Table 5. Coefficients of Equilibrium Constants Estimated in the Present Work^a.

system	aq (MDEA + 2-MPZ)		aq ([bmim] [Ac] + 2-MPZ)				aq (TMSO2 + 2-MPZ)
Ki/kmol.m–3	K4	K5	K4	K5	K6	K7	K4	K5
G	–3.216 × 10–8	4.174×105	–9.782 × 10–9	–2.485×103	–9.795 × 10–9	–2.513×103	2.586 × 10–5	–5.439×104
H	–1.261 × 10–9	9.951 × 10	–4.436 × 10–9	–4.826×103	–4.436 × 10–9	–4.840×103	–2.399 × 10–5	–5.814 × 10
K	1.024 × 10–10	5.933 × 10	6.745 × 10–11	–5.974 × 10	6.740 × 10–11	–5.990 × 10	2.492 × 10–8	5.817×103
L	6.755 × 10–12	–3.978	–2.327 × 10–11	–1.627×103	–2.328 × 10–11	–1.619×103	–7.333 × 10–9	–4.496×102
N	2.168 × 10–14	–5.624	2.612 × 10–13	5.822	2.597 × 10–13	5.830	–5.254 × 10–11	–1.541 × 10
P	–7.678 × 10–13	–3.410 × 10–2	1.131 × 10–10	–5.177 × 10–2	1.132 × 10–10	–5.164 × 10–2	9.969 × 10–10	–2.062 × 10
Q	2.728 × 10–14	1.885 × 10–2	1.555 × 10–24	9.442×102	1.563 × 10–24	9.453×102	–3.294 × 10–13	1.014×103
R		–1.799 × 10–4		–1.359 × 10–3		–1.388 × 10–3		–7.680 × 10–2
% AAD	7.53			22.49			31.94

^aThe competency of the modified KE model for prediction of CO₂ solubility is also presented in terms of residual plots for the aq (MDEA + 2-MPZ) system in Figure 3.