Table 3. Optimization results of three component surfactant system containing different weight ratios of Emulpon CO-360, Tergitol L-61, and Rhodafac RE-610.
| ETR ratio (w/w/w) | Appearance | Stability at 4°C | Cloud point (°C)z | |
|---|---|---|---|---|
| 0 h | 4 h | |||
| 6:1:1 | Transparent | Transparent | Transparent | >70 |
| 6:2:1 | Transparent | Phase separation | Transparent | >70 |
| 6:3:1 | Transparent | Transparent | Phase separation | >70 |
| 2:6:1 | Turbid | Not tested | Not tested | Not tested |
| 3:6:1 | Turbid | Not tested | Not tested | Not tested |
| 4:6:1 | Semitransparent | Phase separation | Not tested | Not tested |
z cloud point is the temperature at which the sample became turbid, which was determined by increasing the temperature of a water bath.