Mostrando ítems 1-9 de 9

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Cacua Silva, Alejandra; Rodriguez Ordonez, Dora Cecilia; Parra LLanos, John Wilmer (Journal of Physics: Conference Series, 2018-12-07)

Rice husk (RH) is the main biomass byproduct of the rice industry, so much that it corresponds to 20% of the total cereal production and is generally considered a waste. Due to its content of cellulose and hemicellulose, ...
Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol

Cacua Silva, Alejandra; Rodriguez Ordonez, Dora Cecilia; Parra LLanos, John Wilmer (Journal of Physics: Conference SeriesLondres, Reino Unido, 2019-11-19)

Several companies generate large amounts of agroindustrial waste, which could be used as raw material for the production of bioethanol; among them, those that process and commercialize rice, which produce a large amount ...
Mathematical model for production sequencing in a manufacturing company

Parra LLanos, John Wilmer; Caicedo-Rolón, Alvaro Jr; Rivera Cadavid, Leonardo (Journal of Physics: Conference SeriesLondres, Reino Unido, 2019-11-19)

The objective of the research was to determine the optimal sequence of production of n jobs in m operations, in a small footwear manufacturing company with characteristics of a flow shop machine environment, which minimizes ...
Analysis of folic acid in white rice by ultra-fast liquid chromatography

Rodriguez Ordonez, Dora Cecilia; Torres Herrera, Laura Natalia; Parra LLanos, John Wilmer (Journal of Physics: Conference SeriesLondres, Reino Unido, 2019-11-19)

The method of analysis was standardized, and the folic acid content was determined in samples of fortified white rice (Z, G and D) and unfortified (E and O). The analysis was performed in triplicate in samples of 2.0000 ...
OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

RodrÍguez Ordoñez, Dora Cecilia; Parra LLanos, John Wilmer; López Domínguez, Manuel José (Universidad Francisco de Paula SantanderCúcuta, Norte de Santander, 2020-02-02)

El papel, al igual que otros derivados de la pasta de celulosa, como el cartón, son materiales con una infinidad de usos. Con el desarrollo de la tecnología y el uso de los computadores se pensaba que el papel desaparecería, ...
Phenomenological modeling and simulation of a textile stenter

Parra LLanos, John Wilmer; Santos, Rossane; Bastos Quadri, Marintho; Martins, Ianto Oliveira (Textile Research JournalWashintong D.C , Estados Unidos, 2020-04-28)

Mathematical modeling and simulation of cotton fabric drying in a stenter machine was performed using a finite element method. A standard κ-ɛ turbulence model was coupled with heat/mass transfer in porous media models. A ...
Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography

RodrÍguez Ordoñez, Dora Cecilia; Medina Mojica, Ingrid Yurley; Parra LLanos, John Wilmer (Journal of Physics: Conference Series, 2020-08-05)

The objective of this work was to standardize the method of analysis of caffeine and determine its content in three energy drinks (Vive 100, Peak and Red Bull) consumed in the Colombian market, which were selected based ...
Production sequencing in a flow shop system using optimization and heuristic algorithms

Caicedo-Rolón, Alvaro Jr; Parra LLanos, John Wilmer (Gestao e ProducaoBrasilia,Brasil, 2021-03-31)

The purpose of the research was to determine the sequencing of the production of n jobs in m operations in a small footwear company in an environment of flow shop machine characteristics, which optimizes the total time ...
Fluid-dynamic study of the behavior of the air inside a textile Stenter

Parra, J W; Quadri, M B; Rodríguez, D C (Journal of Physics: Conference Series, 2021-09-03)

In the textile industry, drying is one of the most important processes. This process requires large investments and high energy consumption, which generates high costs for companies in this sector. In this work, a modeling ...

