A Perspective of Solutions for Membrane Instabilities in Olefin/Paraffin Separations: A Review

Campos, Antoniel Carlos Carolino; Reis, Rodrigo A.; Ortiz, Alfredo; Gorri, Daniel; Ortíz, Inmaculada

doi:10.1021/acs.iecr.8b02013

Cited by 67 publications

(66 citation statements)

References 129 publications

(328 reference statements)

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“…Carbon molecular sieves constitute a class of amorphous carbon materials produced through the pyrolysis of microporous polymer precursors [8,59,62]. Although the surface area is relatively small, the characteristic pore sizes are small with narrow size distributions, enabling the separation at molecular level based on the size and shape of the molecules [8,63].…”

Section: Cmsmentioning

confidence: 99%

“…The pore diameters can be significantly different from characteristic sizes of molecules that must be separated. CMS materials can be fragile and it may be difficult to scale-up the production process [59,64].…”

Section: Cmsmentioning

confidence: 99%

“…Polymer films can present low gas permeabilities and selectivities [8] and are subject to swelling, plasticization, and heterogeneous structure and porosity [66]. Carriers can be subject to deactivation by poisonous agents [59].…”

Section: Polymermentioning

confidence: 99%

“…For this reason, development of effective membrane separations can be rather complex and normally requires a great deal of research and development in order to deliver acceptable commercial performances [58]. As a consequence, it is not surprising to observe that different types of membrane technologies have been proposed throughout the years and that the field continues to evolve [8,59].…”

Section: Introductionmentioning

confidence: 99%

“…As a matter of fact, even very small improvements in this area may exert an enormous financial impact on the economical performances of refineries. Additionally, the growing demand for olefins, such as ethylene and propylene, especially in emerging consumer markets, creates new opportunities for technologies that can lead to increase of olefin supply and reduction of production costs [8,59,61]. As a consequence, membrane separations can constitute excellent alternatives to expensive distillation processes [1,2,5].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Bibliometric Survey of Paraffin/Olefin Separation Using Membranes

et al. 2019

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Bibliometric studies allow to collect, organize and process information that can be used to guide the development of research and innovation and to provide basis for decision-making. Paraffin/olefin separations constitute an important industrial issue because cryogenic separation methods are frequently needed in industrial sites and are very expensive. As a consequence, the use of membrane separation processes has been extensively encouraged and has become an attractive alternative for commercial separation processes, as this may lead to reduction of production costs, equipment size, energy consumption and waste generation. For these reasons, a bibliometric survey of paraffin/olefin membrane separation processes is carried out in the present study in order to evaluate the maturity of the technology for this specific application. Although different studies have proposed the use of distinct alternatives for olefin/paraffin separations, the present work makes clear that consensus has yet to be reached among researchers and technicians regarding the specific membranes and operation conditions that will make these processes scalable for large-scale commercial applications.

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Section: Cmsmentioning

confidence: 99%

Section: Cmsmentioning

confidence: 99%

Section: Polymermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Bibliometric Survey of Paraffin/Olefin Separation Using Membranes

et al. 2019

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Self‐Assembled Facilitated Transport Membranes with Tunable Carrier Distribution for Ethylene/Ethane Separation

Dou

Wang

et al. 2021

Adv Funct Materials

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Facilitated transport membranes (FTMs) are a forward-looking technology and have triggered revolutions in many energy-intensive gas separations. However, the precise manipulation of carrier distribution within FTMs, as well as the visualization of membrane structure at the nanoscale, has never been reported. Herein, FTMs are constructed with tunable carrier distribution by a facile ion/molecule self-assembly of protic ionic liquid crystal salts (PILSs), polyol, and ethylene-transport carrier for highly efficient sub-angstrom scale ethylene/ ethane (0.416nm/0.443nm) separation. The elaborate regulation of non-covalent interactions by optimizing the ion/molecule compositions within membrane confers the bi-continuous nanostructure of FTMs, resulting in the formation of successive carrier wires and enormous 3D interconnected ethylene transport pathways, which is verified and visualized by molecular dynamics simulations and synchronous small-and wide-angle X-ray scattering (SWAXS). The as-designed FTMs manifest simultaneously super-high selectivity, excellent ethylene permeance, and robust long-term stability, which exceeds previously reported ethylene/ethane separation membranes. This study clearly draws the first picture of carrier distribution within FTMs, and deep insight into membrane structure will shed light on the design of high-performance separation membranes for energy-intensive gas separations.

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Metal Confined in 2D Membranes for Molecular Recognition and Sieving towards Ethylene/Ethane Separation

Cheng

Liu

et al. 2022

Advanced Materials

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lenge for 2D-material membranes to separate mixtures of molecules with extremely close physical properties and kinetic diameters owing to the lack of size-sieving properties and specific affinity of the 2D nanochannels. For instance, towards ethylene/ethane separation, the current distillation technology is very energy-consuming and concurrently increases carbon dioxide emissions. [8] It is considered as one of the seven chemical separations that if improved can reap great global benefits. [9] The most widely investigated membrane material for ethylene/ethane separation is a carbon molecular sieve (CMS), which possesses ultramicropores with molecular sieving properties. [10] However, the relatively low mechanical strength and aging problem might restrict its development. An alternative is developing ethylene or ethane-selective adsorbent, [11] which is based on designing specific interactions towards targeted molecules. Until now, there is no reported membrane material having both molecular sieving and specific interaction properties for efficient ethylene/ethane separation. Molecular recognition is some of the most significant features of chemical and biological systems. [12] The recognition effect stems from specific noncovalent interactions, including hydrogen bonding, metal coordination, van der Waals forces, and π-π interactions. The most common recognition motif is between antibodies and aptamers, [13] where the key lies in a unique structure formed by a folded and constrained bioheteropolymer that creates a binding pocket/interface able to recognize a specific molecule. Such exquisite molecular complementarity between antibodies and aptamers inspires us to mimic their structure and feature to construct 2D channels with optimized geometry and chemistry configurations for gaining improved molecular discrimination properties.Herein, we design novel metal-confining 2D sub-nanometer channels with molecular recognition and precise size-sieving for discriminating ethylene over ethane (Scheme 1). Graphene oxide (GO) nanosheets are assembled into 2D channels with precisely controlled sub-nanometer interlayer height to discriminate planar ethylene (4.84 Å × 4.18 Å × 3.28 Å) over stereoscopic ethane (4.82 Å × 4.08 Å × 3.81 Å) by the size difference of 0.53 Å along the c axis (Figure S1 and Table S1, Supporting Membranes with nanochannels have exhibited great potential in molecular separations, while it remains a great challenge to separate molecules with very close physical properties and kinetic diameters (e.g., ethylene/ethane) owing to the lack of size-sieving property and specific affinity. Herein, a metal confined 2D sub-nanometer channel is reported to successfully discriminate ethylene over ethane via molecular recognition and sieving. Transition metal cations are paired with polyelectrolyte anions to achieve high dissociation activity, forming reversible complexation with ethylene. Aberration-corrected transmission electron microscopy observes that the metals with size of ≈2 nm are uniformly confined in graph...

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A Perspective of Solutions for Membrane Instabilities in Olefin/Paraffin Separations: A Review

Cited by 67 publications

References 129 publications

A Bibliometric Survey of Paraffin/Olefin Separation Using Membranes

A Bibliometric Survey of Paraffin/Olefin Separation Using Membranes

Self‐Assembled Facilitated Transport Membranes with Tunable Carrier Distribution for Ethylene/Ethane Separation

Metal Confined in 2D Membranes for Molecular Recognition and Sieving towards Ethylene/Ethane Separation

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