A new look at light hydrocarbon separations on commercial alumina PLOT columns: Column selectivity and separation

Ji, Zhenghua; Chang, Imogene

doi:10.1002/jhrc.1240190106

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…For this column, the elution order of the hydrocarbons can vary depending on the temperature program. In the literature, there are many examples of the separation of light hydrocarbon mixtures, including those with cyclopropane, on capillary columns with alumina deactivated with KCl [59,[62][63][64][65][66][67][68][69][70]. In all these cases, the order of elution of C 3 hydrocarbons was established: propane, cyclopropane, propylene, allene and methylacetylene.…”

Section: Choosing Of Temperature Programmes For Gc Analysismentioning

confidence: 99%

The Formation of Small Amounts of Cyclopropane during Pulsed Pyrolysis of C4–C5 Acyclic Alkanes in the Adiabatic Compression Reactor

Билера

2023

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During high-temperature pulse pyrolysis of acyclic butanes and pentanes under adiabatic compression conditions, cyclopropane, a stressed cyclic hydrocarbon, was found among the reaction products in small quantities for the first time. The analysis of the reaction products was performed by gas chromatography using three capillary columns of different polarity, selectivity and sufficient efficiency. The identification of reaction products, including cyclopropane, was performed using retention times of individual substances and model mixtures, as well as comparing chromatograms with reference chromatograms from the literature and the ScanView Application Database. It was shown that the chromatographic peak attributed to cyclopropane could not be a ghost peak. Additional confirmation of this conclusion was obtained in a series of experiments on the pyrolysis of n-butane at a reduced initial temperature of the adiabatic compression reactor (from 120 °C to 50 °C) and a modified mode of GC analysis. Cyclopropane yields as a function of maximum temperature have a bell-shaped asymmetric dependence. The maximum value of the yield of cyclopropane increases with the transition from normal alkanes to isoalkanes, and from pentanes to butanes; for n-pentane, 0.009 wt. %, and for isobutene, ≈0.017 wt. %. During the pulse pyrolysis of isobutane, n-butane, isopentane and n-pentane, cyclopropane is not a primary product. Further theoretical and experimental studies are needed to establish the mechanism of cyclopropane formation during pyrolysis of C4–C5 acyclic alkanes.

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Section: Choosing Of Temperature Programmes For Gc Analysismentioning

confidence: 99%

The Formation of Small Amounts of Cyclopropane during Pulsed Pyrolysis of C4–C5 Acyclic Alkanes in the Adiabatic Compression Reactor

Билера

2023

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“…Alumina was also a popular material in early separations [9,94,95] as well as more recent work [96][97][98][99].…”

Section: Normal-phase Modelsmentioning

confidence: 99%

Liquid chromatographic retention studies using polystyrene-divinylbenzene stationary phases in reversed-phase and normal-phase eluents

Chambers

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The Column in Gas Chromatography

Poole

2003

The Essence of Chromatography

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A new look at light hydrocarbon separations on commercial alumina PLOT columns: Column selectivity and separation

Cited by 8 publications

References 6 publications

The Formation of Small Amounts of Cyclopropane during Pulsed Pyrolysis of C4–C5 Acyclic Alkanes in the Adiabatic Compression Reactor

The Formation of Small Amounts of Cyclopropane during Pulsed Pyrolysis of C4–C5 Acyclic Alkanes in the Adiabatic Compression Reactor

Liquid chromatographic retention studies using polystyrene-divinylbenzene stationary phases in reversed-phase and normal-phase eluents

The Column in Gas Chromatography

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