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Extra info for Handbook of Chemical Engineering Calculations, Edition: 3rd ed
Calculation Procedure 1. Estimate degree of liquefaction, if any. Since the expansion will result in cooling, the possibility of liquefaction must be considered. If it does occur, the ﬁnal temperature will be the saturation temperature Tsat corresponding to 150 psig. 81 from Fig. 1. 3) or 412◦ R. Use the following equation to estimate the mole fraction of ethylene liqueﬁed: S = 0 = (S1◦ − S1 ) + Tsat (C ◦p /T )dT − R ln (P2 /P1 ) − (S2◦ − S2 ) SG − x Svap T1 where (S1◦ − S1 ) and (S2◦ − S2 ) SG are the entropy departure functions for gas at inlet conditions and saturation conditions, respectively; Svap is the entropy of vaporization at the saturation temperature; x equals moles of ethylene liqueﬁed per mole of ethylene entering the turbine; and P1 and P2 are the inlet and exhaust pressures.