2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 6. New and Advanced Materials and Technologies

Editors:F. Kongoli, F. Marquis, P. Chen, T. Prikhna, N. Chikhradze
Publisher:Flogen Star OUTREACH
Publication Year:2018
Pages:392 pages
ISBN:978-1-987820-92-8
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Effect of Temperature and Cyclohexylamine as Inhibitor for Deactivation of Modified Catalyst in the Downstream of the Ethylene Dimerization Process

    Reza Azizmohamadi1; Seyed Hamed Mahdaviani2; Davood Soudbar3;
    1PROCESS ENGINEER, RFCC UNIT, SHAZAND OIL REFINERY COMPANY, Arak, Iran; 2SENIOR CATALYST RESEARCHER, R&D CENTER, ARAK PETROCHEMICAL COMPANY (ARPC), Arak, Iran; 3HEAD OF CATALYSIS AND POLYMER RESEARCH GROUP, R&D CENTER, ARAK PETROCHEMICAL COMPANY (ARPC), Arak, Iran;
    Type of Paper: Regular
    Id Paper: 346
    Topic: 43

    Abstract:

    In the ethylene dimerization process, the reactor effluent contains a homogenous Ti-based catalyst system that is contacted with an amine-type inhibitor to deactivate the catalyst. For the improved catalysts with high activity and selectivity, the kind of amine and its amount have great importance to completely deactivate it in the previously mentioned stream and hence prevent the polymerization reaction and fouling formation in the downstream heat exchangers of the process. In the present study through simulation of the effluent conditions of the industrial 1-butene reactor in a 1-L laboratory reactor of BA¼chi type, the effects of temperature and molar ratio of cyclohexylamine (CHA) as the catalyst deactivator to modified catalyst on weight of polymer (WPE (mg)) and weight percentage of oligomer (OL (wt. %)) were investigated. The results showed that the increase of temperature from 86 A°C to 98 A°C resulted in the remarkable increase of WPE and slight increase of OL (wt. %). For the [CHA/modified catalyst] molar ratio, the optimum value to achieve both minimum WPE and OL (wt. %) was 1. Increasing this molar ratio to 1.5 led to a noticeable increase of WPE. A further increase of the [CHA/modified catalyst] molar ratio resulted in the decrease of WPE. However, with increase of this molar ratio from 1 to 3, OL (wt. %) was continuously increased. In addition, we performed the studies using 1H-NMR spectrum for better understanding of the steric coordinative interaction of CHA over the titanium center of the catalytic system.

    Keywords:

    Catalyst removal; Ethylene dimerization; Inhibitor; Temperature; Polymer

    References:

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    Cite this article as:

    Azizmohamadi R, Mahdaviani S, Soudbar D. (2018). Effect of Temperature and Cyclohexylamine as Inhibitor for Deactivation of Modified Catalyst in the Downstream of the Ethylene Dimerization Process. In F. Kongoli, F. Marquis, P. Chen, T. Prikhna, N. Chikhradze (Eds.), Sustainable Industrial Processing Summit SIPS2018 Volume 6. New and Advanced Materials and Technologies (pp. 385-388). Montreal, Canada: FLOGEN Star Outreach