Distillation column feed issue
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I would like to ask everyone: if the distillation column uses a vapor-liquid mixed feed (with q between 0 and 1), should xf still be calculated using the mole fraction of one of the components divided by the total moles, following that formula? . . Why? Thank you. This post was last edited by kent0801 on 2009-2-9 11:08.]
In other words, is the total molar amount the sum of the gas phase and the liquid phase? . . Can the molar numbers of the gas and liquid phases be added?
In my opinion, regardless of the feed condition, the total molar fraction xf of a certain component in the feed mixture is still given by the number of moles of that component divided by the total number of moles; of course, the number of moles of that component is the sum of its moles in the gas phase and its moles in the liquid phase.
The molar numbers in the gas and liquid phases cannot be added together, right? Because molar number = mass/molecular weight, and according to the law of conservation of mass, masses can be added together. Therefore, as long as the molecular weights are different, the molar numbers cannot be added together.
I’ve figured it out; it should be possible to calculate it this way. . . Since moles equal the number of molecules divided by 6.02 multiplied by 10 to the 23rd power, when the mass and the number of molecules are the same, the mole amount is also the same; it’s only the volume after the molecules disperse that changes. . . Thank you all for your active participation. . . Please ask the moderators of your forum to give points as encouragement to those who posted above; thank you