atmospheric and vacuum distillation
Thread Content
The top temperature during atmospheric and vacuum distillation doesn’t decrease; I’m seeking help from experts
I’m not sure about the specific details, but the most likely reasons are that the top reflux and mid-stage reflux aren’t functioning properly
For reference, compare the top reflux, the design flow rates and temperatures for various medium and short reflux scenarios with the current parameters. Let’s see what the problems are; of course, if the processing load is too high, it’s also difficult to keep the top temperature under control. Let’s analyze each specific issue individually; your description isn’t specific enough, so it’s difficult to provide a detailed analysis.
There are several situations: 1. The oil is light or the extraction rate at normal pressure is low; 2. The backflow in the middle section is insufficient or unevenly distributed; 3. The furnace temperature is too high or the amount of steam injected is excessive, resulting in an overly high top load
When there are no significant changes in the raw materials: if the temperature cannot be reduced, it means the load at the top of the tower is high; the reflux at the middle section and at the top of the tower is low. It’s also possible that the reflux at the middle section is low while the reflux at the top of the tower is high! You can try increasing the mid-section reflux! If the oil’s properties become lighter, this adjustment can be tried within a certain range!