Preparation and morphological characterization of polyurethane/polyethersulfone composite membranes

Duarte, Luciana Tavares; Habert, Alberto Cláudio; Borges, Cristiano Piacsek

doi:10.1016/s0011-9164(02)00366-1

Cited by 17 publications

(10 citation statements)

References 6 publications

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“…The best way for the salt to be in the membrane is in the form of free ion, because the silver is more available to the interaction with the olefin. 90,[94][95][96] 45,51,62,84,92,93 poliurethanes (PU) based on polyether or polyester 21,[97][98][99] and poly(ether-block-amide) (best known under the trademark Pebax ® ) 28,100,101 are used as suitable polymer matrix to maintain the dissolution of the silver salts in solid electrolyte membranes. The lower lattice energy of the salt is also crucial in this point to provide an easier way to dissolve the 14 compound.…”

Section: Electrolyte Membranesmentioning

confidence: 99%

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

Campos

Reis

Ortiz

et al. 2018

Ind. Eng. Chem. Res.

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Light olefins are mainly produced by naphtha steam cracking, which is among the more energy intensive processes in the petrochemical industry. To save energy, some alternatives have been proposed to partially replace or combine with cryogenic distillation the conventional technology to separate olefins and paraffins. Within this aim, facilitated transport membranes, mainly with Ag + cations as selective carriers, have received great attention owing to the high selectivity and permeance provided. However, to be used industrially, the undesirable instability associated with the Ag + cation should be considered. Poisonous agents and polymer membrane materials are sources of Ag + deactivation. In recent years, great achievements on the separation performance have been reported, but the current challenge is to maintain the selectivity in long-term separation processes. This work presents a critical analysis of the potential causes of Ag + deactivation and points out some alternatives that have been proposed to overcome the hurdle. This review highlights and critically analyses some perspectives of the ongoing development and application of facilitated transport membranes.

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Section: Electrolyte Membranesmentioning

confidence: 99%

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

Campos

Reis

Ortiz

et al. 2018

Ind. Eng. Chem. Res.

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“…The selected water/NMP composition in the bore fluid was suggested by previous studies with a triple extrusion of PU/PES hollow fibers, resulting in controlled and adequate morphologies. [16,34] The PVP was added to increase the liquid viscosity. Demineralized water and anhydrous ethanol (EtOH 99.5%, Vetec) were used as the first precipitation media in the outer annular channel of the quadruple spinneret.…”

Section: Quadruple Spinningmentioning

confidence: 99%

Dual-layer hollow fibers for gas separation processes produced by quadruple spinning

Amaral

Mermier

Habert

et al. 2015

Separation Science and Technology

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A novel quadruple spinneret to produce dual-layer hollow fiber membranes by simultaneous spinning of two polymer solutions, using the dual precipitation bath technique is proposed. Hollow fibers aimed at gas separation processes were prepared in extrusion system specifically designed and built for this purpose. A polyurethane polymer was selected as the selective layer (outer-layer), while polyethersulfone was defined as the support (inner-layer). Activated carbon powder was added into the PU solution for further improvement of the transport properties. The hollow fibers showed good adhesion between the polymer layers and a defect-free selective layer. Representative results include a CO 2 /N 2 selectivity of 43.

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“…The most accepted mechanism to explain permeant transport across a fixed carrier membrane is based on the transfer of permeant from chain to chain by hopping from site to site due to the Liquid membrane Microporous support extensive thermal motions of the polymer matrix, as shown in Figure 3 (Duarte et al, 2002). In Figure 3(a), the permeant A molecule is bound to a site on the polymer backbone.…”

Section: Fixed Carrier Membranesmentioning

confidence: 99%

Recent achievements in facilitated transport membranes for separation processes

Ferraz

Duarte

Luccio

et al. 2007

Braz. J. Chem. Eng.

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-Membrane separation processes have been extensively used for some important industrial separations, substituting traditional methods. However, some applications require the development of new membranes. In this work, we discuss recent progress achieved in this field, focusing on gas and liquid separation using facilitated transport membranes. The advantages of using a carrier species either in a liquid membrane or fixed in a polymer matrix to enhance both the flux and the selectivity of the transport are summarized. The most probable transport mechanisms in these membranes are presented and the improvements needed to spread this technology are also discussed. As examples, we discuss our very successful experiences in air fractioning, olefin/paraffin separation and sugar recovery using liquid and fixed carrier membranes.

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Preparation and morphological characterization of polyurethane/polyethersulfone composite membranes

Cited by 17 publications

References 6 publications

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

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

Dual-layer hollow fibers for gas separation processes produced by quadruple spinning

Recent achievements in facilitated transport membranes for separation processes

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