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Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale
...
Cacua Silva, Alejandra | 2018-12-07

Rice husk (RH) is the main biomass byproduct of the rice industry, so much that it corresponds to 20% of the total cereal production and is generally considered a waste. Due to its content of cellulose and hemicellulose, the RH has a great potential for its alternative use in the production of bioethanol, since it has a great advantage with respect to the conventional raw materials used (sugar cane, corn, beet and sweet sorghum, among others), given that this lignocellulosic material is abundant and does not compete with the food industry. The objective of this work was to obtain bioethanol from rice husk at a pilot scale, taking advantage of its cellulose and hemicellulose content. For this, a sample of 450g of RH was taken, which was pretreated with a 2.00% w/v NaOH solution and subsequently hydrolyzed with acid cellulase (CFB3S). The alcoholic fermentation of total reducing sugars (TRS) obtained in the enzymatic hydrolysis was carried out with Saccharomyces cerevisiae, finally, the fractional distillation of the must was carried out, by means of which four bioethanol samples were obtained with concentrations of 71.3% v/v, 30.0% v/v, 10.3% v/v, and 5.3% v/v of alcohol, which when mixed produced a sample of 95mL of solution with a concentration of 27% v/v alcohol (4.70g/100g of RH).

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Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol
...
Cacua Silva, Alejandra | 2019-11-19

Several companies generate large amounts of agroindustrial waste, which could be used as raw material for the production of bioethanol; among them, those that process and commercialize rice, which produce a large amount of husk, a lignocellulosic material, as a by-product. These companies generally use rice husk as fuel for the ovens, generating problems to the environment due to the emission of polluting smoke. The objective of this work was to obtain bioethanol from rice husk, taking advantage of its cellulose and hemicellulose content. The lignin was removed by an alkaline pretreatment with 2.00% w/v sodium hidroxide solution. Cellulose and hemicellulose in the husk were hydrolysed by enzymatic hydrolysis with acid cellulase for 72 hours. During this period of time, the concentration of total reducing sugars was monitored by the 3,5-dinitrosalicylic acid method, in order to determine the reaction time in which the highest concentration of total reducing sugars is obtained. The sugars obtained were fermented with saccharomyces cerevisiae, for the production of alcohol. During the enzymatic hydrolysis of the pre-treated rice husk, it was found that the highest concentration of total reducing sugars in the samples was 7.778 g/L, obtained in a time of 24 hours of hydrolysis. The sugars obtained were fermented with Saccharomyces cerevisiae, for alcohol production. A distillate was obtained with a concentration of 3.7% v/v.

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Mathematical model for production sequencing in a manufacturing company
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Parra LLanos, John Wilmer | 2019-11-19

The objective of the research was to determine the optimal sequence of production of n jobs in m operations, in a small footwear manufacturing company with characteristics of a flow shop machine environment, which minimizes the total time of completion of jobs in the production system, makespan. A mathematical model of integer linear programming was designed, coded and solved by means of the JuliaPro software. It shows the production sequence that does not consider permutation, and minimizes makespan with 3807 minutes. The mathematical model of optimization is presented as a flexible and valuable tool for operational decision making, which could be replicated in other manufacturing companies, impacting on the improvement of costs and delivery times.

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Analysis of folic acid in white rice by ultra-fast liquid chromatography
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Rodriguez Ordonez, Dora Cecilia | 2019-11-19

The method of analysis was standardized, and the folic acid content was determined in samples of fortified white rice (Z, G and D) and unfortified (E and O). The analysis was performed in triplicate in samples of 2.0000 g, hydrolysis was performed with phosphate buffer pH 8.82 for one hour and then lowered to pH 7.00 for enzymatic treatment with takadiastase at 65°C. The extracts were filtered by gravity, purified with nylon syringe filters and ion exchange cartridges (solid phase extraction using strong anion exchange cartridges). The concentration in mg folic acid/kg of rice, in each extract was determined by ultrafast liquid chromatography, with average values for Lot1 of the fortified rice samples, of 44.03, 51.95, 38.08, and unfortified samples of 31.51 and 21.94, and with respect to Lot2 of 41.26, 41.27, 34.54 for fortified ones and 24.92 and 20.94 for non-fortified ones, respectively. The concentration of folic acid obtained by filtration through syringe filters was higher than in the extracts purified by solid phase extraction using strong anion exchange cartridges, evidencing loss of the analyte. The recovery of folic acid in the samples doped and purified by syringe filters was around 65.00%, while by solid phase extraction using strong anion exchange cartridges 43.00%. There is evidence of variation in the folic acid content between different batches of rice of the same brand.

