Table 2 The experimental data of KTZ solubility in SC-CO₂ based on distinct conditions (The experimental standard deviation and the experimental standard deviation of the mean (SD) were obtained by \(S({y_k}) = \sqrt {\frac{{\sum\limits_{j = 1}^n {{{({y_j} - \bar y)}^2}} }}{n - 1}} \) and \(SD(\bar y) = \frac{{S({y_k})}}{\sqrt n }\) respectively.

Temperature^a (K)	Pressure^a (MPa)	Density^b (kg/m³)			Binary
Temperature^a (K)	Pressure^a (MPa)	Density^b (kg/m³)	y₂ × 10⁵ (Mole Fraction )	Standard deviation of the mean, SD(ȳ) × (10⁵)	Expanded uncertainty of mole fraction (10⁵ U)	S (Solubility (g/l))
308	12	768.42	0.17	0.001	0.008	0.016
	15	816.06	0.34	0.003	0.016	0.034
	18	848.87	0.44	0.017	0.039	0.045
	21	874.4	0.62	0.017	0.044	0.066
	24	895.54	0.80	0.034	0.077	0.087
	27	913.69	0.94	0.017	0.054	0.104
	30	929.68	1.09	0.051	0.114	0.122
318	12	659.73	0.07	0.003	0.007	0.006
	15	743.17	0.32	0.010	0.027	0.036
	18	790.18	0.85	0.034	0.079	0.081
	21	823.7	1.31	0.035	0.090	0.130
	24	850.1	1.68	0.069	0.157	0.173
	27	872.04	2.11	0.035	0.115	0.222
	30	890.92	2.59	0.086	0.207	0.279
328	12	506.85	0.04	0.001	0.003	0.003
	15	654.94	0.30	0.002	0.015	0.026
	18	724.13	0.98	0.035	0.082	0.086
	21	768.74	1.82	0.052	0.131	0.169
	24	801.92	2.76	0.050	0.160	0.267
	27	828.51	4.02	0.087	0.247	0.402
	30	850.83	4.81	0.068	0.252	0.494
338	12	384.17	0.02	0.0006	0.001	0.001
	15	555.23	0.22	0.010	0.023	0.015
	18	651.18	0.90	0.017	0.056	0.077
	21	709.69	2.29	0.052	0.145	0.196
	24	751.17	4.2	0.032	0.198	0.381
	27	783.29	6.02	0.085	0.316	0.569
	30	809.58	8.02	0.121	0.427	0.784

n is the number of times each experimental data was measured (n = 3, in this work). Expanded uncertainty is U = k* u_combined and the relative combined standard uncertainty is defined as u_combined / y = \(\sqrt {\sum\limits_{i = 1}^N {{{({P_i}{\kern 1pt} u({x_i})/{x_i})}^2}} } \) in which u(x_i)/x_i is the relative standard uncertainty of each input estimate (x_i) and P_i is known positive or negative number having negligible uncertainties. y₂ and S are mole fraction of solute in binary system and solubility of solute in SC-CO₂, respectively.
^aStandard uncertainty u are u(T) = 0.1 K; u(p) = 1 bar. Also, the relative standard uncertainties are obtained below 0.05 for mole fractions and solubilities. The value of the coverage factor k = 2 was chosen on the basis of the level of confidence of approximately 95 percent.
^bData from the Span–Wagner equation of state⁶².

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