Equilibrium Conversion
Mostrando 13-24 de 110 artigos, teses e dissertações.
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13. Simulation of styrene polymerization reactors: kinetic and thermodynamic modeling
A mathematical model for the free radical polymerization of styrene is developed to predict the steady-state and dynamic behavior of a continuous process. Special emphasis is given for the kinetic and thermodynamic models, where the most sensitive parameters were estimated using data from an industrial plant. The thermodynamic model is based on a cubic equat
Brazilian Journal of Chemical Engineering. Publicado em: 2008-06
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14. Experimental characterization of a reactor nozzles injetores of fast pirolise to waste conversion in refineries / Caracterização experimental de bicos injetores de um reator de pirolise rapida para conversão de residuo em refinarias
This thesis presents an analysis of problems of linear elastic fracture mechanics in anisotropic bimaterial structures. Using the boundary element method, it is possible to evaluate stress intensity factors in plane problems (2D) due to the presence of interfacial cracks between the laminae that constitute the material, when the structure is submitted to a m
Publicado em: 2008
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15. Síntese, caracterização e aplicação de catalisadores mistos contendo cobalto e cobre
Studies on the use of catalysts have been directed to develop new processes taking into consideration the economic point of view (for example, substitution for cheaper raw materials) as well as the green chemistry aspects. The majority of supported catalysts is prepared by the impregnation method of the metallic salt over a material of high specific surface
Publicado em: 2007
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16. Determination of critical conditions for the esterification of acetic acid with ethanol in the presence of carbon dioxide
In this work, we present the calculation of critical coordinates for the esterification of acetic acid with ethanol in compressed carbon dioxide. Determination of the critical pressure for this system is useful, since the conversion of this reaction increases with pressure in the two-phase region, reaching a maximum at the critical point. We used a calculati
Brazilian Journal of Chemical Engineering. Publicado em: 2006-09
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17. A general creation-annihilation model with absorbing states
A one dimensional non-equilibrium stochastic model is proposed where each site of the lattice is occupied by a particle, which may be of type A or B. The time evolution of the model occurs through three processes: autocatalytic generation of A and B particles and spontaneous conversion A -> B. The two-parameter phase diagram of the model is obtained in one-
Brazilian Journal of Physics. Publicado em: 2005-06
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18. Reforma a vapor do metano para produção de hidrogênio: estudo termodinâmico e protótipo de modelo matemático de reator com membrana
A reforma a vapor do metano é o método industrial dominante na produção de hidrogênio. As reações de reforma a vapor são altamente endotérmicas e o reator deve operar a altas temperaturas a fim de se obter conversões razoáveis. O uso de reator com membrana torna possível realizar as reações de reforma a vapor a temperaturas mais moderadas atrav
Publicado em: 2005
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19. Intensificated process of hydrolysis of penicillin G and purification of the products in a multi-stage couter-current reactor / Processo intensificado de hidrolise enzimatica de penicilina G e purificação dos produtos em reator multi-estagio e contra-corrente
This work studies the enzymatic hydrolysis of penicillin G (PenG) into 6-aminopenicillanic acid (6-APA) and phenylacetic acid (PAA). In a multi-stage countercurrent reactor and at low pH, the enzymatic reaction takes place in the aqueous phase and the products are separated between the aqueous phase and organic phase (butyl acetate - BuAc). Furthermore, 6-AP
Publicado em: 2004
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20. Conversion of a deasphalting unit for use in the process of supercritical solvent recovery
In order to reduce energy consumption and to increase deasphalted oil yield, an old PETROBRAS deasphalting unit was converted for use in the process of supercritical solvent recovery. In-plant and pilot tests were performed to determine the ideal solvent-to-oil ratio. The optimum conditions for separation of the supercritical solvent from the solvent-plus-oi
Brazilian Journal of Chemical Engineering. Publicado em: 2000-09
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21. Hydrogenation of diesel aromatic compounds in supercritical solvent environment
Reactions under supercritical conditions have been employed in many processes. Furthermore, an increasing number of commercial reactions have been conducted under supercritical or near critical conditions. These reaction conditions offer several advantages when compared to conditions in conventional catalytic processes in liquid-phase, gas-liquid interface,
Brazilian Journal of Chemical Engineering. Publicado em: 2000-09
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22. Estrategias numericas para solução de modelos de não-equilibrio para absorção gasosa com reações quimicas complexas (regime estacionario e dinamico)
Gas absorption with chemical reactions is a very common industrial separation processo Until now the traditional equilibrium stage model have been the main tools to the design and unsteady state simulations of the gas-liquid contact equipment. The nonequilibrium model based on mass transfers fundamentais presents a more realistic description of the gas-liqui
Publicado em: 2000
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23. Gene Conversion, Linkage, and the Evolution of Multigene Families
The evolution of the probabilities of genetic identity within and between the loci of a multigene family is investigated. Unbiased gene conversion, equal crossing over, random genetic drift, and mutation to new alleles are incorporated. Generations are discrete and nonoverlapping; the diploid, monoecious population mates at random. The linkage map is arbitra
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24. Interchromosomal Biased Gene Conversion, Mutation and Selection in a Multigene Family
A mathematical model of the effects of interchromosomal biased gene conversion, mutation and natural selection on a multigene family is developed and analyzed. The model assumes two allelic states at each of n loci. The effects of genetic drift are ignored. The model is developed under the assumption of no recombination, but the analysis shows that, at equil