Membrane Separation Process
Mostrando 37-48 de 71 artigos, teses e dissertações.
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37. Use of reverse osmosis membranes for the separation of lemongrass essential oil and supercritical CO2
Although it is still used very little by industry, the process of essential oil extraction from vegetable matrices with supercritical CO2 is regarded as a potentially viable technique. The operation of separating the extract from the solvent is carried out by reducing the pressure in the system. Separation by membranes is an alternative that offers lower ene
Brazilian Journal of Chemical Engineering. Publicado em: 2004-06
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38. Preparação, caracterização e aplicação de membranas de poli (fluoreto de vinilideno) para a redução de cor de efluente textil modelo
The textile industry processes deal with many different materiais being responsible for a large volume of potential pollutant streams, mainly due to losses of dyes occurring during the dyeing process of the fibers, which are discarded in the effluent. Membrane separation processes are considered potential good new alternatives for the treatment of textile ef
Publicado em: 2004
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39. Preparação, caracterização e aplicações do material celulose-oxido de zirconio
This work describes the preparation and characterization of the cellulose (Cel) and cellulose acetate (Acel) fibers and cellulose acetate film (Macel) coated with ZrO2. Furthermore, they were modified by reacting phosphoric acid, resulting in the modified materials: Cel/ZrO2/Phosphate and Acel/ZrO2/Phosphate fibers and Macel/ZrO2/Phosphate films. The zirconi
Publicado em: 2003
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40. Development and characterization of microfiltration hollow-fiber modules for sterilization of fermentation media
Sterilization of fermentation medium involving heat may result in undesirable chemical reactions that alter nutrient concentration and yield products, which interfere in the fermentation performance. Sterilization of heat-sensitive compounds usually involves separate sterilizations of carbon source and nutrient solution. Membrane separation processes are an
Brazilian Journal of Chemical Engineering. Publicado em: 2002-04
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41. Modelagem e simulação de processos de separação de misturas gasosas multicomponentes utilizando modulos de membranas de fibra-oca
Separation of gaseous mixtures using membranes is a known operation. Even so, only recently is receiving enough attention, mainly due to the great development obtained in the polymeric material science. Nowadays, this process is applied in industrial scale for production of high purity nitrogen from air and for hydrogen recovery from hydrocarbon mixtures in
Publicado em: 2002
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42. Aplicação dos processos de separação por membranas para produção de suco clarificado e concentrado de camu camu (Myrciaria dubia)
The objective of this thesis was to evaluate membrane separation processes for the clarification and concentration of camu camu juice. The juice obtained by the de-pulping of the fruit was initially submitted to an enzyme treatment to reduce the viscosity and facilitate the following process of clarification. Clarification was carried out using microfiltrati
Publicado em: 2002
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43. Estudo da utilização dos processos de separação por membranas para obtenção de suco de acerola clarificado e concentrado
Acerola juice clarification was studied using membrane separation processes. Single strength acerola juice and enzymatically treated juice were processed employing microfiltration and ultrafiltration membrane systems at different transmembrane pressures. In spite of the fact that the juice obtained by ultrafiltration presented a lower haze value than the one
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/09/1999
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44. Extração de acidos carboxilicos atraves de membranas : (perstração)
Recovering or elimination of organic acids from dilute solutions is today a hard separation problem. They are main products in several chernical and food industry processes and may also act as inhibitors in other biomass processes. In this work, pertraction was introduced as an alternative method for organic acid separation. Pertraction is a dialytic extract
Publicado em: 1995
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45. Production of inulinase: recovery and scale-up / Obtenção de inulinase: recuperação e ampliação de escala
It has been observed that the production of extracellular inulinase by Candida kefyr DSM 70106 was markedly affected by the rate of oxygen transfer to the medium. The highest inulinase activity (37,5 U.Ml-1) was attained at a KLa value (volumetric coefficient of oxygen transfer) equal to 43 h-1. As such, KLa was chosen as a criterion for scaling-up the biore
Publicado em: 1995
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46. Cell Separation in Blue-Green Bacteria1
Autolysin-like enzymes appear to be responsible for cell separation in Agmenellum quadruplicatum. Mutants that are impaired in cell separation and grow as chains exhibit reduced cell lytic activity. Lysozyme, extracted autolysin, and antibiotics that affect peptidoglycan synthesis phenotypically suppress chain formation. Various aspects of the regulation of
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47. Membrane-mediated structural transitions at the cytoplasmic face during integrin activation
Cytoplasmic face-mediated integrin inside-out activation remains a paradigm in transmembrane signal transduction. Emerging evidence suggests that this process involves dissociation of the complex between the integrin cytoplasmic tails; however, a dynamic image of how it occurs on the membrane surface remains elusive. We show here that, whereas membrane-proxi
National Academy of Sciences.
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48. Sites of Cellular Autolysis in Lactobacillus acidophilus
Ultrastructural changes which occur during cellular autolysis of Lactobacillus acidophilus strain 63AM Gasser in 0.05 M citrate buffer, pH 5.0, were examined. Early in the process, randomly distributed electron-dense patches were seen on the wall surface, along with an accompanying eversion of mesosomes. Later, after a loss of about 20% of the initial cellul