Design of protonation constant measurement apparatus for carbon dioxide capturing solvents

2nd International Conference on Chemical Engineering (ICCE) UNPAR

Ma'Mun, S.^1 ; Amelia, E.^1 ; Rahmat, V.^1 ; Alwani, D.R.^1 ; Kurniawan, D.^1

Department of Chemical Engineering, Islamic University of Indonesia, Jl. Kaliurang Km. 14.5, Yogyakarta

55501, Indonesia^1

关键词: Carbon dioxide emissions;    Chemical equilibrium constant;    Coal-fired power plant;    Greenhouse gases (GHG);    Iron and steel productions;    Measurement apparatus;    Post-combustion captures;    Potentiometric titration methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/162/1/012003/pdf
DOI  :  10.1088/1757-899X/162/1/012003

来源: IOP

【 摘 要 】

Global warming phenomenon has led to world climate change caused by high concentrations of greenhouse gases (GHG), e.g. carbon dioxide (CO2), in the atmosphere. Carbon dioxide is produced in large amount from coal-fired power plants, iron and steel production, cement production, chemical and petrochemical manufacturing, natural gas purification, and transportation. Carbon dioxide emissions seem to rise from year to year; some efforts to reduce the emissions are, therefore, required. Amine-based absorption could be deployed for post-combustion capture. Some parameters, e.g. mass transfer coefficients and chemical equilibrium constants, are required for a vapor-liquid equilibrium modeling. Protonation constant (pKa), as one of those parameters, could then be measured experimentally. Therefore, an experimental setup to measure pKa of CO2capturing solvents was designed and validated by measuring the pKaof acetic acid at 30 to 70 °C by a potentiometric titration method. The set up was also used to measure the pKaof MEA at 27 °C. Based on the validation results and due to low vapor pressure of CO2capturing solvents in general, e.g. alkanolamines, the setup could therefore be used for measuring pKaof the CO2capturing solvents at temperatures up to 70 °C.