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# Antoine's Constants?

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### #1 Helena_Ali

Helena_Ali

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Posted 04 April 2008 - 04:04 PM

Where can I get Antoine's constants for ammonia and Co2?

### #2 Art Montemayor

Art Montemayor

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Posted 04 April 2008 - 05:41 PM

Well, you can start right here at this Webiste. First, use the SEARCH function and this will take you to previous threads that discuss this subject. For example try:
http://www.cheresources.com/invision/index.php?showtopic=5435&pid=17577&st=0&#entry17577

Next, go to this Webiste's home page and click on the Free Software Section. You will find there a great collection of Free software - including an Excel Workbook that gives all 468 compounds and elements together with all of their important properties, including the coefficients for the Antoine equation as well as the Harlacher equation.

It looks like you came to the right place.

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Posted 05 April 2008 - 08:00 AM

Helena, u could find Antoin's Constant on Lange's Chemistry Handbook
In Chapter 'Vapour Pressure' you can find Antoin's Constant for many substance, also with the formula.

resmi

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Posted 06 April 2008 - 06:56 AM

Dear,
While making the calculation check your P and T ranges. There are 2 sets of the Antoine equations. The original Antoine equation has a 3 parameters or coefficients i.e. A, B and C. This provides good fit for all liquids given freedom to choose values for thse 3 parametrs to get the best fit.The equation fit sometimes become inadequate over wide range of the pressures (e.g. from 0.01 bar to 1000 bar) and in this case the fit can be imroved by the Extended Antoine Equation which has 5 parameters i.e. A,B,C,D and E.
Another simplest form is 2 parameter equation where the value of C is taken as - 43 (minus 43) throughout.