Preparation of Silicalite Membranes on Stainless Steel Grid Supports

Lopez, F. W. B.; Bernal, María; Mallada, Reyes; Coronas, Joaquı́n; Santamarı́a, Jesús

doi:10.1021/ie048972t

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…12 Zeolite membranes can be produced by hydrothermal crystallization of specific zeolite films, typically of the FAU, MFI and DDR type, onto various types of porous supports, e.g. stainless steel, 13 a and g alumina, 14,15 clay, 16 cordierite, 17 glass 18 and carbon. 19 Some zeolite membranes have been introduced commercially, e.g.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically porous binder-free silicalite-1 discs: a novel support for all-zeolite membranes

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Hierarchically porous binder-free silicalite-1 discs: a novel support for all-zeolite membranes

et al. 2011

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“…Polydimethylsiloxane (PDMS) and silicalite, pure and multilayer composite membranes were synthesized on 316 L porous stainless steel disks (Mott Corp., diameter = 5.6 cm, thickness = 0.039 in, average pore size = 2 µm). Before coating, the supports were treated with water and acetone in an ultrasonic bath . PDMS membranes were prepared from RTV615A and RTV615B (Momentive Performance Materials) by spin‐coating at 1000 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…Membrane synthesized by both techniques, i.e. in situ direct synthesis and secondary growth, and the residual powder collected at the bottom of the autoclave after the synthesis were washed with distilled water until pH 7, and dried at 80 °C for 24 h. The template in the silicalite pores was removed by heating to 470 ° C for 4 h at a heating rate of 0.3 °C min −1 and a cooling rate of 5 °C min −1 . Multilayer composite membranes were prepared by coating silicalite membranes with PDMS solution by spin‐coating at 1000 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…Before coating, the supports were treated with water and acetone in an ultrasonic bath. 18,19 PDMS membranes were prepared from RTV615A and RTV615B (Momentive Performance Materials) by spin-coating at 1000 rpm. The silicone compound A and the crosslinking agent B were mixed in a 10:1 ratio using toluene as a solvent to obtain a PDMS concentration of 1000 mg mL −1 .…”

Section: Membrane Preparationmentioning

confidence: 99%

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Experimental assessment of the integration of in situ removal of ethanol by pervaporation with a simultaneous saccharification–fermentation process

Orozco-González

Bustamante

Cárdenas

2016

J of Chemical Tech & Biotech

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BACKGROUND The effect of process integration in bioethanol productivity was experimentally evaluated by coupling an ethanol‐selective pervaporation module to a simultaneous saccharification–fermentation process (SSF). Ethanol concentration in the permeate stream and ethanol productivity were evaluated. Polydimethylsiloxane (PDMS) and silicalite, pure and composite multilayer membranes, supported on porous stainless steel disks, were synthesized and used. Selectivity tests were conducted using ethanol–water mixtures and fermentation broths (5–12 wt% ethanol). RESULTS Multilayer composite membranes showed the best performance among the membranes studied; separation factor, permeance and ethanol concentration in the permeate stream were 31.4, 5.39 kg m−2 h−1 bar−1 (959 gas permeation units (gpu)) and 81.77 wt%, and 26.5, 5.02 kg m−2 h−1 bar−1 (894 gpu) and 77.41 wt%, with model solutions (12.76 wt% ethanol) and actual fermentation broths (11.69 wt% ethanol), respectively. The coupled pervaporator–SSF system, using silicalite‐PDMS multilayer composite membranes, achieved ethanol concentrations in the permeate up to 71.53 wt% and an increase of 3% in productivity with respect to the SSF process without in situ removal of ethanol; permeance and separation factor in the coupled system were 3.25 kg m−2 h−1 bar−1 (578.4 gpu) and 24.8, respectively. CONCLUSIONS The integrated process improves bioreactor productivity and could reduce the energy penalty in the distillation process conventionally used in bioethanol production. © 2016 Society of Chemical Industry

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“…Calculations have suggested that using FAU, CO 2 /N 2 separation with selectivity exceeding 500 and with CO 2 permeability of 10 000 barrer (1 barrer = 3.35 × 10 –16 mol m/(m 2 s Pa), permeance units are expressed in GPU, with barrer and GPU being the same for a 1 μm membrane) can be achieved . Extensive research is being carried out on zeolite membranes, − with development of novel ways to deposit zeolites on supports . Growth of zeolite crystals within the pores of alumina supports, a method referred to as pore plugging, and gas separation properties with such materials have also been reported. − Polymer supports are also being used for zeolite membranes .…”

Section: Introductionmentioning

confidence: 99%

Bendable Zeolite Membranes: Synthesis and Improved Gas Separation Performance

Wang¹,

Ho²,

Figueroa

et al. 2015

Langmuir

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Separation and sequestration of CO2 emitted from fossil energy fueled electric generating units and industrial facilities will help in reducing anthropogenic CO2, thereby mitigating its adverse climate change effects. Membrane-based gas separation has the potential to meet the technical challenges of CO2 separation if high selectivity and permeance with low costs for large-scale manufacture are realized. Inorganic zeolite membranes in principle can have selectivity and permeance considerably higher than polymers. This paper presents a strategy for zeolite growth within the pores of a polymer support, with crystallization time of an hour. With a thin coating of 200-300 nm polydimethylsiloxane (PDMS) on the zeolite-polymer composite, transport data for CO2/N2 separation indicate separation factors of 35-45, with CO2 permeance between 1600 and 2200 GPU (1 GPU = 3.35 × 10(-10) mol/(m(2) s Pa)) using dry synthetic mixtures of CO2 and N2 at 25 °C. The synthesis process results in membranes that are highly reproducible toward transport measurements and exhibit long-term stability (3 days). Most importantly, these membranes because of the zeolite growth within the polymer support, as contrasted to conventional zeolite growth on top of a support, are mechanically flexible.

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Preparation of Silicalite Membranes on Stainless Steel Grid Supports

Cited by 16 publications

References 28 publications

Hierarchically porous binder-free silicalite-1 discs: a novel support for all-zeolite membranes

Hierarchically porous binder-free silicalite-1 discs: a novel support for all-zeolite membranes

Experimental assessment of the integration of in situ removal of ethanol by pervaporation with a simultaneous saccharification–fermentation process

Bendable Zeolite Membranes: Synthesis and Improved Gas Separation Performance

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