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Utilización de hormigón reciclado (RCA) como árido para microaglomerados asfálticos en frío destinados a tratamientos de mantención de pavimentos
(Universidad de Chile, 2012)
3. Granulometría para microaglomerados en frio. ............................................... 21
Tabla 4. Energía usada en secar y calentar áridos húmedos. ....................................... 26
Tabla 5. Comportamiento del árido según valor...
siguientes empresas: Empresa Nacional de Energía ENEX S.A. Productos Bituminosos S.A. Asfaltos Chilenos S.A. Química Latinoamericana S.A. (c) Para la caracterización de los materiales y diseño de las mezclas, se utilizará los Volúmenes Nº 5 y...
siguientes empresas: Empresa Nacional de Energía ENEX S.A. Productos Bituminosos S.A. Asfaltos Chilenos S.A. Química Latinoamericana S.A. (c) Para la caracterización de los materiales y diseño de las mezclas, se utilizará los Volúmenes Nº 5 y...
Análisis técnico jurídico de los acuerdos de producción limpia que permita la reducción de los residuos en la actividad metalúrgica, sector fundiciones
(Universidad de Chile, 2018)
proporcionado por energía eléctrica, es decir, desleír un
metal para obtener una o varias piezas de dimensiones y características bien definidas.
1De acuerdo a informe sobre el Producto Interno Bruto...
5 CARTES Zurita, Oscar, Residuos Peligrosos, Curso Impartido en el Instituto Nacional de Hidráulica (INH). Disponible en: http://www.inh.cl/ o en: en:http://www.inh.cl/home/documents/library/Apuntes%20Curso%20Residuos%20Peligrosos%20 Prof.%20...
5 CARTES Zurita, Oscar, Residuos Peligrosos, Curso Impartido en el Instituto Nacional de Hidráulica (INH). Disponible en: http://www.inh.cl/ o en: en:http://www.inh.cl/home/documents/library/Apuntes%20Curso%20Residuos%20Peligrosos%20 Prof.%20...
Registro del estudio pionero en Chile de aisladores sísmicos elastoméricos para aplicación en edificios de baja altura
(Universidad de Chile, 2016)
soportar los esfuerzos mediante el refuerzo
de elementos de la estructura y la eventual plastificación o ruptura de éstos para liberar la
energía transmitida por el sismo.
Una forma de aumentar el período propio de una estructura y por ende reducir las...
solución debe obligadamente incluir un sistema de amortiguamiento que disipe la energía transmitida, para que las oscilaciones no se amplifiquen provocando el colapso del edificio. Los estudios efectuados en Japón, Nueva Zelandia, Francia y EEUU...
solución debe obligadamente incluir un sistema de amortiguamiento que disipe la energía transmitida, para que las oscilaciones no se amplifiquen provocando el colapso del edificio. Los estudios efectuados en Japón, Nueva Zelandia, Francia y EEUU...
Metodología para Determinar Calidad Natural en Acuiferos
(Universidad de ChileCyberDocs, 2010)
. ....................................................................................... 77
4.2.2 Equilibrio y energía Libre. ..................................................................................... 78
4.2.3 Gases Disueltos...
Estudio Sedimentológico de la Cuenca de Magallanes Durante el Cretácico Temprano
(Universidad de ChilePrograma Cybertesis, 2009)
el área de estudio
corresponde a un estuario mixto, dominado principalmente por las mareas, con un aporte
considerable de la energía de las olas en el frente del mismo.
La interacción de la litología de los altos, el ambiente sedimentario, la...
pendiente y la tectónica condiciona el tipo de arena a depositar. Los subambientes sedimentarios de alta energía son condicionantes para arenas limpias, puesto que el retrabajo de las olas permite la alta madurez y buena selección. Existe una relación...
pendiente y la tectónica condiciona el tipo de arena a depositar. Los subambientes sedimentarios de alta energía son condicionantes para arenas limpias, puesto que el retrabajo de las olas permite la alta madurez y buena selección. Existe una relación...
Diseño de nuevas microcápsulas poliméricas para la remoción de metales pesados desde soluciones acuosas acidas diluidas mediante un sistema continuo de extracción
(Universidad de Chile, 2014)
termodinámico se estudió la Energía de Activación, parámetro fundamental para determinar cuál es la etapa que controla el proceso desde el punto de vista cinético, en este mecanismo de adsorción del metal en la microcápsula basado en un proceso de transferencia...
