Table 2 The APZ solubility at distinctive operational conditions (12–30 MPa) and (308–338 K).

Temperature (K)^a	Pressure (MPa)^a	Density (kg.m⁻³)^b	Y₂ × 10⁵ (Mole Fraction)	Standard deviation of the mean, SD(ȳ) × (10⁵)	Expanded uncertainty × 10⁶	S × 10 (Solubility (g.l⁻¹))
308	12	768.42	0.303	0.015	0.306	0.237
	15	816.06	0.391	0.026	0.526	0.325
	18	848.87	0.467	0.022	0.450	0.404
	21	874.4	0.513	0.034	0.688	0.457
	24	895.54	0.569	0.050	1.007	0.520
	27	913.69	0.634	0.064	1.287	0.591
	30	929.68	0.679	0.079	1.586	0.644
318	12	659.73	0.262	0.012	0.246	0.176
	15	743.17	0.357	0.023	0.466	0.270
	18	790.18	0.471	0.031	0.627	0.379
	21	823.7	0.573	0.050	1.007	0.481
	24	850.1	0.675	0.079	1.586	0.585
	27	872.04	0.741	0.072	1.448	0.659
	30	890.92	0.801	0.090	1.807	0.727
328	12	506.85	0.231	0.007	0.148	0.119
	15	654.94	0.304	0.021	0.425	0.203
	18	724.13	0.496	0.025	0.510	0.366
	21	768.74	0.643	0.048	0.969	0.504
	24	801.92	0.759	0.073	1.468	0.620
	27	828.51	0.847	0.086	1.729	0.716
	30	850.83	0.913	0.077	1.551	0.792
338	12	384.17	0.183	0.006	0.126	0.072
	15	555.23	0.258	0.017	0.344	0.146
	18	651.18	0.499	0.043	0.866	0.331
	21	709.69	0.699	0.056	1.129	0.506
	24	751.17	0.877	0.078	1.570	0.671
	27	783.29	0.958	0.095	1.910	0.764
	30	809.58	1.036	0.120	2.409	0.855

The experimental standard deviation of the mean (SD) were obtained by \(SD\left(\overline{y }\right)=\frac{s\left({y}_{k}\right)}{\sqrt{n}}\) . 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 =\(\sqrt{\sum_{i=1}^{N}\,{(\mathrm{Pi\,u}(\mathrm{xi})/\mathrm{xi})}^{2}}\) in which u(xi)/xi is the relative standard uncertainty of each input estimate (xi) 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 solubility’s. The value of the coverage factor k = 2 was chosen on the basis of the level of confidence of approximately 95 percent. Data from the Span–Wagner equation of state.

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