2
0
2017
shi
yin
0
journal
Original
Shi, X.-y.[Xin-ying]
Yin, J.-n.[Jian-nan]
Zhou, H.[Huan]
Gu, X.-l.[Xiao-long]
Dai, Y.-p.[Ya-ping]
Tang, J.-j.[Jing-jing]
J. Chem. Eng. Data
2017
2020-09-29
Solid Liquid Phase Equilibria of (Mg(H2PO2)2 + NaH2PO2 + H2O) and (Mg(H2PO2)2 + MgCl2 + H2O) Systems at 323.15 K
The thermodynamics phase equilibria of the aqueous ternary systems (Mg(H2PO2)2 + NaH2PO2 + H2O) and (Mg(H2PO2)2 + MgCl2 + H2O) at 323.15K were investigated via the classical isothermal solubility equilibrium method. The solubilities and densities of the equilibrated solution were determined. The species of solid phase were confirmed by using the Scherinemakers wet residue method and with the aid of X-ray powder diffraction testing. In accordance with the experimental data, the phase diagrams and density versus composition diagrams were constructed. Both ternary systems are of complex type with three-species solid-salts of [Na(H2PO2)2*H2O, Mg(H2PO2)2*6H2O, and double-salt NaMg(H2PO2)3], and four-species solid-salts of [hydrate Mg(H2PO2)2*6H2O, MgCl2*6H2O, dehydrate Mg(H2PO2)2, and double-salt species Mg2(H2PO2)2Cl2*6H2O] formed respectively in the corresponding system. The solubility of Mg(H2PO2)2 is very low in Na(H2PO2)2 aqueous solution but large in MgCl2 aqueous solution. Mg(H2PO2)2*6H2O will dehydrate and transform into Mg(H2PO2)2 in the concentrated MgCl2 aqueous solution.
Solid-liquid equilibrium
Phase diagram
Magnesium hypophosphite
Sodium hypophosphite
Magnesium chloride
10.1021/acs.jced.6b00828
3
62
1011-1017
1
InChI=1S/Na.H3O2P/c;1-3-2/h;3H2,(H,1,2)/q+1;/p-1
SIGUVTURIMRFDD-UHFFFAOYSA-M
sodium phosphinate
sodium hypophosphite (NaH2PO2)
H2NaO2P
1
Commercial source
1
99
3
Other types of titration
2
InChI=1S/Mg.2H3O2P/c;2*1-3-2/h;2*3H2,(H,1,2)/q+2;;/p-2
ARIXXGBZIGZIKW-UHFFFAOYSA-L
magnesium hypophosphite
magnesium phosphenite
magnesium phosphinate
phosphinic acid, magnesium salt
H4MgO4P2
1
Synthesized by the authors
1
99
3
Other types of titration
3
InChI=1S/2ClH.Mg/h2*1H;/q;;+2/p-2
TWRXJAOTZQYOKJ-UHFFFAOYSA-L
magnesium chloride
magnesium dichloride
Cl2Mg
1
Commercial source
1
99
3
Other types of titration
4
InChI=1S/H2O/h1H2
XLYOFNOQVPJJNP-UHFFFAOYSA-N
water
H2O
1
Commercial source
1
99.8
3
Estimated by the compiler
1
1
1
4
1
2
1
Principal objective of the work
EP
EP
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 1
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
1
Liquid
1
0
5
1
0.2243
4
1
0.0027
1
0.0145
3
1
0.2005
4
1
0.0025
1
0.0316
3
1
0.1836
4
1
0.0023
1
0.0562
3
1
0.1701
4
1
0.0021
1
0.0928
3
1
0.1524
4
1
0.002
2
1
1
4
1
2
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 2
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
1
Liquid
1
0.0928
3
1
0.1524
4
1
0.003
1
0.1284
4
1
0.0972
3
1
0.0028
1
0.1711
4
1
0.0542
3
1
