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Reaction kinetics of carbon dioxide with amines in non-aqueous solvents

1986; Elsevier BV; Volume: 33; Issue: 2 Linguagem: Inglês

10.1016/0300-9467(86)80038-7

1873-5541

Eizô Sada, H. Kumazawa, Yosuke Osawa, Mikiya Matsu-ura, Zhenfu Han,

Phase Equilibria and Thermodynamics

The rates of absorption of carbon dioxide into aqueous and non-aqueous solutions of monoisopropanolamine and cyclohexylamine were measured using a semibatch stirred tank with a plane gas-liquid interface at 303 K. The absorption rates under the fast reaction regime were analysed using chemical absorption theory. It was found that the order of reaction with respect to carbon dioxide was unity in every solution system, whereas the order of reaction with respect to mono-isopropanolamine was unity for an aqueous solution and had a value between 1.46 and 1.93 for the other alcoholic solution systems, as in the monoethanolamine case. The dependence of the logarithms of the reaction rate parameters included in the reaction scheme via a zwitterion on the solubility parameter of the solvent was found to be approximately linear, as in the ethanolamine case. The order of reaction with respect to cyclohexylamine was almost unity for aqueous and alcoholic solutions and 2 for toluene solution. The dependence of the logarithms of the second-order reaction rate constants in aqueous and alcoholic solutions on the reciprocal of the dielectric constant of the solvent was found to be approximately linear.