It is very important to predict the condensation of liquid hydrocarbons when transporting natural gas with pipelines in industry. By using of a high-pressure transparent sapphire cell, the hydrocarbon dew points of eight synthetic natural gas mixtures were measured with the isothermal pressure search method. The test temperature ranges from 234.5 K to 295.35 K and pressure ranges from 1.706 MPa to 11.495 MPa, the results were used to evaluate the performance of the SRK and PR EOSs in predicting dew points. The measured results showed that the cricondentherm and cricondenbar decrease with the increasing of CH4 concentration, however, they present an increasing trend with the increasing of other hydrocarbon components (C2H6 and C3+) concentration. It was found that 0.98 mol% changes in the n-C5 concentration leads to the cricondentherm decreased 22 K, and 0.46 mol% changes in the n-C6 concentration results in the cricondentherm reduced 27 K. Correspondingly, the cricondenbar decreased 1.9 MPa and 2.7 MPa, respectively. In industry, the heavy hydrocarbon can be absorbed with low volatile oil before proceeding with pipeline, which can contribute to prevent the condensation of liquid hydrocarbons. For the dew points prediction by equation of state, the PR calculation exhibited a good agreement with the
Compounds
#
Formula
Name
1
CH4
methane
2
C2H6
ethane
3
C5H12
pentane
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.