Recent advances in facilitated transport membranes for olefin/paraffin separation
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Recent advances in facilitated transport membranes for olefin/paraffin separation Long Cheng1 · Gongping Liu1 · Wanqin Jin1 Received: 9 July 2020 / Accepted: 22 October 2020 © The Author(s) 2020 OPEN
Abstract With the development of the petrochemical industry, the demand for light olefins is rapidly increasing. The separation of olefin/paraffin by membrane technology can save energy consumption and improve separation efficiency. This article reviews the latest progress in facilitated transport membranes for olefin/paraffin separation. The separation mechanism and common types of facilitated transport membranes are briefly introduced. Meanwhile, the mechanism of carrier deactivation and the corresponding strategies to improve the stability of the membranes are summarized. In concluding, current developments regarding facilitated transport membranes are summarized and directions for future development are proposed. Keywords Facilitated transport · Olefin/paraffin separation · Polymer electrolyte membrane · Silver inactivation Abbreviations BMImBF4 1-Butyl-3-methylimidazole tetrafluoroborate ILs Ionic liquids MOFs Metal organic frameworks MMMs Mixed-matrix membranes PAAm Polyacrylamide PDMS Polydimethylsiloxane PEBAX Polyetherblockamide PEO Poly(ethylene oxide) POZ Poly(2-ethyl-2-oxazoline) PVDF-HFP Polyvinylidene fluoride-hexafluoropropylene copolymer PVP Polyvinylpyrrolidone p-BQ p-Benzoquinone SBS Poly(styrene-b-butadiene-b-styrene) SPPO Sulfonated polyphenoxy TCNQ 7,7,8,8-Tetracyanoquinodimethane XPS X-ray photoelectron spectroscopy 8G1 n-Octyl β-d-glucopyranoside
* Gongping Liu, [email protected] | 1State Key Laboratory of Materials‑Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, 30 Puzhu Road, Nanjing 211816, People’s Republic of China. Discover Chemical Engineering
(2021) 1:1
| https://doi.org/10.1007/s43938-020-00001-4
13 Vol.:(0123456789)
Review
Discover Chemical Engineering
(2021) 1:1
| https://doi.org/10.1007/s43938-020-00001-4
1 Background Light olefins such as ethylene and propylene are important raw materials for the petrochemical industry. The most widely used process for olefin production is the steam cracking of naphtha or light alkanes, followed by catalytic dehydrogenation, which leads to the production of olefin/paraffin mixtures [1]. Therefore, olefins must be separated from the mixtures before further utilization, and the most common method for olefin/paraffin separation is cryogenic distillation, which is extremely energy-intensive. Membrane separation technology has been proposed to replace the cryogenic distillation or be integrated with it to reduce the energy consumption [2–4]. At present, several membranes for olefin/paraffin separation have been reported [5–9]. Generally, membranes based on the solution-diffusion mechanism are not ideal for olefin/paraffin separation, because the physicochemical properties of olefins and paraffins are too close [10]. In addition, the difference in their molecular dynamic diameter
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