The product taken from the side stream of the distillation tower has a high content of heavy components; how can this level be reduced?
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The product taken from the side stream of the distillation tower has a high content of heavy components; how can this level be reduced?
1. Appropriately reduce heating to lower the temperature at the bottom of the tower. 2. Appropriately increase the reflux rate to lower the bottom temperature of the tower.
It depends on the production requirements; usually, both the parameters at the bottom and top of the tower need to be met, and this can be achieved by increasing the reflux rate to enhance the separation effect. The same applies to full reflux at the tower top for impurity removal, if control over the quality of the side-stream product is required.
Too many issues: bottom of tower temperature, number of trays. Backflow volume, etc
A packed tower is being used; could insufficient packing height also be a factor?
There’s definitely no issue with the process design; check whether the bottom temperature is too high or if the reflux flow rate is too low.