High-pressure experimental vapour-liquid-liquid equilibrium measurements and modelling for natural gas processing: Equipment validation, and the system CH4+nC6H14+H2O

Abstract

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Phase Behavior in Natural Gas + Glycol Systems, Part 1: Tri(ethylene glycol) (TEG) and Its Aqueous Solutions

“…As previously mentioned, the CPA approach has been successfully applied by several authors for systems involving glycols. ,,,,,, The version of sCPA presented here has been developed over the past decade at the Hydrates, Flow Assurance & Phase Equilibria Research Group at Heriot-Watt University. Predictions for water/TEG were presented by Chapoy et al, while predictions for CH 4 /H 2 O are discussed in Chapoy et al Parameters for TEG are reproduced in Table , and an adjusted expression for parameter c 1 in eq is given by eq .…”

“…Despite the new advances, cubic equations of state (CEoS) are still a benchmarked standard, widely used in the oil and gas industry. Systems involving glycols, water, and hydrocarbons have been modeled with modified versions of the traditional SRK or PR CEoS by several authors. ,,− A general form of these models can be written as for which δ 1 = 1 and δ 2 = 0 for SRK or δ 1 = 1 + √2 and δ 2 = 1 – √2 for PR. In addition, the appropriate expression for a *­( T ) is composition dependent and is related to the chosen approach as shown in Table .…”