I need some help! Regarding distillation
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At laboratory atmospheric pressure, substances with a boiling point difference of 20 degrees, 77 and 97, are separated. How many trays are approximately needed? ? Thank you, could someone please help tell me~! ! How tall would a column need to be if random glass filler were used? ? Thank you~~! !
To extract the 97-degree component, a purity of 99% is required; the feed ratio is on a mass basis, with the light component to heavy component ratio being 2 to 1.
It is illustrated using the plate-by-plate calculation method or by drawing equilibrium lines and distillation section operating lines. Calculate the number of theoretical plates. The height of the packing is calculated using the equivalent theoretical plate height.
Calculating it board by board is a bit troublesome. I remember there’s a small software that allows you to input the values directly; you can search for it on Baidu. Also, it’s important to determine whether your two components form a binary azeotrope – if so, it becomes quite complicated
The greater the restorative separation gap, the better the separation; if you are referring to methanol and ethanol, it is difficult to separate them in a laboratory, while in industry a tower with 55 trays is generally used for separation.
Is it azeotropic? It must have physical and chemical properties.
Acrylonitrile and propynonitrile have boiling points of 77 and 97 respectively. I’ve checked relevant textbooks on chemical engineering principles; it seems that around 27 plates are required for the separation process. However, no information on the appropriate glass packing materials was found in those books. It was only mentioned that approximately 15–20 plates can be obtained using 1 meter of glass packing material. I’m currently using columns with a length of half a meter, and it’s possible to obtain the desired pure product, but the amount obtained is very small and the yield is low. Could increasing the height of the column help improve the yield?
Assume that the mixture obeys Raoult’s law, with a relative volatility of less than 10. The average boiling temperature of the mixture is 87 degrees, at a gauge pressure of 10 KPA. The relative volatility is 2.5 and the minimum reflux ratio is 1. 5, the actual reflux ratio is 2. 5. The minimum number of theoretical plates is 15. The overall tower efficiency is estimated to be 0. 7. The actual total number of theoretical plates is 22. This post was last edited by Albertlu on 2009-3-30 21:26]
The boiling point alone is not sufficient to calculate the height of a distillation tower; the height of the distillation tower is related to the vapor-liquid equilibrium curve
Did you forget to mention what the diameter of the distillation tower is?