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Processes 2016, 4(4), 42; doi:10.3390/pr4040042

An Integrated Membrane Process for Butenes Production

Institute on Membrane Technology (ITM-CNR), National Research Council c/o, The University of Calabria, Cubo 17C, Via Pietro BUCCI, 87036 Rende CS, Italy
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Academic Editor: Fausto Gallucci
Received: 11 August 2016 / Revised: 8 November 2016 / Accepted: 8 November 2016 / Published: 15 November 2016
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Abstract

Iso-butene is an important material for the production of chemicals and polymers. It can take part in various chemical reactions, such as hydrogenation, oxidation and other additions owing to the presence of a reactive double bond. It is usually obtained as a by-product of a petroleum refinery, by Fluidized Catalytic Cracking (FCC) of naphtha or gas-oil. However, an interesting alternative to iso-butene production is n-butane dehydroisomerization, which allows the direct conversion of n-butane via dehydrogenation and successive isomerization. In this work, a simulation analysis of an integrated membrane system is proposed for the production and recovery of butenes. The dehydroisomerization of n-butane to iso-butene takes place in a membrane reactor where the hydrogen is removed from the reaction side with a Pd/Ag alloys membrane. Afterwards, the retentate and permeate post-processing is performed in membrane separation units for butenes concentration and recovery. Four different process schemes are developed. The performance of each membrane unit is analyzed by appropriately developed performance maps, to identify the operating conditions windows and the membrane permeation properties required to maximize the recovery of the iso-butene produced. An analysis of integrated systems showed a yield of butenes higher than the other reaction products with high butenes recovery in the gas separation section, with values of molar concentration between 75% and 80%. View Full-Text
Keywords: integrated process; membranes; iso-butene production integrated process; membranes; iso-butene production
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Melone, L.; Brunetti, A.; Drioli, E.; Barbieri, G. An Integrated Membrane Process for Butenes Production. Processes 2016, 4, 42.

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