I am a student from Chicago, and I need to calculate the pressure necessary for an adiabatic liquefaction of nitrogen. Desired starting temperature is 275 K or 175 K. I have been searching the internet for some time now, with very limited results (I was able to find formulas for an ideal gas, which are not of much help). What is the Joule-Thomson coefficient for nitrogen? Will J-T coefficient change as pressure/density changes? Will nitrogen liquefy through an adiabatic process at these temperatures? If you can answer any of these questions I would be grateful.
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Peter Kittel
August 1, 2008Thermodynamic data is available at http://webbook.nist.gov/chemistry/fluid/
or one may purchase PC software at http://webbook.nist.gov/chemistry/fluid/
or http://www.htess.com/cryodata.htm.