Biocatalytic gas-liquid membrane contactors for CO2 hydration with immobilized carbonic anhydrase

2016 ◽  
Vol 520 ◽  
pp. 303-313 ◽  
Author(s):  
Jingwei Hou ◽  
Muhammad Yazid Zulkifli ◽  
Munirah Mohammad ◽  
Yatao Zhang ◽  
Amir Razmjou ◽  
...  
Keyword(s):  
Carbonic Anhydrase ◽  
Liquid Membrane ◽  
Membrane Contactors

scholarly journals Interphase Surface Stability in Liquid-Liquid Membrane Contactors Based on Track-Etched Membranes

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 949
Author(s):  
Stepan Bazhenov ◽  
Olga Kristavchuk ◽  
Margarita Kostyanaya ◽  
Anton Belogorlov ◽  
Ruslan Ashimov ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Porous Structure ◽  
Pore Size ◽  
Aqueous Phase ◽  
Liquid Membrane ◽  
Target Component ◽  
Interphase Surface ◽  
Asymmetric Membrane ◽  
Interface Stability ◽  
Membrane Contactors

A promising solution for the implementation of extraction processes is liquid–liquid membrane contactors. The transfer of the target component from one immiscible liquid to another is carried out inside membrane pores. For the first time, highly asymmetric track-etched membranes made of polyethylene terephthalate (PET) of the same thickness but with different pore diameters (12.5–19 nm on one side and hundreds of nanometers on the other side) were studied in the liquid–liquid membrane contactor. For analysis of the liquid–liquid interface stability, two systems widely diverging in the interfacial tension value were used: water–pentanol and water–hexadecane. The interface stability was investigated depending on the following process parameters: the porous structure, the location of the asymmetric membrane in the contactor, the velocities of liquids, and the pressure drop between them. It was shown that the stability of the interface increases with decreasing pore size. Furthermore, it is preferable to supply the aqueous phase from the side of the asymmetric membrane with the larger pore size. The asymmetry of the porous structure of the membrane makes it possible to increase the range of pressure drop values between the phases by at least two times (from 5 to 10 kPa), which does not lead to mutual dispersion of the liquids. The liquid–liquid contactor based on the asymmetric track-etched membranes allows for the extraction of impurities from the organic phase into the aqueous phase by using a 1% solution of acetone in hexadecane as an example.

Super selective membranes in gas–liquid membrane contactors for olefin/paraffin separation

2004 ◽  
Vol 232 (1-2) ◽  
pp. 107-114 ◽  
Author(s):  
Kitty Nymeijer ◽  
Tymen Visser ◽  
Rijanne Assen ◽  
Matthias Wessling
Keyword(s):  
Liquid Membrane ◽  
Membrane Contactors ◽  
Selective Membranes

scholarly journals Surface Modified Polysulfone Hollow Fiber Membranes for Ethane/Ethylene Separation Using Gas-Liquid Membrane Contactors with Ionic Liquid-Based Absorbent

Fibers ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 4 ◽  
Author(s):  
Margarita Kostyanaya ◽  
Stepan Bazhenov ◽  
Ilya Borisov ◽  
Tatiana Plisko ◽  
Vladimir Vasilevsky
Keyword(s):  
Hollow Fiber ◽  
Liquid Membrane ◽  
Membrane Contactor ◽  
Layer By Layer ◽  
Hollow Fiber Membranes ◽  
Acrylic Copolymer ◽  
Promising Alternative ◽  
Silver Salts ◽  
Fiber Membranes ◽  
Membrane Contactors

Olefin/paraffin separation is an important technological process. A promising alternative to conventional energy-consuming methods is employment of gas-liquid membrane contactors. In the present work, the membranes used were polysulfone (PSf) asymmetrical porous hollow fibers fabricated via the NIPS (non-solvent induced phase separation) technique in the free spinning mode. The surface of the fine-pored selective layer from the lumen side of the fibers was modified by layer-by-layer deposition of perfluorinated acrylic copolymer Protect Guard® in order to hydrophobized the surface and to avoid penetration of the liquid absorbent in the porous structure of the membranes. The absorbents studied were silver salts (AgNO3 and AgBF4) solutions in five ionic liquids (ILs) based on imidazolium and phosphonium cations. The membranes were analyzed through gas permeance measurement, SEM and dispersive X-ray (EDXS). Contact angle values of both unmodified and modified membranes were determined for water, ethylene glycol, ILs and silver salts solutions in ILs. It was shown that the preferable properties for employment in membrane contactor refer to the PSf hollow fiber membranes modified by two layers of Protect Guard®, and to the absorbent based on 1 M AgNO3 solution in 1-ethyl-3-methylimidazolium dicyanamide. Using the membrane contactor designed, ethylene/ethane mixture (80/20) separation was carried out. The fluxes of both components as well as their overall mass transport coefficients (MTC) were calculated. It was shown that the membrane absorption system developed provides absorption of approx. 37% of the initial ethylene volume in the mixture. The overall MTC value for ethylene was 4.7 GPU (gas permeance unit).

Integration of liquid-liquid membrane contactors and electrodialysis for ammonium recovery and concentration as a liquid fertilizer

Chemosphere ◽  
2020 ◽  
Vol 245 ◽  
pp. 125606 ◽  
Author(s):  
X. Vecino ◽  
M. Reig ◽  
O. Gibert ◽  
C. Valderrama ◽  
J.L. Cortina
Keyword(s):  
Liquid Membrane ◽  
Liquid Fertilizer ◽  
Membrane Contactors

Technical Evaluation of the Applicability of Gas-Liquid Membrane Contactors for CO2 Removal from CO2 Rich Natural Gas Streams in Offshore Rigs

2019 ◽  
Vol 965 ◽  
pp. 29-38
Author(s):  
Guilherme Pereira da Cunha ◽  
José Luiz de Medeiros ◽  
Ofélia de Queiroz Fernandes Araújo
Keyword(s):  
Natural Gas ◽  
Liquid Membrane ◽  
Feed Flow Rate ◽  
Unit Operation ◽  
Gas Streams ◽  
Feasible Option ◽  
Technical Evaluation ◽  
Gas Conditioning ◽  
Membrane Contactors ◽  
Process Simulator

This work aimed to fulfill a technical evaluation of the applicability of gas-liquid membrane contactors (GLMC) to remove CO2 from CO2 rich natural gas in offshore rigs. For this purpose, a simulation case in HYSYS 8.8 (AspenTech) was performed to remove CO2 from a natural gas stream with concentration of 40% mol CO2 using an aqueous solution of monoethanolamine (MEA) 30% w/w. GLMC unit operation is not available in HYSYS, though. Hence, it was necessary to develop a mathematical model based on log-mean of differences of CO2 fugacities in both phases. Moreover, a GLMC Unit Operation Extension (UOE) was created for GLMC units to run in the process simulator HYSYS 8.8 using its thermodynamic infrastructure. The developed GLMC unit operation extension performed accordingly to the expected behavior. For a gas feed flow rate of 5 MMNm3/d (typical from FPSO's), the calculated total GLMC mass transfer area was 1,986 m2, which requires 14 GLMC modules. Consequently, this operation showed to be a feasible option for CO2 removal in natural gas conditioning on offshore rigs. The heat ratio in the reboilers of CO2 stripping columns was found to be 167 kJ/mol, compatible with data found in the literature of CO2-MEA-H2O systems.

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