ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
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Kinetics and modelling of heptane steam-cracking

Natália Olahová, Martin Bajus, Elena Hájeková, Lukáš Šugár, and Jozef Markoš

Department of Petroleum Technology and Petrochemistry, Slovak University of Technology in Bratislava, Radlinského 9, 812 37, Bratislava, Slovakia



Abstract: The kinetics and product distribution during the cracking of heptane in the presence of steam were investigated. The experiments were performed in a flow reactor under atmospheric pressure in a temperature range of 680–760°C with a mass ratio of steam to heptane of 3: 1. The overall decomposition of heptane is represented by a first-order reaction with activation energy of 249.1 kJ mol−1 and a frequency factor of 3.13 × 1013 s−1. The reaction products were analysed using gas chromatography, the main product being ethylene. The molecular reaction scheme, which consists of a primary reaction and 24 secondary reactions between primary products, was used for modelling the experimental product yields. The yields of ethylene and hydrogen were in good agreement; however the experimental yields of propylene were higher than the predicted yields.

Keywords: steam-cracking – heptane – kinetics – product distribution – molecular model

Full paper is available at

DOI: 10.2478/s11696-013-0518-2


Chemical Papers 68 (12) 1678–1689 (2014)

Tuesday, June 18, 2024

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