Talk:Vapor-liquid equilibrium

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[edit] Chembioeng Logo

Hi Henry I am currently working on a project to design a logo for petrochemical distillation company in South Africa They, strangely enough used the distillation diagram you have on this page as their logo. I have been researching into what other examples I can use as symbolisation. Symbols that carry the correct representation of the evaporation / condensation process, which are simplified. I have been searching for the symbol for condensation & the symbol for evaporation, but I cannot find any sort of symbol. (So I am assuming it doesn't exist?) Being in your industry, what other symbols may be related to the distillation industry or symbols related to the change of liquid - gas states generally in science. Or can you suggest where I can get the symbol for condensation & evaporation? Kindest regards Vanessa

Hi Vanessa,

Those circles in light blue with the jagged arrows through them are general heat exchanger symbols used by chemical engineers in chemical process flow diagrams. This logo is highly simplified miniversion of another diagram I made last year. I will try to get back to you soon on this query soon, when I have a few moments to spare. H Padleckas 19:43, 9 July 2007 (UTC)

[edit] Vapor Pressure as a function of Temperature

Henry, do you think it is really necessary to include more than a sentence or two stating that vapor pressures are a function of temperature and therefore partial pressures are also a function of temperature? All those equations using function of (T) as in P₁(T) and P⁰₂(T) are very confusing and, at least to me, they are not needed. Just stating that vapor pressures are functions of temperature and, thus, so are partial pressures ought to be enough. Regards, mbeychok 04:32, 15 November 2006 (UTC)

Based on your recommendation, I took those equations out. Sorry it took a while, but I had "situations" in my personal life that demanded my attention and I was rather busy until now. H Padleckas 22:52, 18 March 2007 (UTC)

Hello Henry, Milton told me you were writing on VLE, and then Dirk directed me here. Very thorough work indeed. As I have done a tiny bit of experimental work, some years ago, not too well documented, I know from the pages of Ind Eng Chem the pains to which experimenters would go in the determination of VLE, ensuring purity of components by several successive laboratory distillations discarding a good bit of the first and last fractions, correcting for changes of barometric pressures between tests etc. The design of the apparatus was different in the cases I read about, the two names that easily come to mind are those of Othmer and Gillespie. At the time of my interest in these a miniscule sample was taken from the gas and the liquid phases and analysed eg by refractive index measurements. The apparatus and the analytical technique must have developed pretty much during the years and I expect that new methods might be used now for vapour composition measurement without removal of any liquid?As you must know the apparatus used runs with total reflux, and the equilibrium concentrations would be similar to idealised continuous distillation concentrations, where corrections could be applied for change of conditions on successive trays. This has raised my interest in a sketch of such an equipment. I presume, that you would intend to present such drawing(s), and I would be interested seeing such.

I've read through, reasonably thoroughly, what you have written so far, and to me all seems to be understandable, there are only a couple of typographical errors (omissions?) in the penultimate paragraph, but I have not altered anything; you might wish to read through those lines. Otherwise all is well done. Kind regards, LouisBB 21:00, 6 December 2006 (UTC)

In the penultimate para starting with:... At a given P_tot ...... in the next line you wrote... function of x₁ (or x₁) and this ...... Did you not mean the bracketed item to be (or x₂) ? Have a nice Christmas and New Year, Cheers LouisBB 20:51, 23 December 2006 (UTC)

Yes, it took me a while unfortunately but I made that correction. I finally put in the diagrams I wanted to put in. I am now pretty much ready to move this "temp" article to Vapor liquid equilibrium. H Padleckas 22:52, 18 March 2007 (UTC)

I've moved the "temp" page to the permanent article Vapor-Liquid Equilibrium with variations of the title redirecting to it. If somebody thinks the proper title should be Vapor-liquid equilibrium, you can move the page to it. H Padleckas 02:05, 19 March 2007 (UTC)

[edit] Ternary diagram details

Someday I plan to take some of the ternary diagram details out of here and instead put in a link to a very similar version of this article in Engineering Wiki which will have this more detailed discussion, which I have yet to copy to Engineering Wiki. I think these details are too involved and complex for the general Wikipedia reader and the link will be there for those few who are truly interested. H Padleckas 01:41, 22 March 2007 (UTC)