Table 3.

The experimental data of KTZ solubility in SC-CO₂ – menthol based on distinct conditions.

Temperaturea (K)	Pressurea (MPa)	Menthol	Ternary
		y3 × 103	y′2 × 104 (Mole Fraction )	Standard deviation of the mean, SD ($\overline{y^{\prime }}$) × 104	Expanded uncertainty of mole fraction (104 U)	E (cosolvent effect)
308	12	16.40	0.27	0.003	0.014	16.1
	15	17.32	0.38	0.001	0.017	9.7
	18	18.69	0.43	0.003	0.020	9.4
	21	19.43	0.46	0.005	0.022	9.7
	24	20.43	0.54	0.003	0.024	6.8
	27	22.17	0.59	0.002	0.026	5.3
	30	23.63	0.62	0.008	0.032	4.9
318	12	14.70	0.21	0.001	0.010	30.6
	15	16.32	0.39	0.003	0.019	12.3
	18	17.34	0.53	0.008	0.029	11.1
	21	19.42	0.69	0.003	0.031	7.7
	24	21.09	0.87	0.003	0.039	5.2
	27	24.34	1.02	0.007	0.047	4.0
	30	26.36	1.11	0.009	0.051	3.3
328	12	12.36	0.18	0.005	0.013	45.9
	15	15.84	0.41	0.006	0.023	16.6
	18	18.45	0.63	0.005	0.030	11.5
	21	19.94	0.90	0.008	0.043	5.9
	24	22.34	1.12	0.004	0.050	3.9
	27	26.34	1.31	0.009	0.060	3.5
	30	29.70	1.65	0.017	0.080	2.9
338	12	12.09	0.12	0.003	0.008	61.2
	15	16.12	0.45	0.001	0.020	34.4
	18	19.18	0.76	0.003	0.034	11.6
	21	25.33	1.01	0.015	0.054	5.5
	24	24.59	1.34	0.020	0.072	3.7
	27	30.82	1.70	0.017	0.082	2.8
	30	32.87	1.96	0.025	0.100	2.4

y₃, y^'₂ and e are mole fraction of menthol, mole fraction of solute in ternary system and cosolvent effect, respectively. The experimental standard deviation of the mean (SD) were obtained by $SD(\overline{y})=\frac{S(y_k)}{\sqrt{n}}$. 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 = $\sqrt{\sum _{i=1}^N{(P_{i}u(x_i)/x_i)}^2}$ 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.

^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.