ON THE RETROGRADE CONDENSATION BEHAVIOR OF LEAN NATURAL-GAS

The occurrence of liquid dropout in natural gas pipelines may cause op erational problems during storage, transport, and processing. Therefor e, the availability of a model that accurately predicts the amount of liquid formed is of great importance for the natural gas industry. The objective of this study is to develop a thermodynamic model for the a ccurate prediction of the amount of liquid formed in natural gas pipel ines at transportation conditions. As input, the model requires an acc urate gas analysis. A modified Peng-Robinson equation of state was sel ected for the phase equilibrium calculations. Interaction parameters w ere optimized from experimental data at conditions of practical intere st, i.e., at pressures 10 < p < 70 bar and at temperatures 250 < T < 2 90 K. For a number of ''keysystems,'' the interaction parameters were calculated from new accurate solubility data of heavy hydrocarbons in some of the main constituents of natural gas like methane and nitrogen . Also, an extensive experimental program was carried out to study the influence of minute amounts of nitrogen, ethane and carbon dioxide in methane on the solubility behavior of decane in these gas mixtures. F rom a sensitivity analysis, it could be concluded that the liquid drop out is influenced mainly by the concentration and characterization of C-7-C-13 fractions. In this work, two characterization procedures to r epresent these fractions are compared. For two types of lean natural g as, the model predictions are compared with field measurement data, re cently supplied by the Dutch natural gas industry.