This doctoral thesis had as general objective to develop a study of extraction and concentration of metallic ions present in dilute synthetic aqueous solutions that simulate industrial and mining waters. The proposed study is based on the application of the innovative technology of Microencapsulation of Extractants (MCEx), and that in its final stage allowed to develop a Metals Extraction System in Continuous Columns at laboratory scale. The mechanism of adsorption and desorption of metals on microcapsules was studied, using continuous and discontinuous systems, including the determination of kinetic and thermodynamic parameters. Basically, the microcapsules (MC) were prepared by two simple and low-cost methods: a physical-mechanical one (evaporation of the solvent) and a chemical one (in situ polymerization employing the extractant as initial material). Once prepared, these MC contained retained in their internal structure, non-specific extractant molecules which present acid or basic or neutral character, capable to recover or remove metals. Fairly good results of synthesis of microcapsules retaining acid and neutral extractants were measured (approximately 80% yield), and low results for microcapsules containing basic extractants (between 30-70% yield, approximately). Different adsorption isotherm models were used to determine maximum capacities of extraction of metals of the different microcapsules. Among them, Langmuir, Freundlich and Redlich-Peterson isotherms, the latter showing the best results of fitting the experimental values. The kinetic adsorption behaviour of the microcapsules was also studied, given the importance of determining the needed time to reach maximum metal adsorption at different temperature conditions, as well as to determine adsorption rate parameters necessary for scaling and simulating the sorption process on a larger scale. In order to do this, a pseudo-second order model (Ho) and a pseudo-first order model (Lagergren) were used, both mixed models that reflect that the kinetic control of the process can be governed by the chemical reaction between the metal and the extractant and also by the diffusion stages of the participating species towards and from the reaction site. Associated with the above mentioned, from the thermodynamic point of view, the energy of activation was studied and measured, fundamental parameter to determine which is the stage that controls the process from a kinetic point of view, in this mechanism of adsorption of metal on the microcapsule, based in a mass transference process with chemical reaction. From the observed experimental results and their corresponding analysis, it was determined that a mix system governs the process, meaning, it is shared between the chemical reaction and the diffusion of the metal in the aqueous film adjacent to the microcapsule, and the intraparticle diffusion of the complex inside the microcapsule. In addition, the Gibbs free-energy was determined, being observed that the adsorption of metal on microcapsules is spontaneous, having processes governed by the enthalpy and other controlled by the entropy. Considering that the practical application of these microcapsules is addresseed to the decontamination of industrial wastewater, a continuous adsorption treatment system was also developed at laboratory scale, so as to determine necessary and important parameters for a future industrial scaling-up. With this objective in mind, adsorption experiments were developed, being circulate the aqueous solution to be treated over a glass column properly packed with the synthetized microcapsules. Once the microcapsules were saturated with the metallic ion to be removed, the processes continued with the desorption-stage of the metal from the microcapsules, by contact them with suitable aqueous solutions, conducting this way repetitive cycles of adsorption and desorption to verify the possibility of reusing the microcapsules. The experimental results achieved were analysed by applying different continuous columns adsorption-models (Dose-Response, Wang and Thomas), which, in general, adjusted well the experimentally obtained data, obtaining kinetics and transport parameters required for simulating the process. As global conclusion, it can be mentioned that microencapsulation of extractants in polymeric matrices is effective as an efficient, simple and low-cost adsorption methodology, with improved properties compared with other natural or synthetic adsorbents of metallic ions, acting the microcapsules as granular adsorbents, easily regenerated and recycled to new adsorption-desorption cycles, which also present a high load capacity of several metallic ions...
This doctoral thesis had as general objective to develop a study of extraction and concentration of metallic ions present in dilute synthetic aqueous solutions that simulate industrial and mining waters. The proposed study is based on the application of the innovative technology of Microencapsulation of Extractants (MCEx), and that in its final stage allowed to develop a Metals Extraction System in Continuous Columns at laboratory scale. The mechanism of adsorption and desorption of metals on microcapsules was studied, using continuous and discontinuous systems, including the determination of kinetic and thermodynamic parameters. Basically, the microcapsules (MC) were prepared by two simple and low-cost methods: a physical-mechanical one (evaporation of the solvent) and a chemical one (in situ polymerization employing the extractant as initial material). Once prepared, these MC contained retained in their internal structure, non-specific extractant molecules which present acid or basic or neutral character, capable to recover or remove metals. Fairly good results of synthesis of microcapsules retaining acid and neutral extractants were measured (approximately 80% yield), and low results for microcapsules containing basic extractants (between 30-70% yield, approximately). Different adsorption isotherm models were used to determine maximum capacities