Table 4. Densities ρ of Aqueous Solutions Containing MEA (2), HEIA (3), and CO₂ (4)^a.

						ρ/(g cm–3)
x2	x3	x4	α0	α1	α2	T = 298.15 K	T = 303.15 K	T = 313.15 K	T = 323.15 K	T = 333.15 K	T = 343.15 K	T = 353.15 K	T = 363.15 K
0.1128	0	0	0	0	0	1.0106	1.0083	1.0034	0.9981	0.9922	0.9857	–	–
0.1102	0	0.0235	0.213	0	0	1.0634	1.0609	1.0556	1.0502	1.0442	1.038	–	–
0.1091	0	0.0271	0.248	0	0	1.0667	–	1.0589	–	–	1.042	–	–
0.1076	0	0.0459	0.426	0	0	1.1113	1.1089	1.1039	1.0986	1.0927	1.0867	–	–
0.1062	0	0.0527	0.496	0	0	1.1171	–	1.1097	–	1.09841		–	–
0	1	0	0	0	0	–	–	–	–	1.2223	1.2179	1.2043	1.1997
0	0.2722	0	0	0	0	1.1811	1.1776	1.1704	1.1631	1.1557	1.1482	1.1405	–
0	0.1173	0	0	0	0	1.1153	1.1123	1.1061	1.0997	1.0929	1.0858	1.0772	–
0	0.0419	0	0	0	0	1.0527	1.0505	1.0457	1.0404	1.0338	–	–	–
0.1111	0.0130	0	0	0	0	1.0248	1.0224	1.0172	1.0116	1.0055	0.999	–	–
0.1078	0.0127	0.0297	0.275	0.248	0.225	1.0799	–	1.0723	–	–	1.0551	–	–
0.1047	0.0123	0.0576	0.55	0.495	0.450	1.1304	–	1.1229	–	–	–	–	–
0.1101	0.0278	0	0	0	0	1.0405	1.0379	1.0324	1.0265	1.0202	1.0134	–	–
0.1064	0.0266	0.0245	0.233	0.19	0.16	1.0927	1.0896	1.0838	1.0778	1.0719	1.0657	–	–
0.1067	0.0270	0.0304	0.285	0.228	0.19	1.0982	–	1.0902	–	1.0755	1.0724	–	–
0.1038	0.0259	0.0488	0.467	0.37	0.31	1.1369	1.1344	1.129	1.1233	–	–	–	–
0.1036	0.0262	0.0596	0.57	0.456	0.380	1.1369	–	1.1288	–	–	–	–	–

^ax_i is the mole fraction of component i in aqueous solution, T is temperature, and α_i (i = 0, 1, 2) are measures of the CO₂ loading as determined from the definitions in Table 3. Expanded uncertainties at 95% confidence for MEA aqueous solutions are U(T) = 0.02 K, U(α₀) = 0.03, U(x₂) = 0.0002, and U(ρ) = 0.0004 g cm^–3. Expanded uncertainties at 95% confidence for HEIA aqueous solutions are U(T) = 0.02 K, U(x₃) = 0.0002, and U(ρ) = 0.002 g cm^–3. Expanded uncertainties at 95% confidence for HEIA-MEA blend aqueous solutions are U(T) = 0.02 K, U(α₀) = U(α₁) = 0.01, U(α₂) = 0.0098, U(x₂) = U(x₃) = 0.0002, and U(ρ) = 0.0002 g cm^–3. All measurements were performed at a pressure of 0.1 MPa.