Solid-Liquid Phase Equilibria for the Ternary System KNO3 + KH2PO4 + H2O at 283.15, 298.15, and 313.15 K
Table 2
Mass fraction solubility of the ternary KNO3 (1) + KH2PO4 (2) + H2O system at the temperatures of 283.15, 298.15, and 313.15 K and the pressure of 0.1 MPaa.
Number
Composition of liquid phase, 100 b
Composition of wet residue phase, 100
Equilibrium solid phase
100
100
100
100
283.15 K
1
17.29
0.00
NDc
ND
KNO3
2
16.43
1.94
47.40
1.35
KNO3
3
15.46
3.95
48.59
2.53
KNO3
4
14.73
5.81
49.91
3.54
KNO3
5
13.92
7.92
48.15
4.89
KNO3
6
13.34
9.33
49.28
16.68
KH2PO4 + KNO3
7
13.34
9.33
14.92
44.48
KH2PO4 + KNO3
8
11.85
9.94
7.27
44.99
KH2PO4
9
9.72
10.87
5.83
46.93
KH2PO4
10
7.00
11.98
4.45
44.73
KH2PO4
11
4.70
12.89
3.13
42.97
KH2PO4
12
2.51
13.90
1.63
45.32
KH2PO4
13
0.00
15.35
ND
ND
KH2PO4
298.15 K
1
0.00
20.05
ND
ND
KH2PO4
2
3.64
17.29
1.94
59.39
KH2PO4
3
7.52
15.19
3.76
58.47
KH2PO4
4
10.59
13.63
4.95
60.07
KH2PO4
5
14.60
11.91
6.83
58.97
KH2PO4
6
17.61
10.68
8.40
57.71
KH2PO4
7
20.41
9.68
10.09
55.69
KH2PO4
8
22.16
9.07
18.06
56.70
KH2PO4 + KNO3
9
22.16
9.07
53.23
16.34
KH2PO4 + KNO3
10
23.33
7.00
53.67
4.30
KNO3
11
24.33
4.97
55.24
3.03
KNO3
12
25.96
2.11
56.11
1.35
KNO3
13
27.25
0.00
ND
ND
KNO3
313.15 K
1
39.30
0.00
ND
ND
KNO3
2
37.37
2.53
60.69
1.68
KNO3
3
34.86
5.46
59.12
3.54
KNO3
4
33.22
7.50
55.24
18.96
KH2PO4 + KNO3
5
33.22
7.50
29.03
43.56
KH2PO4 + KNO3
6
31.14
8.42
17.18
49.62
KH2PO4
7
28.09
9.60
15.30
50.88
KH2PO4
8
25.40
10.56
14.61
48.53
KH2PO4
9
22.83
11.60
12.48
51.73
KH2PO4
10
19.95
12.85
11.54
49.62
KH2PO4
11
17.38
14.23
9.72
52.23
KH2PO4
12
14.55
15.75
8.09
53.33
KH2PO4
13
10.90
17.99
6.02
54.93
KH2PO4
14
7.31
20.09
3.95
56.95
KH2PO4
15
3.29
22.70
1.94
54.51
KH2PO4
16
0.00
25.32
ND
ND
KH2PO4
aStandard uncertainties u(T) = 0.3 K, ur(p) = 0.05, ur() = 0.01, and ur() = 0.01. b, mass fraction of KNO3; , mass fraction of KH2PO4; cND, not determined.