of extraction of metals of the different microcapsules. Among them, Langmuir, Freundlich and Redlich-Peterson isotherms, the latter showing the best results of fitting the experimental values. The kinetic adsorption behaviour of the microcapsules was also studied, given the importance of determining the needed time to reach maximum metal adsorption at different temperature conditions, as well as to determine adsorption rate parameters necessary for scaling and simulating the sorption process on a larger scale. In order to do this, a pseudo-second order model (Ho) and a pseudo-first order model (Lagergren) were used, both mixed models that reflect that the kinetic control of the process can be governed by the chemical reaction between the metal and the extractant and also by the diffusion stages of the participating species towards and from the reaction site. Associated with the above mentioned, from the thermodynamic point of view, the energy of activation was studied and measured, fundamental parameter to determine which is the stage that controls the process from a kinetic point of view, in this mechanism of adsorption of metal on the microcapsule, based in a mass transference process with chemical reaction. From the observed experimental results and their corresponding analysis, it was determined that a mix system governs the process, meaning, it is shared between the chemical reaction and the diffusion of the metal in the aqueous film adjacent to the microcapsule, and the intraparticle diffusion of the complex inside the microcapsule. In addition, the Gibbs free-energy was determined, being observed that the adsorption of metal on microcapsules is spontaneous, having processes governed by the enthalpy and other controlled by the entropy. Considering that the practical application of these microcapsules is addresseed to the decontamination of industrial wastewater, a continuous adsorption treatment system was also developed at laboratory scale, so as to determine necessary and important parameters for a future industrial scaling-up. With this objective in mind, adsorption experiments were developed, being circulate the aqueous solution to be treated over a glass column properly packed with the synthetized microcapsules. Once the microcapsules were saturated with the metallic ion to be removed, the processes continued with the desorption-stage of the metal from the microcapsules, by contact them with suitable aqueous solutions, conducting this way repetitive cycles of adsorption and desorption to verify the possibility of reusing the microcapsules. The experimental results achieved were analysed by applying different continuous columns adsorption-models (Dose-Response, Wang and Thomas), which, in general, adjusted well the experimentally obtained data, obtaining kinetics and transport parameters required for simulating the process. As global conclusion, it can be mentioned that microencapsulation of extractants in polymeric matrices is effective as an efficient, simple and low-cost adsorption methodology, with improved properties compared with other natural or synthetic adsorbents of metallic ions, acting the microcapsules as granular adsorbents, easily regenerated and recycled to new adsorption-desorption cycles, which also present a high load capacity of several metallic ions...
Plan de negocios para la comercializacion de servicio de información y transferencia tecnológica
(Universidad de Chile, 2015)
Plan de negocio para el mejor desempeño de una Consultora de Seguridad Industrial en el mercado peruano
(Universidad de Chile, 2019)
Alta Integridad (HIPPS)
y los Sistemas de Cierre de Emergencia (ESD). Por usuarios finales hace referencia al
rubro, como petróleo y gas, sanidad, minería, generación de energía, papel y celulosa,
energía, productos químicos, entre otros. Y, por...
características de los servicios están relacionadas con el rubro del cliente y el tamaño. En el rubro minero y de energía, las regulaciones relativas a seguridad son muy estrictas y con estándares muy bien definidos que deben cumplir para poder operar, haciendo...
características de los servicios están relacionadas con el rubro del cliente y el tamaño. En el rubro minero y de energía, las regulaciones relativas a seguridad son muy estrictas y con estándares muy bien definidos que deben cumplir para poder operar, haciendo...
Balance comparativo de volumen de edificios volcanicos en la zona volcánica sur
(Universidad de Chile, 2016)
8. A) EJEMPLO DE ESPECTRO DE RAYOS GAMMA SEÑALANDO LA POSICIÓN DE LAS VENTANAS
CONVENCIONALES DE ENERGÍA RESPECTIVA PARA CADA ELEMENTO (NICOLET & ERDI-KRAUSZ 2003). B)
ESPECTRÓMETRO DE RAYOS GAMMA RS120...
satisfacer su creciente demanda energética. En un contexto global que incentiva vigorosamente la utilización de energía sustentable, es imperativo encontrar nuevas fuentes de energía que puedan suplir esta demanda y que, a la vez, cumplan con estándares de...
satisfacer su creciente demanda energética. En un contexto global que incentiva vigorosamente la utilización de energía sustentable, es imperativo encontrar nuevas fuentes de energía que puedan suplir esta demanda y que, a la vez, cumplan con estándares de...
Caracterización hidrogeoquímica de recursos hídricos de la cuenca de Santiago
(Universidad de Chile, 2015)
Hidrológico Operacional-Cuencas Río Maipo-Mapocho para la DGA.
En este trabajo se estimó la geometría y las características hidráulicas de los
principales acuíferos presentes en el relleno sedimentario de la cuenca del río
Maipo, llegando a definir 3...
acuíferos, concluyendo que la segunda unidad (desde la superficie hacia bajo) es la que presenta las características hidráulicas adecuadas. Posteriormente, Iriarte (2003) desarrolló un estudio en el sector norte de la ciudad de Santiago con el objetivo...
acuíferos, concluyendo que la segunda unidad (desde la superficie hacia bajo) es la que presenta las características hidráulicas adecuadas. Posteriormente, Iriarte (2003) desarrolló un estudio en el sector norte de la ciudad de Santiago con el objetivo...