Distillation column startup
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When starting up a distillation column under negative pressure, should vacuum be created first and then heating applied, or should heating be carried out first and then vacuum created? Please explain from aspects such as safety and technology.
It is safer to evacuate the vacuum first before heating
Of course, vacuum should be created first and then heating should take place. The reason for breaking the vacuum only after the temperature has dropped is to prevent air from entering and forming an explosive mixture.
Vacuum first, then the distillation tower. . . . . .
Of course, first evacuate the air, then conduct a airtightness test; after heating, carry out another airtightness test and tighten the connections, all in order to prevent leaks inside the tower that could lead to the formation of an explosive mixture. The autoignition temperatures of oils are very low. !
1. Perform vacuum pumping and vacuum maintenance tests until satisfactory results are achieved. 2. Fill with liquid. 3. Introduce steam. 4. Establish full reflux and adjust for stability
If the heating time is long, the two can be carried out simultaneously
First, evacuate the space – for example, wait until the pressure reaches below -0.098 before heating. This is our method of operation; isn’t it right?
When the pressure decreases, the material will flash vaporize