Browsing by Autor "Edgar Vargas"

Now showing 1 - 9 of 9

Collection, characterization and testing of activated carbon fabrics
(2006) Carlos Fernando Estévez Mujica; Juan Carlos Moreno‐Piraján; Edgar Vargas
Construcción de equipos de apoyo docente para Ingeniería Química: una alternativa de aprendizaje integral
(Universidad de Los Andes, 2004) Edgar Vargas; Carlos Rodríguez
Los ingenieros químicos analizan simultáneamente los fenómenos de transporte de materia, calor y movimiento. En el aprendizaje de estos fenómenos, es importante conocer y manejar los modelos matemáticos para aplicarlos al diseño de equipos basados en estas operaciones unitarias. La verificación experimental de estos modelos refuerza notablemente su comprensión. Existe en el mercado una oferta de equipos a escala de laboratorio o planta piloto para ilustrar diversas operaciones unitarias. Estos equipos, de costo relativamente elevado, suelen ser poco versátiles, en el sentido de que el usuario solo puede realizar un conjunto limitado de experimentos con cada equipo. Surge entonces la oportunidad de enfrentar el desarrollo de este tipo de sistemas en un ambiente académico, en un equipo liderado por un profesor y apoyado por estudiantes de último semestre de la carrera, utilizando el espacio de su proyecto de grado. De esta forma, se pueden obtener equipos altamente versátiles, interconectables entre sí, con calidad comercial y a menor costo. Para los estudiantes involucrados en el desarrollo, el beneficio es evidente pues logran llevar a la práctica ejercicios de diseño, construcción y puesta a punto de equipos típicos de la Ingeniería Química. Además, el conocimiento y la tecnología se apropian localmente, facilitando su adaptación a las necesidades del entorno y disminuyendo la dependencia tecnológica.
Construction of support equipments for chemical engineering: an alternative for an integral learning
(2004) Edgar Vargas; Carlos Rodríguez
Estudio de la hidrólisis del crudo de aceite de palma africana empleando como catalizador la lipasa de la levadura C.rugosa
(Universidad de Los Andes, 2005) Miguel Herrera Molano; Diana Riveros; Edgar Vargas
This paper shows the study of the hydrolysis reaction of crude palm oil giving by lipase from Candida rugosa. The studied factors were agitation level, bleaching effect and lipase concentration. Experimentally 79 - 93% hydrolysis were achieved in 2 and a half hour. The reaction rate was increased with the increment of the impeller rotational speed as well as increasing the lipase concentration. Although the literature cites bleaching as a beneficial advantages to enzymatic hydrolysis, this procedure do not have a significant beneficial effect on the reaction.
Obtención, caracterización y ensayo de telas de carbón activas
(Universidad de Los Andes, 2006) Carlos Fernando Estévez Mujica; Juan Carlos Moreno‐Piraján; Edgar Vargas
Activated carbon cloth (ACC) has shown to be one of the most attractive adsorbent materials, due to his excellent adsorption rates, high specific area and lower operational problems when it is compared with other conventional materials, like granular activated carbon. However, ACC production shows elevated costs becoming its principal disadvantage. Under this consideration, this research studies the production of ACC from cotton textiles (an economical raw material) using a combined chemical-thermo activation process, under a variation of two experimental parameters in the chemical activation stage: Humidify time in Phosphoric Acid Solution and Solution Concentration. The characterization of the ACC produced, is obtained by the analysis of the isotherms of adsorption of N2 at 77K, X-ray diffraction and Infrared spectroscopy results. Finally the research evaluates ACC adsorption efficiency when it is used in agro-pesticides on a packed bed system.
Producción de microorganismos probióticos como aditivo para alimentos concentrados para ganado vacuno (primera parte)
(Universidad de Los Andes, 2004) Edgar Vargas; Clara Juliana Gómez; Móníca Eliana Parra; Maria Alexandra Romero
Probiotic bacteria have been recognized as an important alternative to antibiotics and other growth factors used in animals, which have a negative influence on animal and consumer’s health. Preliminar experiments were performed in shaker to obtain the media formulation and the growth kinetics for isolated strains of Lactobacillus spp. and Bifidobacterium spp. Experiments on a 2.7 L batch reactor allowed the study of operation parameters as agitation and aeration, obtaining the highest growth using two 6-paddle Rushton turbines and air flow of 1.4 WM. These results were used to scale-up the batch process to a 50.0 L bioreactor, obtaining a geometrically similar design that produces a cell density of 6.5 g/L in 24 hours of operation, with optimum media and operating conditions, broadening the field of application of probiotics to industries not necessarily related to dairy products.
Producción de microorganismos probióticos como aditivo para alimentos concentrados para ganado vacuno (segunda parte)
(Universidad de Los Andes, 2004) Edgar Vargas; Clara Juliana Gómez; Móníca Eliana Parra; Maria Alexandra Romero
Production of probiotic microorganisms as an additive to cattle feed concentrates (second part)
(2004) Edgar Vargas; Clara Juliana Gómez; Móníca Eliana Parra; Maria Alexandra Romero
For years, industries and research labs have investigated probiotics for nonhuman applications. The use of probiotics as an alternative natural way of enhancing animal performance has shown promising results. Modern farm methods which include rearing conditions and diets induce stress and cause changes in the composition of the microflora, which compromises the animal's resistance to infection. The aim of the probiotic approach is to repair the deficiencies in the microflora and restore the animal's resistance to disease. Improving animal health and performance has always been the goal for farm and livestock producers. For this reason the present study was conducted to develop the microencapsulation of Probiotics (Lactobacillus Thuringenesis and Bifidobacterium Pseudulongum) by the methods of Emulsion and Extrusion, to obtain a daily diet for calves that could offer not only the benefits of a high quality supplement but also the advantages of a product with incorporated probiotics.
Study of the hydrolysis of crude palm oil using lipase from Candida rugosa as the catalyst
(2005) Miguel Molano; Diana Riveros; Edgar Vargas