A method for flash calculations in reactive mixtures

This paper introduces an alternative method for performing flash calculations in reacting systems, which has been developed using the theory of variable transformation of Ung and Doherty (1995). We use a simultaneous equation solving approach to perform two phase equilibrium calculations in chemically reactive systems. Thenumerical performance of proposed method is tested using several cases of study and our results show that it is efficient and generally can converge to the equilibrium compositions

Aislamiento de capsaicinoides directamente del fruto de capsicum

Se presenta una metodología experimental a nivel laboratoriopara optimizar la extracción de capsaicinoides directamente del fruto de capsicum. La herramienta experimental y el tipo de pruebas realizadas permiten su escalamiento a nivel piloto, además de que muestran en orden de magnitud el impacto de las variables sobre la recuperación de capsaicinoides. Se utilizó una técnica por cromatografía de líquidos para determinar la cantidad de capsaicinoides extraídos en las diferentes pruebasrealizadas. Posteriormente, para la mezcla solvente-capsaicinoides definida como óptima en la etapa de extraccióndel fruto de chile, se determinan condiciones depurificación a nivel piloto mediante una columna de platososcilantes tipo Karr basados en el trabajo desarrollado por Tapia y col. (1993). El proceso de purificación permitió eliminar el 40 % de las impurezas presentes, a un bajo costo respecto a los métodos utilizados actualmente

La enseñanza en el máster de abogacía a través del análisis de casos reales de carácter multidisciplinar. Aprendizaje "a partir del estudio de razonamientos parciales temáticos"

Generar blog para publicaciones de alumnos del Máster Abogacía, con "entradas" dirigidas. Habría análisis desde varias disciplinas añadiéndose estudios con enfoque basado en otras áreas de conocimiento, generando interdisciplinariedad

Analysis of Terpolymerization Systems for the Development of Carbon Fiber Precursors of PAN

The thermal stabilization of polyacrylonitrile fibers (FPAN) is one of the most important steps in the production of carbon fibers (CFs). In this paper, new precursor polymers from PAN have been synthesized with different chemical characteristics using a solution polymerization, and FPAN was obtained using an unconventional wet spinning system in the drying and collapsing steps. The effect of different operation conditions, comonomers, and termonomers on the properties of precursor polymers, polymerization reactions, mechanical properties, structural characteristics, and stabilization of the FPAN was studied and analyzed. FTIR and optical microscopy were used to analyze structural changes of FPAN in the thermal stabilization. The impact of the chemical composition of the precursor polymers on the physicochemical characteristics of FPAN and their behavior in the thermal stabilization process were evaluated. In particular, itaconic acid termonomer improved the tensile strength of the fibers from 8.07 to 16.87 cN/dtex, and the extent stabilization increased from 1.81 to 4.6. FTIR indicated that the reaction of stabilization of the terpolymer developed was initiated at a lower temperature compared to that of a commercial precursor polymer

Recycling of Tetra pak wastes via pyrolysis: Characterization of solid products and application of the resulting char in the adsorption of mercury from water

This paper provides a detailed analysis of the recycling of Tetra Pak waste via pyrolysis to recover the most valuable solid products within its composition, char and aluminum, and the subsequent application of the char in the adsorption of mercury in aqueous solutions. The impact of the Tetra Pak pyrolysis conditions on the char and aluminum yields and their associated properties have been analyzed using a variety of physico-chemical techniques. Tetra Pak-derived chars showed outstanding mercury adsorption properties (up to 215.7 mg/g) that can be attributed to the heterogeneous surface chemistry composed mainly by oxygenated functional groups associated to C, Ca, Al and Si. Tetra Pak pyrolysis allowed an effective recovery of aluminum at pyrolysis temperatures of 600 and 800 °C. Higher temperatures, up to 1000 °C, promote its oxidation to aluminum oxide and hydroxide. These findings contribute to increase the versatility in the Tetra Pak reuse to develop new adsorbents with promising performance for water treatment and the associated recovery of aluminum for further industrial applications.This work was supported by Junta de Extremadura and Fondo Europeo para el Desarrollo Regional (GRU18035). JSA would like to acknowledge financial support from MINECO (projects MAT2016-80285-p & PID2019-108453GB-C21)

Chitosan-G-Glycidyl Methacrylate/Au Nanocomposites Promote Accelerated Skin Wound Healing

Herein, we report the synthesis of Au nanoparticles (AuNPs) in chitosan (CTS) solution by chemically reducing HAuCl4. CTS was further functionalized with glycidyl methacrylate (chitosan-g-glycidyl methacrylate/AuNP, CTS-g-GMA/AuNP) to improve the mechanical properties for cellular regeneration requirements of CTS-g-GMA/AuNP. Our nanocomposites promote excellent cellular viability and have a positive effect on cytokine regulation in the inflammatory and anti-inflammatory response of skin cells. After 40 days of nanocomposite exposure to a skin wound, we showed that our films have a greater skin wound healing capacity than a commercial film (TheraForm®), and the presence of the collagen allows better cosmetic ave aspects in skin regeneration in comparison with a nanocomposite with an absence of this protein. Electrical percolation phenomena in such nanocomposites were used as guiding tools for the best nanocomposite performance. Our results suggest that chitosan-based Au nanocomposites show great potential for skin wound repair