Membrane Separation
Mostrando 25-36 de 508 artigos, teses e dissertações.
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25. Nanofiltration: ion exchange system for effective surfactant removal from water solutions
A system combining nanofiltration and ion exchange for highly effective separation of anionic surfactant from water solutions was proposed. The subjects of the study were nanofiltration polyethersulfone membranes and ion-exchange resins differing in type and structure. The quality of the treated solution was affected by numerous parameters, such as quality o
Braz. J. Chem. Eng.. Publicado em: 2014-12
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26. Metal nanoparticles/ionic liquid/cellulose: polymeric membrane for hydrogenation reactions
Rhodium and platinum nanoparticles were supported in polymeric membranes with 10, 20 and 40 µm thickness. The polymeric membranes were prepared combining cellulose acetate and the ionic liquid (IL) 1-n-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide (BMI.(NTf)2. The presence of metal nanoparticles induced an increase in the polymeric membrane
Polímeros. Publicado em: 18/04/2014
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27. Solvent recovery from soybean oil/n-butane mixtures using a hollow fiber ultrafiltration membrane
The aim of this work was the study on the separation of soybean oil/n-butane mixtures using a commercial hollow fiber ultrafiltration membrane (50 kDa). Oil/n-butane mixtures with mass ratios of 1:1 and 1:3 (wt), with the feed pressures of 5, 7 and 10 bar and transmembrane pressure of 1 bar were studied. Rejections of oil between 21 to 97.2%, oil fluxes betw
Braz. J. Chem. Eng.. Publicado em: 2014-03
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28. Oxygen air enrichment through composite membrane: application to an aerated biofilm reactor
A highly permeable composite hollow-fibre membrane developed for air separation was used in a membrane aerated biofilm reactor (MABR). The composite membrane consisted of a porous support layer covered with a thin dense film, which was responsible for oxygen enrichment of the permeate stream. Besides oxygen enrichment capability, dense membranes overcome maj
Braz. J. Chem. Eng.. Publicado em: 2013-12
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29. Preparation, characterization and gas permeation study of PSf/MgO nanocomposite membrane
Nanocomposite membranes composed of polymer and inorganic nanoparticles are a novel method to enhance gas separation performance. In this study, membranes were fabricated from polysulfone (PSf) containing magnesium oxide (MgO) nanoparticles and gas permeation properties of the resulting membranes were investigated. Membranes were prepared by solution blendin
Braz. J. Chem. Eng.. Publicado em: 2013-09
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30. Modification of PSf membrane nanostructure using different fabrication parameters and investigation of the CO2 separation properties of PDMS-coated PSf composite membranes
The effects of preparation parameters on the performance and morphology of polydimethylsiloxane/ polysulfone (PDMS/PSf) membranes were investigated. The PDMS layer is mainly used for sealing the defects of the PSf selective layer. The membrane morphologies were characterized by using scanning electron microscopy (SEM). The CO2/CH4 separation performance of m
Braz. J. Chem. Eng.. Publicado em: 2013-06
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31. Parametric study of hydrogen production from ethanol steam reforming in a membrane microreactor
Microreactors are miniaturized chemical reaction systems, which contain reaction channels with characteristic dimensions in the range of 10-500 µm. One possible application for microreactors is the conversion of ethanol to hydrogen used in fuel cells to generate electricity. In this paper a rigorous isothermal, steady-state two-dimensional model was develop
Braz. J. Chem. Eng.. Publicado em: 2013-06
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32. Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3
Nano-assisted inclusion separation of alkali metals from basic solutions was reported by an inclusion-facilitated emulsion liquid membrane process. The novelty of this study is application of nanobaskets of calixcrown in the selective and efficient separation of alkali metals as both the carrier and the surfactant. For this purpose, two diacids, p-tert-butyl
Braz. J. Chem. Eng.. Publicado em: 2012-12
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33. Solvent recovery from soybean oil/n-hexane mixtures using hollow fiber membrane
In this work, the separation of refined soybean oil/n-hexane mixtures was investigated using a commercial hollow fiber ultrafiltration membrane 50 kDa. Three alcohols with different chain lengths were tested for the conditioning of the membrane; n-propyl alcohol showed the highest n-hexane permeate flux after conditioning. There was a decrease in the rejecti
Braz. J. Chem. Eng.. Publicado em: 2012-09
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34. Experimental study of lactose hydrolysis and separation in cstr-uf membrane reactor
In this study, the effect of processing conditions on the performance of continuous stirred tank -ultrafiltration (CSTR-UF) in dead - end mode was investigated. An UF membrane with a molecular weight cutoff of 3 kDa made of regenerated cellulose material was used to separate enzyme from products. The effect of operating pressure ranging between 2 and 5 bar a
Braz. J. Chem. Eng.. Publicado em: 2012-09
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35. Pós-tratamento de efluente têxtil usando coagulação/floculação combinado com processos de separação por membranas
The textile industry uses large volumes of water in their processes, especially in the dyeing step, which are also used large quantities of coloring agents and textile auxiliaries. The presence of these products in the effluent generates a harmful effect and clearly visible to the environment because they cause changes in the parameters of the receiving body
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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36. Preconcentration, determination and speciation of iron by solid-phase extraction using dimethyl (E)-2-[(Z)-1-acetyl)-2-hydroxy-1-propenyl]-2-butenedioate
A new sensitive and selective procedure for speciation of trace dissolved Fe(III) and Fe(II), using modified octadecyl silica membrane disks and determination by flame atomic absorption spectrometry was developed. A ML3 complex is formed between the ligand and Fe(III) responsible for extraction of metal ion on the disk. Various factors influencing the separa
Química Nova. Publicado em: 2012