Solid-Liquid Phase Equilibria of the Quaternary System NaCl + NH₄Cl + NaHCO₃ + NH₄HCO₃ + H₂O at 283.15 and 313.15 K

Table 4

Physicochemical properties in the quaternary system (NaCl + NH₄Cl + NaHCO₃ + NH₄HCO₃ + H₂O) at T = 283.15, 313.15 K, and  = 0.1 MPa^a.

No.^b	Composition of liquid phase, 100 ^c				nD			ρ/g·cm^−3			Solid phase^e
	NaCl	NaHCO3	NH4Cl	NH4HCO3	Experimental value	Calculated value	Relative error^d, (%)	Experimental value	Calculated value	Relative error, (%)
283.15 K
1, A	26.41	0.43	0.00	0.00	1.3821	1.3834	0.09	1.20854	1.21093	0.20	S + SB
2	23.78	0.00	3.95	0.26	1.3857	1.3854	−0.02	1.19978	1.19819	−0.13	S + SB
3	20.07	0.00	9.78	0.24	1.3904	1.3891	−0.09	1.18868	1.18684	−0.15	S + SB
4, F1	18.95	0.00	12.48	0.38	1.3928	1.3921	−0.05	1.18283	1.18737	0.38	S + SB + A
5	11.72	0.00	16.32	0.59	1.3890	1.3872	−0.13	1.13848	1.14170	0.28	A + SB
6	6.92	0.00	21.28	1.17	1.3872	1.3886	0.10	1.11980	1.12222	0.22	A + SB
7, F2	6.01	0.00	24.19	1.82	1.3926	1.3929	0.02	1.12987	1.12756	−0.20	A + AB + S
8, B	18.34	0.00	12.62	0.00	1.3917	1.3908	−0.07	1.17954	1.18081	0.11	A + S
9, C	0.00	0.00	15.14	13.23	1.3855	1.3841	−0.10	1.08540	1.10545	1.85	A + B
10	0.00	0.96	21.66	3.29	1.3859	1.3827	−0.23	1.087480	1.09030	0.26	A + B
11, D	0.00	5.08	0.00	10.76	1.3609	1.3639	0.22	1.09549	1.10377	0.76	AB + SB
12	0.00	1.99	1.15	12.57	1.3638	1.3638	0.00	1.09183	1.08075	−1.01	AB + SB
13	0.00	4.57	6.72	3.98	1.3674	1.3648	−0.19	1.09244	1.08736	−0.47	AB + SB
14	2.45	0.00	8.28	6.01	1.3673	1.3666	−0.05	1.09798	1.06906	−2.63	AB + SB
15	5.11	0.00	15.34	2.51	1.3748	1.3777	0.21	1.10381	1.09535	−0.77	AB + SB
16	5.32	0.00	17.71	2.17	1.3800	1.3815	0.11	1.10936	1.10288	−0.58	AB + SB
17	6.06	0.00	23.03	2.09	1.3883	1.3914	0.22	1.12209	1.12548	0.30	AB + SB
313.15 K
1, A′	26.11	0.98	0.00	0.00	1.3781	1.3777	0.03	1.19942	1.19055	−0.74	S + SB
2	26.43	0.39	0.85	0.00	1.3784	1.3790	−0.05	1.19351	1.19313	−0.03	S + SB
3	24.85	1.25	2.47	0.00	1.3806	1.3806	0.00	1.18941	1.18918	−0.02	S + SB
4	22.33	1.65	6.99	0.00	1.3845	1.3852	−0.05	1.18044	1.18451	0.34	S + SB
5	20.91	1.98	8.55	0.00	1.3857	1.3859	−0.02	1.17921	1.17928	0.01	S + SB
6, F1′	15.44	3.10	18.30	0.00	1.3966	1.3964	0.02	1.16432	1.17014	0.50	S + SB + A
7	14.52	0.00	21.61	1.08	1.3966	1.3970	−0.03	1.16495	1.16361	−0.12	SB + A
8	14.37	0.00	21.82	1.04	1.3967	1.3970	−0.02	1.16462	1.16291	−0.15	SB + A
9	11.77	0.00	23.81	1.41	1.3957	1.3960	−0.02	1.15107	1.14978	−0.11	SB + A
10, F2′	4.25	0.00	31.98	5.02	1.4015	1.4030	−0.11	1.13739	1.12932	−0.71	SB + AB + A
11, B′	15.05	0.00	20.00	0.00	1.3954	1.3927	0.20	1.15755	1.15869	0.10	S + A
12, C′	0.00	0.00	29.18	10.89	1.3993	1.3986	0.05	1.10419	1.11075	0.59	AB + A
13, D′	0.00	6.17	0.00	26.97	1.3797	1.3805	−0.05	—^f	1.11204	—	AB + SB
14	4.45	6.21	0.00	21.31	1.3803	1.3798	0.04	—	1.12491	—	AB + SB
15	4.55	6.54	0.00	29.95	1.3981	1.3977	0.03	—	1.16039	—	AB + SB

^aStandard uncertainties u, u (T) = 0.1 K, u (p) = 0.005 MPa (ambient pressure change), u_r ( (NaCl)) = 0.003, u_r ( (NaHCO₃)) = 0.003, u_r ( (NH₄Cl)) = 0.003, u_r ( (NH₄HCO₃)) = 0.003, u (ρ) = 1.0 mg·cm⁻³, u (n_D) = 0.0010. ^bThe points correspond to those in Table 2^c, mass fraction. ^dRelative error = 100% × (calculated value−experimental value)/experimental value. ^eA: NH₄Cl, S: NaCl, AB: NH₄HCO₃, SB: NaHCO₃. ^f—, not determined.