Supercritical Fluid Extraction
Mostrando 37-48 de 69 artigos, teses e dissertações.
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37. Treatment of materials contaminated with polychlorinated biphenyls (PCBs) by conventional and supercritical fluid xxtraction / Tratamento de materiais contaminados com bifenilas policloradas (PCBS) via extração convencional e fluído supercrítico
A descontaminação de materiais tem sido tema de vários estudos. Um dos fatores que aumenta a poluição é a falta de responsabilidade no descarte do lixo tóxico, como por exemplo, a presença de PCBs (Bifenilas policloradas) no meio ambiente. Nos regulamentos brasileiros, o material contaminado com PCBs nas concentrações acima de 50 ppm deve ser armaz
Publicado em: 2008
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38. Obtention of dairy ingredient enriched in polar lipids from whey buttermilk / Obtenção de ingrediente lacteo enriquecido em lipideos polares a partir de leitelho de soro
O leitelho de soro é um subproduto do processamento de manteiga a partir do creme de soro. Esse subproduto lácteo contém fragmentos da membrana do glóbulo de gordura do leite (MGGL), material rico em componentes com funções nutricionais e efeitos benéficos à saúde, destacando-se os fosfolipídeos. O objetivo desse trabalho foi obter um ingrediente l
Publicado em: 2008
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39. Study About the Potentiality of the Extraction of Natural Products Using Supercritical CO2. / Estudo da Potencialidade da Extração de Produtos Naturais utilizando CO2 Supercrítico.
This study presents a work about different industrial segments that can use extraction with supercritical fluid as one of its stages in this process. Researches were carried out in the pharmaceutical and food development areas so as to evaluate its operation potential, carrying out extractions of substances out of a matrix as, for example, obtaining essentia
Publicado em: 2007
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40. Supercritical Fluid extraction of carotenoids from a freeze-dryed powder of Eugenia uniflora. / Extração de carotenoides de pitanga liofilizada com dioxido de carbono supercritico.
Pitanga (Eugenia uniflora) is a fruit native from Brazil and widely distributed in South America. Nowadays, it is used for obtaining pulps and juices, in spite of this, there are few studies analyzing its antioxidant activity and pharmacological properties. On the other hand, the carotenoids, are widely known for their coloring power, nutritional role, antio
Publicado em: 2007
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41. Extração de oleo de Sacha inchi (Plukenetia volubilis L.) com dioxido de carbono supercritico. / Supercritical CO2 extraction of oil from seeds of Sacha inchi (Plukenetia volubilis L.).
The supercritical fluid extraction of oil from sacha inchi (plukenetia volubilis L.) seeds, using Co2 as a solvent, it is presented in this study. The objective was to investigate the main process parameters such as extraction pressure and temperature, mean particle size of (0,387, 0,595 and 0,842 mm) on the extraction yield. The extraction yield increased a
Publicado em: 2007
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42. Supercritical carbon dioxide extraction of pigments from Bixa orellana seeds (experiments and modeling)
Supercritical CO2 extraction of the pigments from Bixa orellana seeds was carried out in a flow apparatus at a pressure of 200 bar and a temperature of 40 ºC at two fluid flow rates (0.67g/min and 1.12g/min). The efficiency of the extraction was low (only about 1% of the pigment was extracted). The increase in flow rate led to a decrease in pigment recovery
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
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43. Ginger and turmeric starches hydrolysis using subcritical water + CO2: the effect of the SFE pre-treatment
In this work, the hydrolysis of fresh and dried turmeric (Curcuma longa L.) and ginger (Zingiber officinale R.) in the presence of subcritical water + CO2 was studied. The hydrolysis of ginger and turmeric bagasses from supercritical fluid extraction was also studied. The reactions were done using subcritical water and CO2 at 150 bar, 200 °C and reaction ti
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
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44. Supercritical fluid extraction (SFE) of rice bran oil to obtain fractions enriched with tocopherols and tocotrienols
Parboiled rice bran oil was obtained with supercritical CO2 at temperatures and pressures varying from 25 to 60ºC and from 150 to 250 bar, respectively. This study was divided into two different parts: initially, the experiments were carried out with one separation step. In the second part, experiments were performed with two separators in series. The tempe
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
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45. Obtaining extract from the residue of the sugar cane and alcohol industrial using supercritical CO2 : process parameter and estimative of the cost of manufacturing. / Obtenção de extrato proveniente do aproveitamento de residuo da industria sucroalcooleira, utilizando CO2 supercritico : parametros de processo e estimativa do custo de manufatura.
The purpose of this work was to determine the manufacturing cost for the wax extract obtained from residues of the sugar cane and ethanol industry (filter cake), using SFE (Supercritical Fluid Extraction). Experiments were accomplished to determine the global yield isotherms, the overall extraction curves (kinetic of extraction) and to identification chemica
Publicado em: 2006
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46. Development of a Supercritical Fluid Extraction method for simultaneous determination of organophosphorus, organohalogen, organonitrogen and pyretroids pesticides in fruit and vegetables and its comparison with a conventional method by GC-ECD and GC-MS
O presente trabalho tem como objetivo aplicar uma metodologia multiresíduo visando a determinação de pesticidas em frutas e vegetais, utilizando extração com fluido supercrítico e análise por cromatografia gasosa e detector por captura de elétrons e espectrometria de massas. Um método convencional por extração sólido-líquido baseado na literatur
Journal of the Brazilian Chemical Society. Publicado em: 2005-10
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47. Extração de oleos volateis e outros compostos com CO2 supercritico : desenvolvimento de uma metodologia de aumento de escala a partir da modelagem matematica do processo e avaliação dos extratos obtidos / Extration of volateis oils and other composites with Co2 supercriticize : development of a methodology of increase of scale from the matematica modeling of the process and evaluation of gotten extracts
The recovery of extracts from vegetable raw materials with supercritical technology was studied, in order to optimize the process and quality of the products. Three plants were submitted to extraction processes with supercritical carbon dioxide: clove, spiked pepper and vetiver. The yields and compositions of the products obtained by supecritical fluid extra
Publicado em: 2005
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48. Supercritical fluid extraction and separation of coffe active principle / Extração e recuperação dos principios ativos do cafe utilizando fluidos supercriticos
Active principles obtained from natural products are widely used as raw materials for a large number of cosmetics, pharmaceutical and food products. The recovery of these compounds by conventional processes is laborious and in many cases may cause irreversible damages. The versatile supercritical solvents technology rises as an alternative to these processes
Publicado em: 2005