Viscosity of 2-ethylhexan-1-amine (EHA)-diglyme, EHA-triglyme and EHA-tetraglyme non-aqueous solutions and its effect on initial absorption rate

摘要

The viscosities (eta) of 2-ethylhexan-1-amine (EHA), diglyme, triglyme, tetraglyme and EHA-diglyme/triglyme/ tetraglyme non-aqueous solutions were measured by using the NDJ-5S rotational viscometer at 101 kPa. The temperatures (T) ranged from 303.2 K to 323.2 K. The mass fractions of EHA (W-EHA) ranged from 0.100 to 0.900. The viscosity was modeled and the calculated results agreed well with the experiments. The effects of W-EHA and Ton viscosity were demonstrated on the basis of experiments and calculations. The initial absorption rates of CO2 (r) in EHA-diglyme/triglyme/tetraglyme non-aqueous solutions were measured, and the effects of viscosity, absorbent concentration and absorption rate constant of CO2 (k) on initial absorption rates were demonstrated. Our research shows that in the temperature range of 303.2 K to 323.2 1<, the proposed three nonaqueous absorbents have small solution viscosities (<3 mPa . s), which is beneficial to the mass transfer of CO2 absorption and the initial absorption rate. Thus the proposed non-aqueous absorbents have good application potential in the field of CO(2 )capture process. (C) 2020 Elsevier B.V. All rights reserved.