R. Benesch et T. Jacksier, A comparison of liquid hydrocarbon calibration standards in piston cylinders and standard cylinders with eductor tubes, ANALYT CHEM, 73(2), 2001, pp. 379-383
Natural gas liquid standards consist of various components primarily in the
C1-C6 range; they are available in three types of cylinder packages: pisto
n cylinders and two other types of standard cylinders with eductor tubes. T
he three cylinder packages have different operation conditions and thus a s
ample may behave differently in each of the packages. The piston cylinder m
aintains the components in a single liquid phase at a constant pressure, wh
ile the standard cylinders maintain the components as a two-phase mixture.
Typically, the components may distribute between the two phases in differen
t concentrations depending on the various thermodynamic variables, such as
temperature, pressure, and volume. This study will examine the integrity of
the sample in the three cylinder packages during a controlled cylinder dep
letion. The results for the various cylinders will be compared with a theor
etical model of the experiments.