Solid Vapor Equilibrium
Mostrando 1-8 de 8 artigos, teses e dissertações.
-
1. Determinação do coeficiente de atividade na diluição infinita em sistemas etanol-água-sal por microextração em fase sólida-gc-fid
A new method using the headspace solid phase microextraction (HS-SPME) technique was used to evaluate the infinite dilute activity coefficient (γ1∞) in an alcohol/water/salt system. The studied systems were ethanol and water with NaCl and NH4Cl at salt concentrations of 5, 10, 15, and 30% m/v and temperatures of 303.15 and 313.15 K. The method was used to
Quím. Nova. Publicado em: 2014
-
2. Aplicação do método da minimização da energia de Gibbs no cálculo de equilíbrio químico e de fases em sistemas eletrolíticos / Application method of the Gibbs energy minimization to calculation of phase and chemical equilibrium in electrolyte systems
In several industrial applications are used mixtures containing different solutes, often these solutes are non-volatile, such as electrolytes. The phase and chemical equilibrium in these processes occur in the various unit operations. The stages of production, as well as the separation and purification steps are critical to product quality. Thus, the calcula
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2011
-
3. A subdivision algorithm for phase equilibrium calculations at high pressures
Phase equilibrium calculations at high pressures have been a continuous challenge for scientists and engineers. Traditionally, this task has been performed by solving a system of nonlinear algebraic equations originating from isofugacity equations. The reliability and accuracy of the solutions are strongly dependent on the initial guess, especially due to th
Brazilian Journal of Chemical Engineering. Publicado em: 2007-12
-
4. Modelagem e simulação da formação de hidratos de metano: um estudo do equilíbrio termodinâmico sólido-líquido-vapor / Modeling and simulation of methane hydrates: a study of solid-liquid-vapor equilibrium phase
O objetivo do presente trabalho é apresentar um estudo sobre o equilíbrio de fases sólido-líquido-vapor para hidratos de metano. A análise do equilíbrio trifásico sólido-líquido-vapor tem encontrado diversas aplicações para sistemas hidrocarboneto-água, uma vez que permite, por exemplo, a determinação da região de estabilidade de hidratos de m
Publicado em: 2007
-
5. Modelagem do equilibrio de fases em misturas de dioxido de carbono supercritico e compostos presentes em produtos naturais / Phase equilibria modeling of mixtures of supercritical carbon dioxide and compounds present in natural products
Modeling and simulation of supercritical extraction processes request a good prediction of conditions of phase equilibrium, conditions that determine the higher concentration of liquid or solid (solute) to be extracted by supercritical fluid (solvent). The main problem in modeling of systems found in supercritica1 extraction processes is the great size diffe
Publicado em: 2002
-
6. Estudo da sintese e hidrolise de acetato de etila em fase gasosa catalisada por enzimas suportadas
Enzymes supported in a solid phase catalyzing reactions with substrates and products in gaseous phase constitute a recent progress in the biotechnology. It has technological applications that include: toxic gas remediation, biosensors and synthesis of pharmaceutical, fragrances and aromas for the food industry and cosmetics. This work presents, the experimen
Publicado em: 2002
-
7. Parameter estimation of thermodynamic models for high-pressure systems employing a stochastic method of global optimization
This paper presents the utilization of a stochastic global optimization method for the problem of parameter estimation in thermodynamic models. The method is based on an adaptation of the simulated annealing method to continuous variables. The proposed approach is applied to a vapor-solid equilibrium with supercritical carbon dioxide as solvent. Numerical re
Brazilian Journal of Chemical Engineering. Publicado em: 2000-09
-
8. Modelagem da extração supercritica de oleos essenciais
This work presents complementary and auxiliary methodologies for modeling supercritical extraction of essential oils. The first methodology consists of a mathematical procedure to obtain the fugacity coefficients, from any equation of state. These coefficients are necessary for thermodynamic modeling of the supercritical extraction. This procedure allows to
Publicado em: 1999