashkooli, "Enhanced Carbon Dioxide Removal by Promoted Hot Potassium Carbonate in a Split-Flow Absorber," Chemical Engineering Processing : Process Intensification, vol. 43, no. 7, pp. 857-856, July 2004.

. J Tim Cullinane and Gary T Rochelle, "Carbon Dioxide Absorption with Aqueous Potassium Carbonate Promoted by Piperazine," Chemical Engineering Science, vol. 59, no. 17, pp. 3619-3630, September 2004.

. John Polasek and Jerry A Bullin, "Selecting amines for Sweetening Units," in Gas Processors Association (GPA) Regional Meeting,"Process Considerations in Selecting Amine", Tulsa, Oklahoma, 1994.

. Sholichatun and E R Finalis, "The Influence of an Additive MDEA on Solubility of CO2 in Aqueous Solution of K2CO3," Institut Teknologi Sepuluh Nopember, Surabaya, Bachelor Final Project 2010.

. L Kaewsichan, "A Vapor-Liquid Equilibrium Model for CO2-H2S-Monoethanolamine-Methyldiethanolamine-Water System using The Electrolyte UNIQUAC Equation,” , Colorado School of Mines.," Colorado School of Mines, Goldren, PhD Thesis 1999.

. L Kaewsichan, O Al-Bofersen, Victor F Yesavage, and M Sami Selim, "Predictions of The Solubility of Acid Gases in Monoethanolamine (MEA) and Methyldiethanolamine (MDEA) Solutions using The Electrolyte-UNIQUAC Model," Fluid Phase Equilibria, vol. 183-184, pp. 159-171, July 2001.

. M David Austgen, Gary T Rochelle, and Chau C Chen, "Model of Vapor-Liquid Equilibria for Aqueous Acid Gas-Alkanolamine Systems. 2. Representation of H2S and CO2 Solubility in Aqueous MDEA and CO2 Solubility in Aqueous Mixtures of MDEA with MEA or DEA," Industrial & Engineering Chemistry Research, vol. 30, no. 3, pp. 543-555, March 1991.




DOI: http://dx.doi.org/10.12962/j23378557.v1i1.a437

Refbacks

  • There are currently no refbacks.


Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License. IPTEK The Journal of Engineering published by Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember

 

Please contact us for order or further information at: email: iptek.joe[at]gmail.com Fax/Telp: 031 5992945. Editorial Office Address: Pusat Riset Building 6th floor, ITS Campus, Sukolilo, Surabaya 60111, Indonesia.