Navegando por Autor "Fernandes, Fabiano A. N."
Agora exibindo 1 - 3 de 3
- Resultados por página
- Opções de Ordenação
Artigo Modeling of partial oxidation of methane in a membrane reactor(Revista da Engenharia Térmica, 2006) Fernandes, Fabiano A. N.; Souza, Carlson Pereira de; Sousa, João Fernandes dePartial oxidation of methane is one of the most important chemical processes for the production of syngas. In recent years, the abundant availability of natural gas and the increasing demand of hydrogen have led to high interest to further develop this process increasing the yield of syngas. In this work the partial oxidation of methane was studied from a modeling point of view in a membrane reactor and in a conventional reactor. A mathematical model of a membrane reactor used for partial oxidation of methane, assuming steadystate conditions, was developed to simulate and compare the maximum yields and operating conditions in the reactor with that in a conventional reactor. Simulation results show that different parameters affect methane conversion and H /CO ratio, such as temperature, operating conditions, and membrane 2 parameters such as membrane permeance. In a membrane reactor an increase in the operating pressure corresponds to an increase in methane conversion, since allows for a greater partial pressure gradient between the reaction and permeate zone, thus contributing to shift the equilibrium towards the products. As such, the membrane reactors are a good alternative to produce syngas especially for GTL processes. Operating conditions can be set to control the H2/CO ratio to a desired value, and high conversions at mild temperatures can be achieved reducing capital and operational costsArtigo Optimization of osmotic dehydration of papaya followed by air-drying(Food Research International, 2006) Fernandes, Fabiano A. N.; Rodrigues, Sueli; Gaspareto, Odisséia C. P.; Oliveira, Edson Leandro deArtigo Optimization of osmotic dehydration of tomatoes in a ternary system followed by air-drying(Elsevier, 2007-12) Souza, Josilma Silva de; Medeiros, Maria de Fátima Dantas de; Magalhães, Margarida Maria dos Anjos; Rodrigues, Sueli; Fernandes, Fabiano A. N.Osmotic dehydration and air drying technology represent a technique that can reduce post-harvest loss of fruits and vegetables. In this work the influence of osmotic solution composition (water/sugar/salt) and temperature on the osmotic dehydration of tomatoes (Lycopersicum esculentum) were examined. Tomatoes with and without skin were studied. The process of osmotic dehydration followed by air-drying was studied and modeled, so it could be optimized aiming the reduction of total processing time. The results showed the advantage of two different processes for the tomatoes with skin and without skin. Tomatoes without skin are processed faster using air-drying without submitting the fruit to osmotic dehydration. Whereas, the tomatoes with skin dry faster when submitted to an osmotic solution consisting of 35% of sucrose and 5% of salt at 60 °C prior to air-drying