The procedure for calculation of the residual enthalpy for a pure gas is shown in Example 8.5.
Question:
The procedure for calculation of the residual enthalpy for a pure gas is shown in Example 8.5. Now consider the residual enthalpy for a binary gas mixture. For this calculation, it is necessary to determine da/dT for the mixture.
(a) Write the form of this derivative for a binary mixture in terms of da1/dT and da2/dT based on the conventional quadratic mixing rule and geometric mean combining rule with a nonzero kij.
(b) Provide the expression for the residual enthalpy for a binary mixture that follows the Peng-Robinson equation.
(c) A mixture of 50 mol% CO2 and 50 mol% N2 enters a valve at 7 MPa and 40°C. It exits the valve at 0.1013 MPa. Explain how you would determine whether CO2 precipitates, and if so, whether it would be a liquid or solid.
Example 8.5 Enthalpy departure for the Peng-Robinson equation Obtain a general expression for the enthalpy departure function of the Peng-Robinson equation.
Step by Step Answer:
Introductory Chemical Engineering Thermodynamics
ISBN: 9780136068549
2nd Edition
Authors: J. Elliott, Carl Lira
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