2014 : Prediction of Gas-Liquid Equilibria of CO2-K2CO3-MDEA-H2O System by Electrolyte UNIQUAC Model

Prof.Ir. Ali Altway M.Sc
Prof.Dr.Ir. Kuswandi DEA


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 CO 2 from the gas stream. Chemical absorption is the most economical method for CO 2 separation. One of the processes that is widely used in industries is Benfield process with K 2 CO 3 (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 CO 2 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 CO 2-K 2 CO 3-MDEA-H 2 O system at 30 o C and atmospheric pressure with 30% K 2 CO 3 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 CO 2 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 CO 2 partial pressure, CO 2 loading increased, and also at the same partial pressure of CO 2, CO 2 loading increased with the increase of weight percent of MDEA