Continuous absorption of CO2 in packed column using MDEA solution for biomethane preparation

2nd International Conference on Chemical Engineering (ICCE) UNPAR

Mindaryani, A.^1 ; Budhijanto, W.^1 ; Ningrum, S.S.^1

Chemical Engineering Department, Universitas Gadjah Mada, Yogyakarta, Indonesia^1

关键词: Absorption columns;    Combustion efficiencies;    Overall mass transfer coefficient;    Renewable energies;    Small and medium scale industries;    Solution concentration;    Solution flow rate;    Steady state process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/162/1/012006/pdf
DOI  :  10.1088/1757-899X/162/1/012006

来源: IOP

【 摘 要 】

Nowadays, the energy consumption in Indonesia is increasing. Raising of energy consumption force Indonesia to find other energy resources. Biogas is one of the renewable energy, which was developed in anticipation to the fossil energy reduction. Reducing the content of impurities in biogas may reduce the corrosion impact and increase the combustion efficiency. The biomethane can be utilised as fuel for generator in small and medium scale industries (IKM). Continuous CO2absorption in packed column using MDEA solution as absorbent is studied for biomethane preparation. CO2absorption experiments was performed continuously in the packed absorption column with a diameter of 6 cm and 75 cm length. Gas is sparged from the bottom of the column while the liquid is pumped through the top of the column. The concentration of CO2at exit gas is analysed by GC and recorded as a function of time. The flowrate of the inlet gas was varied at 1 LPM; 1.5 LPM; and 1.8 LPM. Variation of MDEA solution concentration used was 20% and 35.31%. Mathematical model for unsteady state CO2absorption in packed column was developed. The reaction rate constant (k) and mass transfer coefficient KGa were determined by fitting the outlet CO2concentration data as a function of time to the model solution with smallest Sum of Square of Errors (SSE). The experimental data shows that absorption of 1 LPM gas flow rate with 0,15 LPM MDEA solution flow rate may reduce 40 % CO2to be 17 % CO2in outlet gas. The steady state process reaches at 10 minutes. Increasing gas flow rates shows the higher overall mass transfer coefficient. The reaction rate constant is not affected by gas flow rate variation.