Viscosity measurement of aqueous and non-aqueous amine solutions for CO2 capture

Abstract

The availability of reliable experimental viscosity data of CO2-loaded and non-loaded solutions is essential for accurate equipment design calculations and better simulation results in the CO2 capture process. This study aimed to measure the viscosity of different CO2-loaded and non-loaded carbon capture solvents for which there is limited or no data available in the literature. Viscosity is measured for non-aqueous ternary mixtures of DPA + MeOH + SULF, AMP + MeOH + SULF and aqueous 27wt% AMP + 13wt % PZ (CESAR-1) solutions at temperatures ranging from 239.15 K to 373.15 K. Viscosities are measured at constant shear rate at 400 kPas and each measurement is an average of 100 measuring points. Viscosities for non-aquous mixtures were measured at five different concentrations in which the amine mass fraction did not exeed 40 wt%. The maximum CO2 loading (α / mol CO2.mol amine-1 ) for DPA + MeOH + SULF solution was 0.68 while for CESAR-1 loading values were 0.15, 0.30, 0.45 and 0.6. at all temperature and concentrations studied,viscosity decreased with increasing temperature and increased with an increase in the CO2 Loading. Correlations based on Andrade viscosity Model, Setschenow-type equations, and weiland equation was used to fit measured data with good accuracies .