Advanced search


Knowledge area




4 results, page 1 of 1

Yield and Selectivity Improvement in the Synthesis of Carbonated Linseed Oil by Catalytic Conversion of Carbon Dioxide

DAVID ALEJANDRO GONZALEZ MARTINEZ SUSANA HERNANDEZ LOPEZ ENRIQUE VIGUERAS SANTIAGO (2021)

Artículo derivado de trabajo de tesis de doctorado

Carbonation of epoxidized linseed oil (CELO) containing five‐membered cyclic carbonate (CC5) groups has been optimized to 95% by reacting epoxidized linseed oil (ELO) with carbon dioxide (CO2) and tetrabutylammonium bromide (TBAB) as catalysts. The effect of reaction variables (temperature, CO2 pressure, and catalyst concentration) on the reaction parameters (conversion, carbonation and selectivity) in an autoclave system was investigated. The reactions were monitored, and the products were characterized by Fourier Transform Infrared Spectroscopy (FT‐IR), carbon‐13 nuclear magnetic resonance (13C‐NMR) and proton nuclear magnetic resonance (1H‐NMR) spectroscopies. The results showed that when carrying out the reaction at high temperature (from 90 °C to 120 °C) and CO2 pressure (60–120 psi), the reaction’s conversion improves; however, the selectivity of the reaction decreases due to the promotion of side reactions. Regarding the catalyst, increasing the TBAB concentration from 2.0 to 5.0 w/w% favors selectivity. The presence of a secondary mechanism is based on the formation of a carboxylate ion, which was formed due to the interaction of CO2 with the catalyst and was demonstrated through 13C‐NMR and FT‐IR. The combination of these factors makes it possible to obtain the largest conversion (96%), carbonation (95%), and selectivity (99%) values reported until now, which are obtained at low temperature (90 °C), low pressure (60 psi) and high catalyst concentration (5.0% TBAB).

Secretaría de Investigación y Estudios Avanzados 4965/2020CIB

Article

carbonated epoxidized linseed oil non‐isocyanate polyurethane 5 member cyclic carbonate BIOLOGÍA Y QUÍMICA

Early estimation of the risk factors for hospitalization and mortality by COVID-19 in Mexico.

María Fernanda Carrillo Vega GUILLERMO SALINAS ESCUDERO Luis Miguel Gutiérrez Robledo LORENA PARRA RODRIGUEZ (2020)

Due to a high prevalence of chronic non-degenerative diseases, it is suspected that COVID 19 poses a high risk of fatal complications for the Mexican population. The present study aims to estimate the risk factors for hospitalization and death in the Mexican population infected by SARS-CoV-2

Article

MEDICINA Y CIENCIAS DE LA SALUD Geriatrics Geriatría Covid-19 Envejecimiento Hospitalization Chronic non-degenerative diseases Enfermedades cronicas no degenerativas

An educational intervention to generate environmental behaviors in the family

Maria Elena De La Llata Lopez María Laura Sampedro Rosas Elizabeth Olmos Martínez Jose Luis Rosas Acevedo Ana Laura Juarez Lopez Ramon Bedolla Solano (2017)

The rational use of natural resources and the protection of the environment means acting with responsability and opportunity. To generate environmental behaviors in the family, its members must have environmental culture. Therefore, to reeducate parents in this parents in this field, the non formal environmental educational program of the training workshop Environmental culture for the family, was implemented in three schools

Article

Environmental culture non formal environmental education Family Society and environmental values CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO