8 results on '"Muñoz Hernández, José A."'
Search Results
2. Analysis of coal conversion to biomass as a transitional technology
- Author
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Bunn, Derek W., Redondo-Martin, Jorge, Muñoz-Hernandez, José I., and Diaz-Cachinero, Pablo
- Published
- 2019
- Full Text
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3. Development of electrooxidation cells with recovered carbon, for its possible application in the removal of 17-α-ethinyl estradiol from water.
- Author
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Muñoz-Hernández, José Alejandro, Saldarriaga-Noreña, Hugo, Reyes-Romero, Pedro Guillermo, Murillo-Tovar, Mario Alfonso, and Vergara-Sánchez, Josefina
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ELECTRIC batteries ,ESTRADIOL ,SODIUM bisulfite ,CARBON ,ELECTRIC motors - Abstract
In this work, various electrochemical cells were developed from carbons recovered from mechanical seal carbons, electric motor brush carbons (MBC) and AA battery carbons (BC). After the different types of carbons were conditioned, three electrooxidation devices were assembled, where the carbons were used as anode, and the cathode was stainless steel 304 SS. In each of the devices, three different separations between the anode and the cathode were considered: 1/8”, 3/16” and 1/4”. The electrical characterization of each of the cells was carried out using a sodium bisulfite solution (NaHSO
3 ), with and without system agitation. The results indicated that agitation was not a factor that significantly affected the voltage conduction. The voltametric behavior revealed that the highest current density was presented by the MBC (39.2 mA/cm² ) for a separation of 1/8”, followed by the BC (17.45 mA/cm² ) for the same separation. To select the best arrangement, the premature wear of the anode was also considered. In this instance the BC did not present carbon detachment, so it was selected to carry out the degradation of 17-α-ethinyl estradiol. The degradation efficiency was 74% in 2 h. The identification of by-products by gas chromatography coupled to mass spectrometry revealed the majority presence of carboxylic acids. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
4. Dynamic analysis and comparison of control techniques in the process of obtaining bioethanol.
- Author
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Muñoz Ñungo, Oneida, Muñoz Hernández, José Aldemar, and Hernández Sarabia, Héctor Mauricio
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ETHANOL as fuel , *STABILITY of nonlinear systems , *MATHEMATICAL optimization , *ETHANOL , *PRODUCTION control , *DYNAMICAL systems , *FERMENTATION , *MATHEMATICAL models - Abstract
Introduction-- Previous reactor models have been used to study the dynamic behavior of bioethanol production systems, however, few have elaborated a comparative study of control strategies that stabilize and control the variables of interest. Objective-- The objective of this study is to analyze the stability of a fermentation system to obtain bioethanol, its dynamic behavior, the characterization of equilibrium points and bifurcation points of the mathematical model proposed by Jarzebski in 1992 for a continuous fermentation, taking into account the performance of the reaction in a bioreactor and the application of industrial control techniques for its optimization. Methodology-- Review and design methods of quantitative and systematized type were used. Results-- The comparison between two control strategies to control bioethanol production, PID control and Fuzzy. Conclusions-- This work shows the importance of the stability analysis of a continuous system and how it can define the regions of operational interest, in this case for ethanol production, showing that productivity is inversely proportional to the dilution rate. Finally, it is concluded that a better dynamic behavior of the system is obtained when a Fuzzy controller is used. This work also shows the importance of the stability analysis of a continuous system and how it can define the regions of operational interest, in this case for the production of ethanol. [ABSTRACT FROM AUTHOR]
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- 2022
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5. Analytical Model Implementing Objectives in EVM for Advanced Project Control.
- Author
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Muñoz-Hernández, José Ignacio, Otegi-Olaso, José Ramón, and Rubio-Gómez, Julen
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- 2015
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6. Performance of individual antioxidants and their blend during repeated frying of tortilla chips.
