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Received January 17, 2006
Accepted March 16, 2006
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Absorption of carbon dioxide into non-aqueous solutions of N-methyldiethanolamine
Division of Chemical Engineering, Pusan National University, Busan 609-735, Korea 1Department of Chemical Engineering, Sogang University, Seoul 121-742, Korea
swpark@pusan.ac.kr
Korean Journal of Chemical Engineering, September 2006, 23(5), 806-811(6), 10.1007/BF02705932
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Abstract
The chemical absorption rate of carbon dioxide was measured in non-aqueous solvents, which dissolved N-methyldiethanoamine (MDEA), such as methanol, ethanol, n-propanol, n-butanol, ethylene glycol, propylene glycol, and propylene carbonate, and water at 298 K and 101.3 kPa using a semi-batch stirred tank with a plane gas-liquid interface. The overall reaction rate constant obtained from the measured rate of absorption of carbon dioxide under the condition of fast pseudo-first-order reaction regime was used to get the apparent reaction rate constant, which yields the second-order reaction rate constant and the reaction order of the overall reaction. There was approximately linear dependence of the logarithm of the rate constant for the overall second-order reaction on the solubility parameter of the solvent. In non-aqueous solutions of (MDEA), dissolved carbon dioxide is expected to react with solvated (MDEA) to produce an ion pair.
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