CHEMICAL EQUILIBRIA OF ABSORPTION OF C02 INTO NONAQUEOUS SOLUTION OF AMINE

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

ASASHI KITAMOTO¹  KENJI TAKESHITA¹ 

[1] Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

关键词: Gas Absorption;    Chemical Absorption;    Chemical Equilibrium;    Nonaqueous Solvent;    Amine;    Carbamic Acid;    Carbon Dioxide;   

DOI  :  10.1252/jcej.21.411

来源: Maruzen Company Ltd

【 摘 要 】

References(8)Cited-By(3)The moles of CO2 absorbed into an amine-nonaqueous solvent mixture were measured by using the stirred-cell method. The test solutions were the mixtures of amine such as butylamine, tert-butylamine, dibutylamine, diethylamine and dipropylamine, and solvents such as octane, triethylamine and methanol. The equilibria of the reactions between CO2 and amine in nonaqueous solvent were studied by examining the pressure dependency of the absorption of CO2 at lower temperatures, and could be described by the following reactions: CO2(1)+R2NH⇔R2NCO2H (1) R2NCO2H+R2NH⇔R2NCO2-R2NH2+ (2) R2NCO2H+R2NH⇔R2NCO2-+R2NH2+ (3)where R is the alkyl group. The equilibrium constants, K1, K2 and K3, were estimated simultaneously by the method of least squares with respect to the pressure dependency of the absorption of CO2. The equilibria of the reactions in a nonpolar solvent were mainly described by Eqs. (1) and (2). Those in a polar solvent were described by Eqs. (1) and (3). The proposed reactions, Eqs. (1) to (3), were supported by enthalpies estimated from the Arrhenius plot of the equilibrium constant.

【 授权许可】

Unknown