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Influence of the Reactor Material Composition on Coke Formation during Ethane Steam Cracking

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    Influence of the Reactor Material Composition on Coke Formation during Ethane Steam Cracking
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    Laboratory for Chemical Technology, Ghent University, Technologiepark 914, B-9052 Gent, Belgium
    *E-mail: [email protected]
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    Industrial & Engineering Chemistry Research

    Cite this: Ind. Eng. Chem. Res. 2014, 53, 15, 6358–6371
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    https://doi.org/10.1021/ie500391b
    Published March 20, 2014
    Copyright © 2014 American Chemical Society
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    Abstract

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    An experimental study of the coking tendency of nine different materials was carried out in a quartz electrobalance setup with a jet stirred reactor (JSR) under industrially relevant ethane steam cracking conditions: Tmaterial = 1159 K, Ptot = 0.1 MPa, χethane = 73%, dilution δ = 0.33 kgH2O/kgHC. A strong influence of the composition of the materials on the coking rate as a function of time on-stream was observed. The initial coking rate varied from 5 × 10–4 g·m–2·s–1 to 27 × 10–4 g·m–2·s–1, while the asymptotic coking rate changed in the range of 2 × 10–4 g·m–2·s–1 to 6 × 10–4 g·m–2·s–1. SEM and EDX analyses of coked and uncoked coupons revealed that the composition of the oxide layer in contact with the cracked gas, formed after the initial preoxidation or decoking, has an important influence on the amount of coke deposited. Materials that formed a thin Al2O3 layer on the coupon surface showed a higher coking resistance. A uniform surface composition and a high resistance to spalling and fractures are other important characteristics of good materials.

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    This article is cited by 56 publications.

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    Cite this: Ind. Eng. Chem. Res. 2014, 53, 15, 6358–6371
    Click to copy citationCitation copied!
    https://doi.org/10.1021/ie500391b
    Published March 20, 2014
    Copyright © 2014 American Chemical Society
    Request reuse permissions

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