Talk:Azeotrope

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I moved here the Advenced Theory section because it needs rephrasing. (e.g. "We can have", excessive capitalization) A reference would also be useful.--Unconcerned 23:25, 17 Aug 2004 (UTC)

ADVANCED THEORY:

There is another interesting phenomena that has been observed. 
Some azeotropic systems exhibit what is called "Multiplicity"
i.e. Multiple steady states.
For example the ternary system Methanol - Toluene - MethylButyrate
exhibit this Multiplicity.
For the same conditions of input such as Molar feed rate, 
composition, Reflux rate, Distillate flow rate and Column
temperature profiles; we can observe different product compositions,
Temperature profile and internal flow rates.
We can have for example 3 steady states: 2 Stable steady states and
1 unstable steady state.

Contents 1 min/max still not clear 2 Changes to azeotrope definition 3 Examples of Azeotropes 4 Graph -- Is it 2-propanol or 1-propanol??

[edit] min/max still not clear

The negative/positive and minimum-boiling/maximum boiling ideas don't scan, here. Someone who actually groks them needs to say what's varying. I suspect it's the boiling-point temperature varying vs. % concentration of the solute in water. At a certain concentration the boiling point of the mixture reaches a minimum; at any other concentration it will be higher; the concentration with the lowest boiling point is called the "minimum-boiling" or "negative boiling" concentration. I'm 99% sure this is what's meant, but I don't recognize the terminology and I'm too wikilazy to go look it up. Maybe later when the caffeine kicks in... Blair P. Houghton 22:27, 6 Jan 2005 (UTC)

[edit] Changes to azeotrope definition

I changed the definition, so that it was more accurate and also will clear up the last quesiton.

I tried to make a numbered list that would look good, but I don't know much about how to format this.

[edit] Examples of Azeotropes

Are the percentages mentioned by mass, mole or liquid volume ? It should be specified, ethanol-water, 95.5wt% ethanol, (wt=weight)

[edit] Graph -- Is it 2-propanol or 1-propanol??

Every source I looked at indicates that the azeotrope for 1-propanol is at 72% alcohol by weight and that the azeotrope for 2-propanol is at 88% alcohol by weight. The graph given in the article is labeled 2-propanol, but shows the azeotrope to be at approximately 70%. Something is not right here. Karl Hahn (T) (C) 16:09, 8 April 2007 (UTC)