Novel heterogeneous membranes for enhanced separation in organic-organic pervaporation

Knozowska, Katarzyna; Li, Guoqiang; Kujawski, Wojciech; Kujawa, Joanna

doi:10.1016/j.memsci.2020.117814

Cited by 30 publications

(18 citation statements)

References 70 publications

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“…The increase in CA is due to the formation of the elective PDMS layer on the outer surface of hollow fiber substrate. Our results are in agreement with the literature values of CA of PDMS membranes [ 51 , 52 , 53 , 54 ]. Knozowska et al [ 51 ] and Kujawska et al [ 52 ] found that the CA of flat sheet pristine PDMS membrane was 115°.…”

Section: Resultssupporting

confidence: 93%

“…Our results are in agreement with the literature values of CA of PDMS membranes [ 51 , 52 , 53 , 54 ]. Knozowska et al [ 51 ] and Kujawska et al [ 52 ] found that the CA of flat sheet pristine PDMS membrane was 115°. While Khorasani et al [ 53 ] and Lin et al [ 54 ] found that the CAs of native PDMS membranes were 105° and 108°, respectively.…”

Section: Resultssupporting

confidence: 93%

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The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

Kujawski

Knozowska

et al. 2021

Membranes

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The CO2 separation from flue gas based on membrane technology has drawn great attention in the last few decades. In this work, polyetherimide (PEI) hollow fibers were fabricated by using a dry-jet-wet spinning technique. Subsequently, the composite hollow fiber membranes were prepared by dip coating of polydimethylsiloxane (PDMS) selective layer on the outer surface of PEI hollow fibers. The hollow fibers spun from various spinning conditions were fully characterized. The influence of hollow fiber substrates on the CO2/N2 separation performance of PDMS/PEI composite membranes was estimated by gas permeance and ideal selectivity. The prepared composite membrane where the hollow fiber substrate was spun from 20 wt% of dope solution, 12 mL/min of bore fluid (water) flow rate exhibited the highest ideal selectivity equal to 21.3 with CO2 permeance of 59 GPU. It was found that the dope concentration, bore fluid flow rate and bore fluid composition affect the porous structure, surface morphology and dimension of hollow fibers. The bore fluid composition significantly influenced the gas permeance and ideal selectivity of the PDMS/PEI composite membrane. The prepared PDMS/PEI composite membranes possess comparable CO2/N2 separation performance to literature ones.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 93%

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

Kujawski

Knozowska

et al. 2021

Membranes

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“…It can be stated that hydrophilic membranes can be also applied for the removal of excess water from the feed. Obtained results are consistent with our recently published works [ 48 , 49 ].…”

Section: Resultssupporting

confidence: 93%

“…In our previous works [ 48 , 49 ], the enrichment factor for water ( EF water ) was applied for the assessment of water influence on the resultant efficiency of the pervaporation separation process (Equation (5)) [ 48 , 49 ]. Value of enrichment factor higher than 1 indicates that water is transported preferentially from feed to permeate.…”

Section: Resultsmentioning

confidence: 99%

A New Type of Composite Membrane PVA-NaY/PA-6 for Separation of Industrially Valuable Mixture Ethanol/Ethyl Tert-Butyl Ether by Pervaporation

et al. 2020

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Pervaporation is a membrane technique used to separate azeotropic and close boiling solvents. Heterogenous PVA composite membranes with NaY zeolite supported on polyamide-6 were fabricated and utilized in organic–organic pervaporation. The efficiency of prepared membranes was evaluated in the separation of ethanol/ethyl tert-butyl ether (EtOH/ETBE) using separation factor (β) and the thickness normalized pervaporation separation index (PSIN). Implementation of the fringe projection phase-shifting method allowed to the determined contact angle corrected by roughness. The influence of the presence of water traces in the feed on the overall separation efficiency was also discussed using the enrichment factor for water (EFwater). The incorporation of NaY into PVA matrix increases surface roughness and hydrophilicity of the composite membrane. It was found that membranes selectively transport ethanol from the binary EtOH/ETBE mixture. The values of β (2.3) and PSIN (288 μm g m−2 h−1) for PVA-NaY/PA6 membrane were improved by 143% and 160% in comparison to the values for the pristine PVA/PA6 membrane. It was found that membranes showed EFwater > 1, thus revealing the preferential transport of water molecules across membranes. These results are also significant for the design of membranes for the removal of water excess from the mixtures of organic solvents.

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“…However, for the other types of spacer molecules, i.e., C 10 H 20 O 2 NH 2 (ether linkage), the value of E f was found to be over 85%. The established data were higher than the results presented in the literature for the grafting of alumina with the commercially available ATPES modifier, which was found in the range of 65-84 % [31,32,44].…”

Section: Al 2 O 3 Powderscontrasting

confidence: 76%

Molecular Decoration of Ceramic Supports for Highly Effective Enzyme Immobilization—Material Approach

et al. 2021

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A highly effective method was developed to functionalize ceramic supports (Al2O3 powders and membranes) using newly synthesized spacer molecules. The functionalized materials were subsequently utilized for Candida antarctica lipase B enzyme immobilization. The objective is to systematically evaluate the impact of various spacer molecules grafted onto the alumina materials will affect both the immobilization of the enzymes and specific material surface properties, critical to enzymatic reactors performance. The enzyme loading was significantly improved for the supports modified with shorter spacer molecules, which possessed higher grafting effectiveness on the order of 90%. The specific enzyme activity was found to be much higher for samples functionalized with longer modifiers yielding excellent enantioselectivity >97%. However, the enantiomeric ratio of the immobilized lipase was slightly lower in the case of shorter spacer molecules.

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Novel heterogeneous membranes for enhanced separation in organic-organic pervaporation

Cited by 30 publications

References 70 publications

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

A New Type of Composite Membrane PVA-NaY/PA-6 for Separation of Industrially Valuable Mixture Ethanol/Ethyl Tert-Butyl Ether by Pervaporation

Molecular Decoration of Ceramic Supports for Highly Effective Enzyme Immobilization—Material Approach

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