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

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3676
Author(s):  
Katarzyna Knozowska ◽  
Joanna Kujawa ◽  
Renars Lagzdins ◽  
Alberto Figoli ◽  
Wojciech Kujawski
Keyword(s):  
Composite Membrane ◽  
Separation Efficiency ◽  
Composite Membranes ◽  
Polyamide 6 ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Membrane Technique ◽  
New Type ◽  
Phase Shifting Method ◽  
Pervaporation Separation

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.

Composite Chitosan Membranes for the Separation of Methanol/methyl tert-butyl Ether Mixtures

2014 ◽  
Vol 67 (2) ◽  
Author(s):  
Mohd Ghazali Mohd Nawawi ◽  
Zafifah Zamrud
Keyword(s):  
Surface Morphology ◽  
Composite Membranes ◽  
Operating Conditions ◽  
Methanol Concentration ◽  
Methyl Tert Butyl Ether ◽  
Optimum Operating ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Separation Factors ◽  
Swelling Characteristics

Composite membranes from chitosan blended with different ratios of chitosan were developed for the pervaporation of methanol/methyl tert-butyl ether mixtures. The composite membranes were characterized for surface morphology and sorption. Surface morphology showed chitosan and PVA were homogenously blend for all chitosan composition. Swelling characteristics of composites membrane were affected by methanol concentration as well as chitosan composition in the blend. Increasing feed temperatures and methanol concentration in the feed in pervaporation increased the flux and decreased the separation factor. The composite membranes containing 20 to 40 wt% chitosan was chosen as the preferred membrane formulation to yield fluxes ranging from 50 to 70 g/m2hr with separation factors ranging from 55 to 80 at optimum operating conditions of 30 wt% methanol in the feed and feed temperature of 50 0C.

Polyion Complex Chitosan Membrane Consisting of Sodium Alginate/Chitosan for the Pervaporation Separation of Methanol/Methyl tert-butyl Ether Mixtures

2013 ◽  
Vol 66 (1) ◽  
Author(s):  
M. G. Mohd Nawawi ◽  
Zafifah Zamrud
Keyword(s):  
Sodium Alginate ◽  
Composite Membranes ◽  
Methyl Tert Butyl Ether ◽  
Separation Performance ◽  
Butyl Ether ◽  
Polyion Complex ◽  
Tert Butyl ◽  
Swelling Characteristics ◽  
Separation Performances ◽  
Feed Temperature

The polyion complex (PIC) composite membranes consisting of chitosan (CS) and sodium alginate (SA) were prepared for the separation of methanol/methyl tert-butyl ether (MTBE) mixtures via pervaporation process. Membrane morphologies showed that CS and SA were homogenously intermixed for all blended ratio tested. Swelling characteristics observed all membranes were readily swelled in the solution mixtures containing more methanols. Separation performance of the membranes via pervaporation was performed on the effect of SA composition in the membrane blend, effect of MTBE concentration in the feed and effect of feed temperature. Overall separation performances showed that the membranes were highly permselective towards methanol due to the affinity and polarity for all the studied parameters. 

NaY zeolite membrane for the pervaporation separation of methanol–methyl tert-butyl ether mixtures

1997 ◽  
pp. 45-46 ◽  
Author(s):  
Hidetoshi Kita ◽  
Tsutomu Inoue ◽  
Hidetoshi Asamura ◽  
Kazuhiro Tanaka ◽  
Kenichi Okamoto
Keyword(s):  
Zeolite Membrane ◽  
Methyl Tert Butyl Ether ◽  
Nay Zeolite ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Pervaporation Separation

scholarly journals High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1213
Author(s):  
Ilya Borisov ◽  
Ivan Podtynnikov ◽  
Evgenia Grushevenko ◽  
Olga Scharova ◽  
Tatiana Anokhina ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Separation Factor ◽  
Concentration Polarization ◽  
Composite Membranes ◽  
Methyl Tert Butyl Ether ◽  
Side Chain ◽  
Butyl Ether ◽  
Water Separation ◽  
Selective Layer ◽  
First Time

For the first time, the effect of the side-chain in polyalkylmethylsiloxane towards pervaporative removal of methyl tert-butyl ether (MTBE) from water was studied. The noticeable enhancement of separation factor during the pervaporation of 1 wt.% MTBE solution in water through the dense film (40–50 µm) can be achieved by substitution of a methyl group (separation factor 111) for heptyl (161), octyl (169) or decyl (180) one in polyalkylmethylsiloxane. Composite membrane with the selective layer (~8 µm) made of polydecylmethylsiloxane (M10) on top of microfiltration support (MFFK membrane) demonstrated MTBE/water separation factor of 310, which was 72% greater than for the dense film (180). A high separation factor together with an overall flux of 0.82 kg·m−2·h−1 allowed this M10/MFFK composite membrane to outperform the commercial composite membranes. The analysis of the concentration polarization modulus and the boundary layer thickness revealed that the feed flow velocity should be gradually increased from 5 cm·s−1 for an initial solution (1 wt.% of MTBE in water) to 13 cm·s−1 for a depleted solution (0.2 wt.% of MTBE in water) to overcome the concentration polarization phenomena in case of composite membrane M10/MFFK (Texp = 50 °C).

scholarly journals Blended Chitosan and Polyvinyl Alcohol Membrane for Pervaporation Separation Methanol/Methyl tert-Butyl Ether Mixture. (II) Effect of Operating Parameters

2013 ◽  
Vol 65 (1) ◽  
Author(s):  
M. G. Mohd Nawawi ◽  
Zafifah Zamrud ◽  
Z. Idham ◽  
O. Hassan ◽  
N. Mohd Sakri
Keyword(s):  
Polyvinyl Alcohol ◽  
Separation Factor ◽  
Composite Membranes ◽  
Methyl Tert Butyl Ether ◽  
Butyl Ether ◽  
Blend Membrane ◽  
Membrane Flux ◽  
Ether Mixture ◽  
Feed Temperature ◽  
Pervaporation Separation

Blend chitosan and polyvinyl alcohol (PVA) composite membranes were developed by mixing PVA and chitosan solutions at appropriate ratios. Pervaporation separation of the membrane was tested for methanol and MTBE mixture at different feed concentrations and temperature. The pervaporation performances were studied and evaluated and compared to the composite chitosan membrane. Flux increased with the increasing concentration of methanol in the feed. Separation factor was highest for the 20 wt% chitosan-containing blend membrane. The blend membrane containing 20-40 wt% of chitosan at feed temperature of 50⁰C exhibited permeation flux in between 52.28 g/m2.hr to 66.92 g/m2.hr with the separation factor of 53.22 to 81.00. 

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