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García‐Pérez, Andrea, Muñoz-Hernández, José Enrique, Guzmán‐Corona, Claudia, Cerón‐García, Abel, Ozuna, César, and Sosa‐Morales, María Elena
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TORTILLA chips , *DEEP frying , *FREE fatty acids , *BUTYLATED hydroxytoluene , *PLANT capacity , *CHEMICAL plants , *FRYING - Abstract
The performance of palm olein (PO) with different antioxidants during the repeated frying of tortilla chips was analyzed. Butylated hydroxytoluene (BHT) at concentration of 200 mg/kg (primary synthetic antioxidant), ascorbyl palmitate (AP) at 100 mg/kg (secondary synthetic antioxidant), and their blend (in the same concentration than individual addition) were added. Dough included 2% sesame seed, as it is prepared in commercial formulations for tortilla chips in the Guanajuato region (Mexico). Dough was sheeted, cut, and baked. Batches of 0.08 kg of tortillas were deep fat fried at 190°C for 2 min to produce the chips. Chemical indices—such as peroxide value (PV) and free fatty acids (FFA)—color and viscosity of the POs were evaluated. After 20 batches, the values for PO + BHT were PV = 29.6 meq/kg, FFA = 0.19%; PO + AP had PV = 13.3 meq/kg and FFA = 0.27%; and PO + BHT+AP, PV = 11.81 meq/kg and FFA = 0.29%. The best performance—based on lower primary oxidation—was achieved with the blend of antioxidants. Practical applications: Repeated frying with PO is a common operation for production of tortilla chips. The blend of primary (BHT) and secondary (AP) antioxidants at 200 and 100 mg/kg, respectively, is recommended for manufacturers of frying media and for food industry, since it improved the performance (lower primary oxidation) of PO. In this way, safer fried tortilla chips would be offer to consumers, avoiding risks for consumers' health (lower peroxide content) and having a product with good quality. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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7. Looking for Net Zero Districts: The case of Port District of Seville
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Filgueira Ciriza, Ander and Muñoz Hernández, José Ignacio
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net zero district ,renewable energy sources ,energy ,economic analysis - Abstract
[EN]Current climate situation, together with the politics driven by the European Union have inspired the development of Net Zero Districts. This document presents an alternative and economic analysis of a hybrid (PV/Wind turbine) power system projects. The case study is located at the Port District Area in the city of Seville, Spain. The analysis is carried out by investigating the potentials of wind and solar energy and collecting data from different sources. Hybrid Optimization Model for Electric Renewable (HOMER) software is used to analyse the available data and the technical-economic feasibility of the proposed hybrid power system. In this document, both off-grid and grid-connected systems are modelled and optimized for comparison purposes. The simulation results indicate that the proposed model of a grid-connected system is more feasible than the off-grid one in the mentioned region. [ES]La situación climática que se está viviendo actualmente, junto con las políticas energéticas impulsadas por la Unión Europea, han inspirado el desarrollo de los distritos Net Zero. Este documento presenta un estudio de alternativas y análisis económico de proyectos de sistemas de generación eléctrica híbrida (solar y eólica). El caso práctico está situado en el distrito portuario de la ciudad de Sevilla, España. El análisis se desarrolla mediante la investigación de los potenciales eólico y solar, junto con la recolección de datos de diferentes fuentes. El software utilizado para el análisis de los datos y la viabilidad técnico-económica del proyecto será HOMER. En este documento se trabaja en un modelo para un sistema aislado y otro conectado a red, con el objetivo de comparar la viabilidad de ambos. Los resultados del proyecto muestran que, para la localización prevista, un sistema conectado a red obtiene mejores resultados en cuanto a viabilidad del proyecto. [EU]Gaur egun bizi dugun egoera klimatikoak, Europar Batasunak bultzatutako politika energetikoekin batera, Net Zero distrituen garapena ekarri du. Dokumentu honek sistema hibridoen (eguzki energia eta energia eolikoa integratzen dituena) alternatiba azterketa eta analisi ekonomikoa aurkezten du. Kasu praktikoa Sevilla hiriko (Espainia) portu-distrituan kokatzen da. Analisia egiteko, haize- eta eguzki-potentzialak ikertu dira, eta hainbat iturritako datuak bildu. Proiektuaren bideragarritasun tekniko-ekonomikoa eta datuak aztertzeko erabiliko den softwarea HOMER izango da. Dokumentu honetan, sistema isolatu baterako eta sarera konektatuta dagoen beste baterako eredu bat lantzen da, bien bideragarritasuna alderatzeko. Proiektuaren emaitzek erakusten dutenez, aurreikusitako kokapenerako, sarera konektatutako sistema batek emaitza hobeak lortzen ditu proiektuaren bideragarritasunari dagokionez.
- Published
- 2023
8. Comparison of two pretreatments methods to produce second-generation bioethanol resulting from sugarcane bagasse.
- Author
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Bernier-Oviedo, Daniel José, Rincón-Moreno, John Anderson, Solanilla-Duqué, José Fernando, Muñoz-Hernández, José Aldemar, and Váquiro-Herrera, Henry Alexander
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ETHANOL as fuel , *BAGASSE , *LIGNOCELLULOSE , *HYDROLYSIS , *HEMICELLULOSE - Abstract
Non-centrifugal cane sugar (NCS) is a high carbohydrate-content food obtained by boil evaporation of the sugarcane juice. In the manufacturing process, the by-product of NCS called bagasse is used as foul for the boilers, underestimating its potential as a lignocellulosic source for second-generation bioethanol. In order to assess the bioethanol potential of the by-product resulting from the NCS production, pretreatments were applied to breakdown the lignocellulosic structure for the study in hand. Therefore, this study carried out a comparison of two pretreatment methods steam explosion (SE) and acid hydrolysis (AH) applied to the sugarcane bagasse to produce second-generation bioethanol. It was evidenced that both pretreatments redistribute lignin and hemicelluloses and enhances the accessible surface area of the biomass which further benefitted the subsequent fermentation process as the reducing sugars were available enough to foster the production of bioethanol. The study found that the SE pretreatment was likely to obtain more bioethanol as the reducing sugars (glucose) production outperformed other pretreatments under different residence times and concentrations. Considering the necessity to develop second-generation biofuel production, this study presented the sugarcane bagasse as a promising and abundance lignocellulosic substrate to be investigated more in depth in the Colombian context. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
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