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Cubic EoS - only VAPOR root is converging o_o

  1. Mar 16, 2014 #1
    Hello. I would like to inquire as to how to deal with the said topic title.

    I'm trying to generate a VLE graph for ethylene oxide-water. While I know that EO will quickly vaporize since the boiling point of EO is quite low, I'm still trying to generate a VLE using SRK.

    So while the vapor root is converging, the liquid root won't.

    Upon inspection (and using taylor expansion of the third degree to simplify the equation), I noticed that the two roots (the liquid root and the useless middle root) converge in the complex domain. Does this have a physical meaning?
  2. jcsd
  3. May 4, 2014 #2
    I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?
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