Hildebrand Solubility Parameter
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Determining hildebrand solubility parameter by ultraviolet spectroscopy and microcalorimetry
O parâmetro de solubilidade (δ) de uma molécula é extremamente importante, visto que novas moléculas são frequentemente desenvolvidas para serem aplicadas em sistemas líquidos. Neste trabalho, nós buscamos técnicas alternativas simples e confiáveis para determinar δ de moléculas de baixa e alta massa molar. Pireno, fenantreno e naftaleno tiveram
J. Braz. Chem. Soc.. Publicado em: 2013-12
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2. Indomethacin solubility estimation in 1,4-dioxane + water mixtures by the extended hildebrand solubility approach
Extended Hildebrand Solubility Approach (EHSA) was successfully applied to evaluate the solubility of Indomethacin in 1,4-dioxane + water mixtures at 298.15 K. An acceptable correlation-performance of EHSA was found by using a regular polynomial model in order four of the W interaction parameter vs. solubility parameter of the mixtures (overall deviation was
Química Nova. Publicado em: 2011-09
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3. Avaliação das incertezas associadas à determinação do parâmetro de solubilidade de Hildebrand de petróleos
Asphaltenes are fractions of crude oils that can precipitate and one of the parameters used in the prediction of the conditions in which this phenomenon occurs is the Hildebrand solubility parameter. In this work, it was evaluated the uncertainty propagation in the experimental determination of the solubility parameter of different crude oils, calculated fro
Química Nova. Publicado em: 2011
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4. Método extendido de Hildebrand en la predicción de la solubilidad del ketoprofeno en mezclas cosolventes etanol + agua
Extended Hildebrand Solubility Approach (EHSA) developed by Martin et al. was applied to evaluate the solubility of ketoprofen (KTP) in ethanol + water cosolvent mixtures at 298.15 K. Calculated values of molar volume and solubility parameter for KTP were used. A good predictive capacity of EHSA was found by using a regular polynomial model in order five to
Química Nova. Publicado em: 2010
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5. HILDEBRAND SOLUBILITY PARAMETERS OF THE OIL AND MIXING OIL-HEPTANE ON THE THRESHOLD OF THE PRECIPITATION EMPLOYEE ASPHALTENES MICROSCOPY OPTICS AND SPECTROSCOPY A NEAR-INFRARED (NIR) / PARÂMETROS DE SOLUBILIDADE DE HILDEBRAND DOS PETRÓLEOS E DA MISTURA PETRÓLEO-HEPTANO NO LIMIAR DA PRECIPITAÇÃO DOS ASFALTENOS EMPREGANDO MICROSCOPIA ÓPTICA E ESPECTROSCOPIA DE INFRAVERMELHO-PRÓXIMO (NIR)
The Hildebrand solubility parameter is used to express the compatibility of petroleum in mixtures, starting from the principle that, independently from the system composition, the asphaltenes always precipitate in a certain solubility parameter, known as the flocculation parameter, which estimated value is 16,35 (MPa)1/2. In this paper, it was tried to exper
Publicado em: 2009
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6. Biocatalytic synthesis of acrylates in supercritical fluids: tuning enzyme activity by changing pressure.
Supercritical fluids are a unique class of nonaqueous media in which biocatalytic reactions can occur. The physical properties of supercritical fluids, which include gas-like diffusivities and liquid-like densities, can be predictably controlled with changing pressure. This paper describes how adjustment of pressure, with the subsequent predictable changes o