Ethane Pyrolysis in the Presence of Steam

Cryder, D. S.; Porter, D. J.

doi:10.1021/ie50330a015

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…The industrial process involves thermal dissociation of ethane at >800 °C and at/near atmospheric pressure. The mechanism and kinetics of this reaction have been widely studied since the 1930s. − However, the effects of elevated pressure on the pyrolysis have not been studied in detail. A recent study examined ethane pyrolysis and oxidation at 340 and 613 bar and the temperature range of 777−1177 °C; however, the experiments were conducted in a pulse shock tube …”

Section: Introductionmentioning

confidence: 99%

Generation of Ethylene Tracer by Noncatalytic Pyrolysis of Natural Gas at Elevated Pressure

Chen

Rostam-Abadi

et al. 2004

Energy Fuels

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There is a critical need within the pipeline gas industry for an inexpensive and reliable technology to generate an identification tag or tracer that can be added to pipeline gas to identify gas that may escape and improve the deliverability and management of gas in underground storage fields. Ethylene is an ideal tracer, because it does not exist naturally in the pipeline gas, and because its physical properties are similar to the pipeline gas components. A pyrolysis process, known as the Tragen process, has been developed to continuously convert the ∼2%−4% ethane component present in pipeline gas into ethylene at common pipeline pressures of 800 psi. In our studies of the Tragen process, pyrolysis without steam addition achieved a maximum ethylene yield of 28%−35% at a temperature range of 700−775 °C, corresponding to an ethylene concentration of 4600−5800 ppm in the product gas. Coke deposition was determined to occur at a significant rate in the pyrolysis reactor without steam addition. The δ 13C isotopic analysis of gas components showed a δ 13C value of ethylene similar to ethane in the pipeline gas, indicating that most of the ethylene was generated from decomposition of the ethane in the raw gas. However, δ 13C isotopic analysis of the deposited coke showed that coke was primarily produced from methane, rather than from ethane or other heavier hydrocarbons. No coke deposition was observed with the addition of steam at concentrations of >20% (by volume). The dilution with steam also improved the ethylene yield.

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Section: Introductionmentioning

confidence: 99%

Generation of Ethylene Tracer by Noncatalytic Pyrolysis of Natural Gas at Elevated Pressure

Chen

Rostam-Abadi

et al. 2004

Energy Fuels

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Verdampfungsgleichgewichte und kritische Kurven in den Systemen Äthan/Wasser und n‐Butan/Wasser bei hohen Drücken

Danneil¹,

Tödheide²,

Franck³

1967

Chemie Ingenieur Technik

110

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Die mit einem statischen Verfahren gemessenen Gleichgewichtszusammensetzungen der gasförmigen und flüssigen Phasen im System Äthan/Wasser werden zwischen 200 und 400°C bis zu Drücken von 3700 bar und für das System n‐Butan/Wasser bei 355 und 364°C bis zu Drücken von 1100 bar angegeben. In beiden Systemen ist die kritische Kurve unterbrochen. Ihr oberer Zweig verläuft vom kritischen Punkt des Wassers ausgehend zu niedrigeren Temperaturen, erreicht ein Temperaturminimum (350°C bei Äthan/Wasser und 351°C bei n‐Butan/Wasser) und wendet sich dann wieder zu höheren Temperaturen. Die kritischen Drücke steigen vom kritischen Druck des Wassers ausgehend monoton an.

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Chemical equilibria in the steam-reforming of n-butane

Rogers¹,

Crooks²

1966

J. Biochem. Toxicol.

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Ethane Pyrolysis in the Presence of Steam

Abstract: Various ethane-steam mixtures were led through a silica tube at different temperatures. At each temperature level, data were secured for the decomposition of the gaseous mixture

Cited by 5 publications

References 9 publications

Generation of Ethylene Tracer by Noncatalytic Pyrolysis of Natural Gas at Elevated Pressure

Generation of Ethylene Tracer by Noncatalytic Pyrolysis of Natural Gas at Elevated Pressure

Verdampfungsgleichgewichte und kritische Kurven in den Systemen Äthan/Wasser und n‐Butan/Wasser bei hohen Drücken

Chemical equilibria in the steam-reforming of n-butane

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