Density, Viscosity and Solubility of Carbon Dioxide in Aqueous Blends ofDiethanolamine and 2-Amino-2-Hydroxymethyl-1, 3-Propanediol

In this study, solubility of carbon dioxide (C02) in new aqueous blends of
diethanolarnine (DEA) + 2-amino-2-hydroxymethyl-1, 3-propanediol (AHPD) was
carried out at temperatures of (303 K and 333 K) and C02 partial pressure ranging from
(I 00 - 2000 kPa). The total aqueous blends amine mass fraction was kept within 30 wt%
in all solutions, varies at (30 wt"/o DEA + 0 wt% AHPD), (20 wt% DEA + 10 wt%
AHPD), (10 wt% DEA + 20 wt% AHPD) and (0 wt"lo DEA + 30 wt% AHPD). The
results show higher C02 loading capacity is achieved when the system is operated at
lower temperature and at higher C02 partial pressure. At a fixed temperature, an
increase in mass fraction of AHPD in the aqueous blends solution leads to higher COz
loading capacity. C02 loading capacity was found highest in the blends of I 0 wt% DEA
+ 20 wt% AHPD at 1680 kPa and 303 K, which is 1.2814 mol of C02/ mol of absorbent.
Physical properties such as density and viscosity ofDEA + AHPD are also measured at
temperature of (303 K- 333 K).