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Title: Solubility of Carbon Dioxide (CO2) in Protonated Aqueous Methyldiethanolamine (MDEA) Solutions and Diethanolamine (DEA) Solutions
Authors: Noor Yassin Farraj 
Supervisor: Prof. Mousa K. Abu-Arabi
Keywords: Solubility : Diethanolamine
Issue Date: 2018
Publisher:  Kuwait university - college of graduate studies
Abstract: Aqueous solutions of alkanolamines are used to remove CO2 from natural or synthetic gases through an absorption process. The absorption of CO2 in aqueous amines occurs chemically and physically, giving what is called total loading. It is important in designing absorption equipment to have data on the physically absorbed CO2 in the intended aqueous alkanolamine as well as the total loading. In this work, the protonation method is used to measure the physical solubility of CO2 in two aqueous solutions of diethanolamine (DEA) and methyldiethanolamine (MDEA) at atmospheric pressure over a temperature range of (25-60) ⁰C. The main principle of the method used is the protonation of pure DEA and MDEA by 37% HCl solution to eliminate the chemical absorption part of CO2 upon contacting with the alkanolamine solution. The solubility of CO2 is measured in both protonated solutions without adding water. A formula is developed to calculate the solubility of CO2 in the two aqueous solutions from its solubility in water and in DEA or MDEA after being protonated. The results obtained for the solubility in this work are compared with previous work found in the open literature that use the N2O analogy method to estimate the CO2 solubility. The results reveal that there is good agreement between this method and the N2O analogy, but deviates at high temperature and concentrations of alkanolamine, mainly for tertiary alkanolamines like MDEA. The solubility of CO2 calculated in aqueous solutions of concentrations 10, 20, and 30 mass % protonated DEA and 20, 30 and 40 mass % of protonated MDEA are modeled in term of temperature. The validity of the developed formula is also checked using data from the literature on solubility of CO2 in aqueous monoethanolamine (MEA) solutions.
Appears in Programs:0640 Chemical Engineering

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