How to calculate the negative pressure distillation process for the crude distillation of low-concentration ethanol
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For a negative-pressure distillation column used for the crude distillation of low-concentration ethanol, how are the column parameters related to feed at the top of the column (stripping column) calculated? For example, the column diameter, height, and number of trays. What’s the difference from a distillation tower? How should the temperatures at the top and bottom of the tower be set? Is it feasible to set the temperature at the top at 96 degrees and at the bottom at 105 degrees? What value is appropriate for the pressure at the top of the tower?
This post was last edited by zzy515 on 2010-7-14 21:38. The data you mentioned refers to a atmospheric pressure column; negative pressure is generally used in cascade distillation columns. The bottom temperature usually does not exceed 85 degrees, and 24 trays are sufficient
First, take a look at the chapter on distillation in \"Principles of Chemical Engineering.\" For process design, it is essential to know the feed concentration and flow rate, as well as the concentration requirements at the top and bottom of the tower. This type of stripping tower does not seem to be the most ideal equipment; it is better to use a conventional distillation tower, with the feed inlet located in the middle. If the feed concentration is very low, it should be placed quite close to the bottom of the tower.
Could the original poster provide more details? At present, I want to use Aspen to simulate the recovery of 5% low-concentration ethanol; a conventional two-column series configuration will suffice. Given the feed concentration and flow rate, as well as the desired concentration at the top of the columns, is it possible to obtain simulation results?
Reply to 4# Bingjing355: The results obtained through simulation can only be used as a reference for design, right?