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OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.
...
RodrÍguez Ordoñez, Dora Cecilia | 2020-02-02

El papel, al igual que otros derivados de la pasta de celulosa, como el cartón, son materiales con una infinidad de usos. Con el desarrollo de la tecnología y el uso de los computadores se pensaba que el papel desaparecería, sin embargo, hoy en día, la fabricación papel y las bobinas de celulosa para otras aplicaciones, se ha mantenido, incluso ha aumentado, siendo un material raramente sustituible por otro. La pasta de celulosa proviene principalmente del tronco de los árboles, lo que tiene una trascendencia fundamental en la sociedad, ya que son millones de árboles los necesarios día a día para la obtención de papel y otros productos relacionados. El uso de materiales lignocelulósicos de desecho, entre ellos, las hojas de palma de aceite (HPA), para la obtención de pasta de celulosa, se presenta como una buena alternativa para sustituir las materias primas convencionales, siendo una opción amigable con el ambiente (Vargas et al., 2013; Ferrer, 2013). Según los datos del Censo Nacional de plantaciones en Colombia, existen más de 140.000 hectáreas cultivadas de palma africana, con la poda que se les realiza a estas palmas, se estima que se obtienen 924.000 toneladas de hojas al año, que en su mayoría se convierten en material de desecho, que pueden llegar a ser la materia prima suficiente para obtener 140.000 toneladas por año de pasta de celulosa para producir papel (Angarita et al., 2009). El cultivo de la palma de aceite y el procesamiento de su fruto es de gran importancia para el departamento Norte de Santander, pues es una de las industrias de la región que más ha generado transformación y desarrollo durante los últimos años en el sector agrícola. Con el desarrollo de este proyecto, se plantea una posible solución a los palmicultores del Catatumbo, al disponer y usar las grandes cantidades de HPA generadas por esta agroindustria como materia prima para obtener pasta de celulosa, dando un valor agregado a este residuo. Por otra parte, también se propone la HPA como una fuente de obtención de celulosa diferente a las materias primas convencionales (los árboles), que ocasiona la deforestación de los bosques, cuando su uso no se hace de manera controlada. Inicialmente se hará una caracterización de la hoja obtenida en la poda y mediante un estudio de las variables de operación del método Kraft, se determinarán las condiciones con las cuales se podrá obtener un mayor rendimiento de pasta de celulosa cruda a partir de las HPA. Obtenida la pasta cruda se hará una caracterización de ésta, para proponer posibles aplicaciones. Con la ejecución de este proyecto se fortalecerán las líneas de investigación “Aprovechamiento industrial de la biomasa vegetal o subproductos de la industria” y “Tecnologías ambientalmente sostenibles” del Grupo de Investigación en Química Básica Aplicada (GIQUIBA).

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Phenomenological modeling and simulation of a textile stenter
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Parra LLanos, John Wilmer | 2020-04-28

Mathematical modeling and simulation of cotton fabric drying in a stenter machine was performed using a finite element method. A standard κ-ɛ turbulence model was coupled with heat/mass transfer in porous media models. A novel approach to simulate all injectors enabled a new perspective of the process and the calculation of local convective coefficients. Three simulations were run: Simulation I reproduced real operational conditions; Simulations II and III estimated the effects of increasing drying air inlet velocity and decreasing translational velocity of the fabric, respectively. The highest drying air velocities occurred at the nozzles on the edges of the injectors, leading to high convective heat and mass transfer coefficients. Results indicated the drying process was not uniform along the fabric’s width. The models were acceptable in realistically predicting the drying of a cotton fabric in a stenter machine and could be useful in optimizing the stenter design considering the final product’s quality and energy consumption.

