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Properties of Gases and Liquids 3rd edition (RPP3)

Contents

Source

Methods for calculating pure component properties from:

The Properties of Gases & Liquids, 3rd Edition Reid, Prausnitz and Polling, 1977, McGraw-Hill

Ideal Gas Molar Heat Capacity (Constant Pressure)

Properties of Gases and Liquids uses the following correlation for the ideal gas molar heat capacity:


cp ig = A + B × T + C × T2 + D × T3

Units are calories per gram-mole kelvin and Kelvin.

Parameters

Symbol Parameter Name Units Description
A cp_mol_ig_comp_coeff_A cal/mol · K
B cp_mol_ig_comp_coeff_B cal/mol · K2
C cp_mol_ig_comp_coeff_C cal/mol · K3
D cp_mol_ig_comp_coeff_D cal/mol · K4

Ideal Gas Molar Enthalpy

The correlation for the ideal gas molar enthalpy is derived from the correlation for the molar heat capacity and is given below:

$$h_{\text{ig}} - h_{\text{ig ref}} = A \times (T-T_{ref}) + \frac{B}{2} \times (T^2 - T_{ref}^2) + \frac{C}{3} \times (T^3 - T_{ref}^3) + \frac{D}{4} \times (T^4 - T_{ref}^4) + \Delta h_{\text{form, Vap}}$$

Units are calories per gram-mole kelvin and Kelvin.

Parameters

Symbol Parameter Name Units Description
A cp_mol_ig_comp_coeff_A cal/mol · K
B cp_mol_ig_comp_coeff_B cal/mol · K2
C cp_mol_ig_comp_coeff_C cal/mol · K3
D cp_mol_ig_comp_coeff_D cal/mol · K4
Δhform, Vap enth_mol_form_vap_comp_ref Base units Molar heat of formation at reference state

Note

This correlation uses the same parameters as the ideal gas heat capacity correlation. Units of molar heat of formation will be derived from the base units defined for the property package.

Ideal Gas Molar Entropy

The correlation for the ideal gas molar entropy is derived from the correlation for the molar heat capacity and is given below:

$$s_{\text{ig}} = A \times ln(T/T_{ref}) + B \times (T - T_{ref}) + \frac{C}{2} \times (T^2 - T_{ref}^2) + \frac{D}{3} \times (T^3 - T_{ref}^3) + s_{\text{form, Vap}}$$

Units are calories per gram-mole kelvin and Kelvin.

Parameters

Symbol Parameter Name Units Description
A cp_mol_ig_comp_coeff_A cal/mol · K
B cp_mol_ig_comp_coeff_B cal/mol · K2
C cp_mol_ig_comp_coeff_C cal/mol · K3
D cp_mol_ig_comp_coeff_D cal/mol · K4
sform, Vap entr_mol_form_vap_comp_ref Base units Standard molar entropy of formation at reference state

Note

This correlation uses the same parameters as the ideal gas heat capacity correlation . Units of molar entropy of formation will be derived from the base units defined for the property package.

Saturation (Vapor) Pressure

Properties of Gases and Liquids 3rd edition uses the following correlation to calculate the vapor pressure of a component:

$$Ln{(P_{sat}) = A - \frac{B}{T+C}}$$

Units are mmHg and Kelvin.

Parameters

Symbol Parameter Name Units Description
A pressure_sat_comp_coeff_A None
B pressure_sat_comp_coeff_B K
C pressure_sat_comp_coeff_C K