Steam Cracking of Hydrocarbons. 1. Pyrolysis of Heptane

Abstract

Bajus, M.; Vesely, V.; Leclercq, P.A.; Rijks, J.A. Published in:Industrial and Engineering Chemistry. Product Research and Development DOI:10.1021%2Fi360069a007 10.1021/i360069a007Published: 01/01/1979 Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Link to publication• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. 1, 1979 Gandhi, H. S., Sheief, M., J , Catal., 24, 241 (1972).Gregg, S. J., Sing, K. S. W., "Adsorption, Surface Area and Porosity", Academic Hirota, K., Kera, Y., Teratani, S., J . Phys. Chem., 59, 388 (1955 (1 973).(USSR) 15, 408 (1974). (1972). GENERAL ARTICLESShvets, V. A., Kazanskii, V. B., J . Catal., 25, 123 (1972). Shvets, V. A.. Sarichev, M. E., Kazanskii, V. B., J. Catal., 11, 378 (1968) , 1424 (1955). 3rd, 1964 (1965). Catalysis", Academic Press, New York, N.Y., 1967. 597 (1971. 1966.Received for review February 13, 1978 Accepted The thermal decomposition of heptane in the presence of steam was studied in a flow reactor with large inner surface. The experiments were performed at atmospheric pressure in a temperature range of 680-760 OC for a mass ratio of steam to hydrocarbon 3 : l . The reaction products were analyzed by gas chromatography. For the identification both comparison of retention indices with those of standard compounds and literature data and mass spectrometry were used. The conversion process appeared to be a first-order reaction with a frequency factor of 1.34 X 10'' s-' and an activation energy of 195.5 kJ mol-'. The composition of the mixture of reaction products was in agreement with the Rice-Kossiakoff theory, except for ethane and 1-hexene.

High pressure pyrolysis of n-heptane

“…Numerous studies have been published on the pyrolysis of n-paraffins such as ethane, propane, n-butane, n-heptane, n-decane, n-hexadecane etc. at atmospheric pressure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The main thrust in these studies has been to enhance the yield of low molecular weight olefins.…”

“…Appleby et al [8], Murata and Saito [9,11], Bajus et al [12], Aribike and Susu [6] and Pant and Kunzru [13] have investigated the kinetics and product distribution of atmospheric pressure pyrolysis of n-heptane. Aribike and Susu [7] developed a detailed mechanistic model of n-heptane pyrolysis, whereas Pant and Kunzru [13] developed a model based on a molecular reaction scheme.…”

Steam Cracking of Hydrocarbons. 2. Pyrolysis of Methylcyclohexane

“…Figures 11 and 12 show the ratio of methane and ethane to ethene for both reactors at 780 "C in identical conditions. This property of the reaction system is not specific for methylcyclohexane, but is valid for other hydrocarbons too, e.g., heptane (Bajus et al, 1979), straight-run naphtha, and naphthas from catalytic reforming after the extraction of aromatic hydrocarbons (Bajus et al, 1977). The decrease in yields of methane and ethane is due probably to the scavenging of methyl and ethyl radicals, which together with hydrogen radicals belong to the most active and have an important place in the propagation of the radical chain.…”

Modeling the influence of mineral rocks, active in different hot gas conditioning systems and technologies, on the production of light α‐olefins

“…This indicates that the rate constant was independent of the conversion. Bajus et al (1979) and Aribike and Susu (1988a) have reported that fmt-order rate constants for nheptane pyrolysis are independent of conversions at other temperatures (residence time <0.06 s and V/F 4 . 0 s, respectively), thus confirming the assumption that the thermal cracking of nheptane can be represented by first-order kinetics.…”

“…In a tubular flow reactor there is no sharp difference between the preheater and the reactor section (Bajus et al, 1979;Taralas et al, 1991) was calculated by converting non-isothermal data to pseudoisothermal conditions by the equivalent reactor concept (Taralas et al, 1991 VR, is defined as the volume necessary to reach the same conversion of the hydrocarbon at a constant reference temperature TRI as under the non-ideal isotherm conditions of the experiments with the temperature T, thus:…”