Evaporative Fractionation

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Setup

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We will use the modified data as defined in the fingerprinting section to examine fractionation.

The evaporative fractionation experiment involves taking the mixture in its one-phase region, adding enough methane to saturate it (force it to a two-phase region), flashing it moving both phases to a shallower depth, reflashing, and examining all phases.

1:  determine phase/depth relationship for original mixture

So, we are one-phase deeper than 2.1 km

2: Force the mixture two-phase by adding methane

We choose a depth of 2.5 km

So, the mixture is clearly 1-phase at 2.5 km.

Add a bunch of methane to the mixture

Take several of the above, and decompress them...

So, if we add 80% (by mole) of methane, the mixture goes two-phase.  

Evaporative Fractionation

Next, Look at the Tompson Ratios in the liquid phase

get the appropriate liquid data

get the liquid/vapor compositions

get the liquid phase

The following shows the ratio of C6/C10 aromatic versus C6/C10 paraffinitic for mixtures that have undergone evaporative fractionation.  Each line compares the ratio of two compounds in the liquid phase derived from the original mixture with additional amounts of added methane.  Different points along the line represent different depths, from 1.5 km to 2.3 km.

get the appropriate vapor data

get the liquid/vapor compositions

get the vapor phase

The following shows the ratio of C6/C10 aromatic versus C6/C10 paraffinitic for mixtures that have undergone evaporative fractionation.  Each line compares the ratio of two compounds in the liquid phase derived from the original mixture with additional amounts of added methane.  Different points along the line represent different depths, from 1.5 km to 2.3 km.