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K-Values in Highly Aromatic and Highly Naphthenic Real Oil Absorber Systems, March 1971


NGPA Project 691, Phase Equilibria in Refrigerated Absorber Oil Systems, was initiated under Dr. G.M. Wilson, P-V-T, Inc. Houston. This project grew out of a demonstrated need for data on real natural gas fluids. Data for binary systems were presented to NGPA in 1967 by Rice University which showed a significant change in methane vapor-liquid equilibrium values in the presence of a heavy paraffin, or aromatic, or napthenic component. At the same time, field reports indicated that refrigerated absorber oil plants were operating at conditions substantially different from design. As a result, the Vapor-Liquid Equilibrium Steering Committee started a program to determine whether the composition of the absorber significantly changed the light component K-values in real absorber systems using refrigerated oils. The first phase of this research, covering tests on 103MW and 130 MW real oils with "typical" PNA analysis, was reported to NGPA by Dr. Grant Wilson of P-V-T, Inc. in "K-Values in Absorber Oil -Natural Gas Systems, Experimental Study", September, 1968 and summarized at the Forty-Eighth Annual NGPA Convention. These data were of such significance that the Steering Committee, with the approval of the Technical Committee, extended the research program through 1969 and 1970 to measure K-values for real systems with a highly napthenic oil and with a highly aromatic oil.

Dr. Grant M. Wilson and Sherman T. Barton, P-V-T, Inc., Houston, Texas

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