Pressure condition | Highest temperature/˚C | Dosage of catalyst | Reaction time/h | Dehydration rate/% | Emulsion in condenser pipes |
Normal pressure | 150 | 1% | 12 | 45.8% | Yellow emulsion |
From normal pressure to reduced pressure | 150 | 1% | 10 | 74.4% | Trace amounts of yellow emulsion |
Reduced pressure | 150 | 1% | 8 | 20.4% | A lot of yellow emulsion |