retrograde condensation

retrograde condensation

[′re·trə‚grād ‚kän·dən′sā·shən]
(organic chemistry)
Phenomenon associated with the behavior of a hydrocarbon mixture in the critical region wherein, at constant temperature, the vapor phase in contact with the liquid may be condensed by a decrease in pressure; or at constant pressure, the vapor is condensed by an increase in temperature.
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References in periodicals archive ?
Natural gas transmission pipelines are generally near-horizontal and operate with low-liquid loadings, where liquid presence is expected mainly as a result of retrograde condensation.
The book begins with an overview of the phase diagrams of fluid mixtures (fluid = liquid, gas, or supercritical state), which can show an astonishing variety when elevated pressures are taken into account; phenomena like retrograde condensation (single and double) and azeotropy (normal and double) are discussed.