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Title: Ngl Sampling
Author: Eric Estrada
Source: 2014 Natural Gas Sampling Technology Conference
Year Published: 2016
Abstract: NGLs are hydrocarbons liquefied by gas processing plants containing ethane, propane, butane, and natural gasoline. Because of the varying size of molecules in an NGL stream, NGLs are susceptible to solution mixing effects. Solution mixing occurs when compounds containing different sized molecules are mixed together resulting in the smaller molecules fitting into the voids created by the structure of the larger molecules. A simple example of this effect can be described using sand and gravel. Assume a person is building a 4 thick patio base consisting of 2 of sand and 2 of gravel. In calculating the volume of each constituent required to produce a 4 high base, one would assume that they would simply be require equal amounts of sand and gravel. When the base is built up, there is astonishment when the resulting base is much less that 4 high with a large majority of the sand settled within the gravel. Similarly, when hydrocarbons of varying sizes are mixed together, volumetrically there will always be some solution mixing effect resulting from smaller molecules mixing in between larger molecules. Figure 1 shows molecular models of Normal Butane, Propane, and Ethane respectively and the variability in the size of the molecules.

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