SDS Volume (3015)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Sarbaev, A. N.; Polyakov, E. V.; Polyakova, Z. A.; Ruchkova, A. Kh.; Tyunina, M. F.; Gushchina, L. I.; Mart'yanova, L. I.; Khim. Prom. (Moscow) 1974, 50, 516.
Variables:
Composition and temperature in solutions with N/P2O5 ratios of 2:1 and 3:1.
Prepared by:
Method/Apparatus/Procedure:
The method has been described earlier [1].
Source and Purity of Materials:
- $\ce{CO(NH2)2}$ was GOST 6691-67; $\ce{NH4H2PO4}$ was GOST 3771-64. No other information is given.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
References
1
Krichevskiy, I. R.; Khazanova, N. E.; Liushic, L. R.; Zh. Fiz. Khim. 1957, 31, 2711.
2
Blidin, V. P.; Zh. Obshch. Khim. 1941, 11, 887.
3
Polyakov, E. V.; Mart'yanova, L. I.; Sarbaev, A. N.; Zh. Prikl. Khim. 1974, 47, 1507.
Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Urea, $\ce{ CH4N2O }$; [57-13-6] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
The authors report the data found in Refs. 2 and 3. In addition, they report their own data at temperatures above 40°C. These data are presented with temperature and the total content of salt components as the coordinates. The compiler has recalculated their data as follows. According to the authors, decomposition of urea occurs at temperatures above 70°C.
Table II. Solubility data for the NH4H2PO4-CO(NH2)2-H2O system in solutions having a N/P2O5 ratio of 3:1.
| $T$ (°C) | 100w1 | 100w2 | 100w3 | 100w4 | m2 (mol/kg) | m3 (mol/kg) |
|---|---|---|---|---|---|---|
| 40 | 69.2 | 11.2 | 58.0 | 30.8 | 3.16 | 31.4 |
| 50 | 73.3 | 11.8 | 61.5 | 26.7 | 3.84 | 38.3 |
| 60 | 77.1 | 12.5 | 64.6 | 22.9 | 4.75 | 47.0 |
| 70 | 79.3 | 12.8 | 66.5 | 20.7 | 5.38 | 53.5 |
| 80 | 82.4 | 13.3 | 69.1 | 17.6 | 6.57 | 65.4 |
| 90 | 86.3 | 13.9 | 72.4 | 13.7 | 8.82 | 87.9 |
| 100 | 90.9 | 14.7 | 76.2 | 9.1 | 14.0 | 139.4 |
