Natural gas having a molar analysis of 75% methane (CH4) and 25% ethane (C2H6) enters a compressor at 340 K, 6 bar and is compressed isothermally without internal irreversibilities to 20 bar. The compressor operates at steady state, and kinetic and potential energy effects are negligible. (a) Assuming ideal gas behavior, determine for the compressor the work and heat transfer, each in kJ per kmol of mixture flowing.
(b) Assuming ideal solution behavior, determine for the compressor the work and heat transfer, each in kJ per kmol of mixture flowing.
For the pure components at 340 K:
(kVkg) h (k/kg) 6 bar 715.33 462.39 20 bar 704.40 439.13 6 bar 10.9763 7.3493 20 bar 10.3275 6.9680 Methane Ethane