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Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography
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RodrÍguez Ordoñez, Dora Cecilia | 2020-08-05

The objective of this work was to standardize the method of analysis of caffeine and determine its content in three energy drinks (Vive 100, Peak and Red Bull) consumed in the Colombian market, which were selected based on the results of a significant survey conducted to 384 people in the metropolitan area of "San José de Cúcuta, Colombia", from each energy drink two production lots were taken and in turn from each lot three drinks were taken for a total of 18, each one was analyzed in triplicate; caffeine concentration was determined on a Shimadzu Prominence ultra-fast liquid chromatograph. The average concentrations in mg of caffeine/L, for lot 1 were 256.96, 218.10 and 235.73 for drinks Vive 100, Peak and Red Bull, respectively and for lot 2, the respective values were 229.30, 233.86 and 238.33. As established in Resolution 4150 of 2009, the maximum limit allowed is 320 mg of caffeine/L, it was observed that the concentrations in all the energy drinks analyzed are lower, therefore, they are complying with the provisions of the law.

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Production sequencing in a flow shop system using optimization and heuristic algorithms
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Caicedo-Rolón, Alvaro Jr | 2021-03-31

The purpose of the research was to determine the sequencing of the production of n jobs in m operations in a small footwear company in an environment of flow shop machine characteristics, which optimizes the total time of completion of the job in the production system (Makespan). We used heuristic algorithms that were applied through Lekin and WinQSB softwares, and for the optimization algorithm we designed a mathematical model that was solved by Juliabox software. Results show that the integer linear programming and local search minimize the makespan with 3807 minutes, and different production sequences for each algorithm, which consider permutation, which improves the traditional way of programming the production in 97 minutes, however, the optimization presents better results in the performance measures of average waiting time, average time of flow, and average job in process. Application of heuristic algorithms proves to be simple and fast, but the mathematical model of optimization designed and encoded in the software is a flexible and valuable tool for decision making in production programming, which could be applied in other footwear companies, and in other productive sectors whose companies have the same characteristics of the case study, reducing costs and improving delivery times.

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Fluid-dynamic study of the behavior of the air inside a textile Stenter
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Parra, J W | 2021-09-03

In the textile industry, drying is one of the most important processes. This process requires large investments and high energy consumption, which generates high costs for companies in this sector. In this work, a modeling of the behavior of the air was carried out in a textile Stenter, under real operating conditions through the development of fluid-dynamic simulations. For the computational modeling of the problem, a 3D geometry was constructed based on measurements taken from an injector of a textile Stenter. The standard k-ε turbulence model was used in the turbulent flow solution. The equations of the model were solved numerically using the finite element method. The standard k-epsilon turbulence model proved to be a model capable of reproducing the behavior of the air in the injectors of the textile Stenter.

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Listar Química Básica Aplicada – GIQUIBA por fecha de publicación

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol

Mathematical model for production sequencing in a manufacturing company

Analysis of folic acid in white rice by ultra-fast liquid chromatography

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography

Production sequencing in a flow shop system using optimization and heuristic algorithms

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Envíos recientes

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol

Mathematical model for production sequencing in a manufacturing company

Analysis of folic acid in white rice by ultra-fast liquid chromatography

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography

Production sequencing in a flow shop system using optimization and heuristic algorithms

Fluid-dynamic study of the behavior of the air inside a textile Stenter

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Listar Química Básica Aplicada – GIQUIBA por fecha de publicación

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale ﻿

Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol ﻿

Mathematical model for production sequencing in a manufacturing company ﻿

Analysis of folic acid in white rice by ultra-fast liquid chromatography ﻿

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO. ﻿

Phenomenological modeling and simulation of a textile stenter ﻿

Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography ﻿

Production sequencing in a flow shop system using optimization and heuristic algorithms ﻿

Fluid-dynamic study of the behavior of the air inside a textile Stenter ﻿

Envíos recientes

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol

Mathematical model for production sequencing in a manufacturing company

Analysis of folic acid in white rice by ultra-fast liquid chromatography

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography

Production sequencing in a flow shop system using optimization and heuristic algorithms

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Portales Institucionales

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Alkaline pre-treatment and hydrolysis with acid cellulase of the rice husk (Oryza sativa) for production of bioethanol

Mathematical model for production sequencing in a manufacturing company

Analysis of folic acid in white rice by ultra-fast liquid chromatography

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Analysis of caffeine in energy drinks by Ultra-Fast Liquid Chromatography

Production sequencing in a flow shop system using optimization and heuristic algorithms

Fluid-dynamic study of the behavior of the air inside a textile Stenter