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Table 3

The critical properties, acentric factor, and the parameters required in equations (5) and (7).

The critical properties and the acentric factor of methane [54].
Pc/MPa Tc/K ω
4.599 190.564 0.0115
Values of the Langmuir constant of methane used in equation (5) [45].
X × 105/MPa−1 Y/K Z/K
2.3048 2752.29 23.01
Values of the Antoine constants of methane used in equation (7) [45].
A′ × 10−22/MPa B′/K C′/K
5.2602 −12 955 4.08

Pc: the critical pressure; Tc: the critical temperature; ω: the acentric factor.

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