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Developing the technology for producing highly concentrated iso-butylene

  • Catalysis in Chemical and Petrochemical Industry
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Abstract

The technology used at Russian plants for the recovery of polymerization-grade iso-butylene is based on synthesizing tert-butanol through the hydration of iso-butylene incorporated into raw hydrocarbon fractions with the subsequent separation and decomposition of tert-butanol. The hydration of iso-butylene is performed in reactive extraction reactors with countercurrent initial reagents on a molded sulfocationite catalyst. In this paper, a version of the process performed in a flow reactor at near-stoichiometric ratios of reagents is proposed in the context of modernizing the existing technology. The dependence of iso-butylene conversion and the amount of by-products (dimers, sec-butanol) on the type of hydrocarbon feedstock and the process parameters is studied. The iso-butane-iso-butylene fraction (IIF) and the butylene-iso-butylene fraction (BIF) are used as feedstocks. It is shown that iso-butylene conversion is lower for the BIF feedstock, and the concentration of by-products is higher than for the IIF feedstock. A tert-butanol synthesis flowsheet is proposed that includes flow and reactive extraction reactors and allows us to increase the capacity of an existing plant with a simultaneous reduction in the process’s overall energy consumption due to the production of a highly concentrated tert-butanol solution at the outlet of the flow reactor, and to obtain iso-butylene with a purity of no less than 99.99 wt %.

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Article Open access 02 December 2021

Baoxin Zhang, Dilver Peña Fuentes & Armin Börner

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Authors and Affiliations

  1. OAO Nizhnekamskneftekhim, Nizhnekamsk, Tatarstan, 423574, Russia

    V. Z. Kuz’min, I. I. Safarova & V. A. Shepelin

  2. OOO EITEK Research and Production Company, Nizhnekamsk, Tatarstan, 423575, Russia

    I. A. Kayumov

  3. Nizhnekamsk Chemical Engineering Institute, Nizhnekamsk, Tatarstan, 423570, Russia

    D. Kh. Safin

Authors
  1. V. Z. Kuz’min
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  2. I. A. Kayumov
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  3. I. I. Safarova
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  4. D. Kh. Safin
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  5. V. A. Shepelin
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Corresponding author

Correspondence to V. Z. Kuz’min.

Additional information

Original Russian Text © V.Z. Kuz’min, I.A. Kayumov, I.I. Safarova, D.Kh. Safin, V.A. Shepelin, 2013, published in Kataliz v Promyshlennosti.

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Kuz’min, V.Z., Kayumov, I.A., Safarova, I.I. et al. Developing the technology for producing highly concentrated iso-butylene. Catal. Ind. 5, 204–208 (2013). https://doi.org/10.1134/S2070050413030070

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  • DOI: https://doi.org/10.1134/S2070050413030070

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