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. ● [Ans.: x = 0.136]

Fig: 1