0.0024
1
0.2185
4
1
0.0226
3
1
0.0014
1
0.2898
4
1
0.0054
2
1
0.0009
1
0.334
4
1
0.0022
2
1
0.0002
1
0.3957
4
1
0.0013
2
1
0.0001
1
0.433
4
1
0.0009
1
1
0.0001
1
0.45
4
1
0.0009
1
1
0.0001
1
0.4849
4
1
0.0008
1
1
0.0001
1
0.5147
4
1
0.0008
1
1
0.0001
1
0.5551
4
1
0.0008
1
1
0.0001
1
0.5717
4
1
0.0007
1
1
0.0001
3
1
1
4
1
2
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 3
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
1
Liquid
1
0.5717
4
1
0.0007
1
1
0.0007
1
0.5786
4
1
0
5
4
1
1
4
1
2
1
Principal objective of the work
EP
EP
1/11/2017
1
Mass density, kg/m3
Vibrating tube method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.3
4
2
Temperature, K
Liquid
323.15
5
1
Mass fraction
2
Liquid
2
Mass fraction
1
Liquid
1
0.2243
4
2
0
5
1
1167.5
5
1
0.7
1
0.2005
4
2
0.0145
3
1
1173
5
1
0.6
1
0.1836
4
2
0.0316
3
1
1176.2
5
1
0.5
1
0.1701
4
2
0.0562
3
1
1178.7
5
1
1.8
1
0.1524
4
2
0.0928
3
1
1180.4
5
1
1.2
1
0.1524
4
2
0.0928
3
1
1180.4
5
1
1.2
1
0.1524
4
2
0.0928
3
1
1180.4
5
1
1.2
1
0.0972
3
2
0.1284
4
1
1159.6
5
1
2
1
0.0542
3
2
0.1711
4
1
1156.4
5
1
2.5
1
0.0226
3
2
0.2185
4
1
1166.5
5
1
3
1
0.0054
2
2
0.2898
4
1
1209.3
5
1
4.2
1
0.0022
2
2
0.334
4
1
1245.7
5
1
3.8
1
0.0013
2
2
0.3957
4
1
1282.4
5
1
5.3
1
0.0009
1
2
0.433
4
1
1329.4
5
1
8.3
1
0.0009
1
2
0.45
4
1
1349.7
5
1
8.7
1
0.0008
1
2
0.4849
4
1
1377.4
5
1
6.9
1
0.0008
1
2
0.5147
4
1
1403.9
5
1
5.4
1
0.0008
1
2
0.5551
4
1
1426.2
5
1
4.9
1
0.0007
1
2
0.5717
4
1
1435.2
5
1
3.8
1
0.0007
1
2
0.5717
4
1
1435.2
5
1
3.8
1
0.0007
1
2
0.5717
4
1
1435.2
5
1
3.8
1
0
5
2
0.5786
4
1
1438.8
5
1
3.7
5
4
1
3
1
2
1
Principal objective of the work
EP
EP
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 1
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
3
Liquid
1
0
5
1
0.2243
4
1
0.0027
1
0.0015
2
1
0.2157
4
1
0.0026
1
0.0189
3
1
0.1973
4
1
0.0024
1
0.0242
3
1
0.1939
4
1
0.0024
1
0.059
3
1
0.193
4
1
0.0024
6
4
1
3
1
2
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 2
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
3
Liquid
1
0.059
3
1
0.193
4
1
0.0026
1
0.0831
3
1
0.1668
4
1
0.0024
1
0.1107
4
1
0.141
4
1
0.0021
1
0.1337
4
1
0.1353
4
1
0.0017
1
0.1555
4
1
0.1289
4
1
0.0016
1
0.174
4
1
0.1277
4
1
0.0016
1
0.194
4
1
0.1259
4
1
0.0015
1
0.209
4
1
0.1279
4
1
0.0016
1
0.2391
4
1
0.1305
4
1
0.0016
1
0.2629
4
1
0.1313
4
1
0.0016
7
4
1
3
1
2
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 3
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
3
Liquid
1
0.2629
4
1
0.1313
4
1
0.0084
1
0.2811
4
1
0.0956
3
1
0.0058
1
0.3217
4
1
0.0536
3
1
0.0021
1
0.3262
4
1
0.0519
3
1
0.0021
1
0.3355
4
1
0.0484
3
1
0.0013
1
0.3425
4
1
0.0485
3
1
0.0006
8
4
1
3
1
2
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 3
1
Temperature, K
Liquid
323.15
5
2
Pressure, kPa
Liquid
101.3
4
1
Mass fraction
3
