2. A stream of propane gas is partially liquefied by throttling from 200 bar and

370 K to 1 bar. What fraction of the gas is liquefied in this process?

Notes:

• The vapor pressure of propane is given by Wagner equation [Equation

(6.77)] with the following parameters:

A = -6.72219; B = 1.33236; C = -2.13868; D = -1.38551

For Non-ideal gas behavior, use (1) the generalized method for PVT

properties and (2) Lee-Kessler Tables for residual properties.

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[Ans.: x = 0.136]