Experimental Variables in Recycle Gas Chromatography

Pauls, R. E.; Shepard, A. T.; Phelps, Janelle E.; Davis, James E.; Rogers, L. B.

doi:10.1080/00372367708058078

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…The key to its successful operation for a large number of cycles has been shown independently by a Russian group (3) and by our laboratory (4) to depend on having the pressure at the exit above atmospheric. In addition, our earlier experiments indicated that it might be advantageous to use column packings of larger particles than had previously been reported.…”

Section: R-5mentioning

confidence: 81%

Fundamental studies of separation processes. Technical progress report

Rogers¹

1979

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Section: R-5mentioning

confidence: 81%

Fundamental studies of separation processes. Technical progress report

Rogers¹

1979

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“…Three of the four topics proposed in this section last year have been started-and two of them have been completed. First, recycling chromatography has been shown in our laboratory (9) and, independently, in a Russian laboratory (1 0) to be a much more powerful technique when operated at an elevated pressure. Plate numbers, corresponding to those obtainable in capillary columns, and sample sizes, characteristic of packed columns, can be combined for difficult separations of two-component or three-component mixtures, such as those of optical i!Dmers or isotopic species.…”

Section: Chromatographic Fractionation Of Sulfur Isotopesmentioning

confidence: 93%

Fundamental studies of separation processes

Rogers¹

1977

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Studies completed during the past year were: pressure and temperature effects on retention behavior of ion pairs, fractionation studies of sulfur isotopes in. carbon disulfide, anomolous peak shapes obtained in gas chromatography using liquid crystal stationary phases in an electrostatic field, and the application of a new steric-exclusion packing for molecular-weight fractionation of petroleum crudes. Studies are continuing on the effects of the dead volume of a detector on the peak shape as a functior:' of flow rate and molecular weight of the solute and on basic studies relating to the optimization of chromatographic parameters in supercritical fluid chromatography of large molecules, especially polymers. New studies that have been initiated include: the fractionation and identification of vanadium species in crude oils, the study of recycling chromatography c:at elevated pressures for difficult separations such as those involving isotopes, and the application of gradient techniques in liquid chromatography for the fractionation of polymers. Finally, equipment has been ordered for making solubility studies relating to the precipitation of compounds from geothermal brines, but experiments have not yet begun.

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