Liquid
1
0.3425
4
1
0.0485
3
1
0.0101
1
0.3538
4
1
0.0277
3
1
0.0105
1
0.3612
4
1
0.0139
3
1
0.0111
1
0.3653
4
1
0.0056
2
1
0.0056
1
0.3732
4
1
0
5
9
4
1
3
1
2
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass density, kg/m3
Vibrating tube method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.3
4
2
Temperature, K
Liquid
323.15
5
1
Mass fraction
2
Liquid
2
Mass fraction
3
Liquid
1
0.2243
4
2
0
5
1
1167.5
5
1
2.4
1
0.2157
4
2
0.0015
2
1
1175.9
5
1
2.3
1
0.1973
4
2
0.0189
3
1
1202.2
5
1
2.1
1
0.1939
4
2
0.0242
3
1
1209.2
5
1
2.2
1
0.193
4
2
0.059
3
1
1229.4
5
1
1.4
1
0.1668
4
2
0.0831
3
1
1230
5
1
2.2
1
0.141
4
2
0.1107
4
1
1242.1
5
1
1.1
1
0.1353
4
2
0.1337
4
1
1254.7
5
1
2.6
1
0.1289
4
2
0.1555
4
1
1276.8
5
1
2.7
1
0.1277
4
2
0.174
4
1
1294
5
1
2.8
1
0.1259
4
2
0.194
4
1
1310.6
5
1
3.4
1
0.1279
4
2
0.209
4
1
1328.8
5
1
3.1
1
0.1305
4
2
0.2391
4
1
1353.4
5
1
3.2
1
0.1313
4
2
0.2629
4
1
1374
5
1
3.7
1
0.0956
3
2
0.2811
4
1
1366.4
5
1
4
1
0.0536
3
2
0.3217
4
1
1362.1
5
1
11.7
1
0.0519
3
2
0.3262
4
1
1368.7
5
1
11.8
1
0.0484
3
2
0.3355
4
1
1372.1
5
1
8.5
1
0.0485
3
2
0.3425
4
1
1383.2
5
1
8.6
1
0.0277
3
2
0.3538
4
1
1376.3
5
1
8.8
1
0.0139
3
2
0.3612
4
1
1368.9
5
1
9.8
1
0.0056
2
2
0.3653
4
1
1359.6
5
1
11.5
1
0
5
2
0.3732
4
1
1343.2
5
1
11.8
10
4
1
2
1
Principal objective of the work
EP
EP
1/4/2017
1
Mass fraction
Titration method
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 1
1
Temperature, K
Liquid
2
Pressure, kPa
Liquid
1
323.15
5
2
101.3
4
1
0.2243
4
1
0.0027
11
4
1
2
1
Principal objective of the work
EP
EP
1/4/2017
1
Mass density, kg/m3
Vibrating tube method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Mass fraction
2
Liquid
2
Pressure, kPa
Liquid
3
Temperature, K
Liquid
1
0.2243
4
2
101.3
4
3
323.15
5
1
1167.5
5
1
0.4
12
1
1
4
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
1
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 3
1
Temperature, K
Liquid
2
Pressure, kPa
Liquid
1
323.15
5
2
101.3
4
1
0.5786
4
1
0.0069
13
1
1
4
1
Principal objective of the work
EP
EP
1/4/2017
1
Mass density, kg/m3
Vibrating tube method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Mass fraction
1
Liquid
2
Pressure, kPa
Liquid
3
Temperature, K
Liquid
1
0.5786
4
2
101.3
4
3
323.15
5
1
1438.8
5
1
1.1
14
4
1
3
1
Principal objective of the work
MPG
MPG
1/4/2017
1
Mass fraction
Titration method
3
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal of intercomponent compound 3
1
Temperature, K
Liquid
2
Pressure, kPa
Liquid
1
323.15
5
2
101.3
4
1
0.3732
4
1
0.006
15
4
1
3
1
Principal objective of the work
EP
EP
1/4/2017
1
Mass density, kg/m3
Vibrating tube method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Mass fraction
3
Liquid
2
Pressure, kPa
Liquid
3
Temperature, K
Liquid
1
0.3732
4
2
101.3
4
3
323.15
5
1
1343.2
5
1
0.9