Browsing by Author "Moreno Delgado, Juan Fernando"

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Kinetic Modeling of Mead Production
(2023) Garcia Zea, Gustavo Francisco
This work studies the fermentation kinetics to produce mead using Saccharomyces cerevisiae, selected from three commercial yeasts to generate a product with better organoleptic characteristics and greater acceptance by a group of untrained tasters. The values of the kinetic parameters of the fermentation were obtained from a series of fermentations at laboratory scale, maintaining constant the initial concentration of biomass (1.5 g/L), the operating temperature (33 ºC) and the pH (4) and varying the initial soluble solids concentration in four values (10, 16, 22 and 25 ºBrix). Based on the experimental results, a mathematical modeling was developed to estimate the variables of interest. Thus, from the application of the Monod model, the saturation constant (Ks) of 336.6 g/L was obtained, with a maximum specific growth rate (μ_max) of 0.071 h-1. Using the integrated logistic model, the experimental values were adjusted to obtain the average value of μ_max of 0.0815 h-1. Finally, the maximum ethanol production rate (rpm) of 0.2621 g/L was obtained through the modified Gompertz model. Therefore, Monod, integrated logistic and modified Gompertz models were ideal mathematical tools to interpret the kinetic behavior of honey fermentations, predict and control this process, both on a laboratory scale and on a subsequent industrial scale. Thus, contributing to the knowledge of the dynamic behavior of mead production and its level of technological development.
Propuesta de diseño de una planta de tratamiento de aguas amargas proveniente de la refinación del petróleo aplicando el simulador Aspen Plus®
(2019-05-06) Moreno Delgado, Juan Fernando; Delgado Noboa, Jorge Washington
The aim of this research is a design proposal for a sour water treatment plant applying the Aspen Plus® process simulator. Bitter water is the effluent of some of the fundamental processes within oil refinement, such as: fluid catalytic cracking, hydro-treatment, hydrodesulphurization and visco-reduction. Bitter water has a high percentage of ammonia and sulfuric acid that in order to be eliminated into natural sources must first undergo treatment in which said components are separated. For the simulation a bitter water capacity of 36000 kg/h was established with an ammonia concentration of 5000ppm and a sulfuric acid concentration of 1000ppm based on data gathered on our technical visit at the Esmeraldas State Refinery. For the simulation the NRTL thermodynamic model was used. The key equipment to accomplish the goal of removing contaminants from bitter water is the exhaust column, which was initially designed from a basic model DSTWU to obtain the necessary parameters, such as the number of stages, supply stage, reflux and warming service in the reboiler. Once the initial parameters had been obtained a 21 stage RADFRAC rigorous column was designed, with supply at stage 8, without a condenser and with a thermosiphon reboiler, from where the scrubbed water exits with a NH3 concentration of 0,0137ppm and 2,1290e-13ppm of H2S, which complies with what is established in the ECUADORIAN NORMS FOR ENVIORNMENTAL QUALITY AND DISCHARGES OF EFFLUENTS.