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Featured researches published by David A. Echeverri.


Información tecnológica | 2015

Síntesis y Caracterización de Catalizadores tipo Hidrotalcita Dopados con Fe³+ para la Producción de Monoglicéridos y Diglicéridos de Aceite de Soya

William Pérez; David A. Echeverri; Luis A. Rios

Resumen En este trabajo se sintetizaron hidrotalcitas sustituidas con Fe +3 con diferentes porcentajes de hierro. Los compuestos fueron calcinados y empleados en la produccion de monogliceridos y digliceridos a 230oC y usando una relacion molar 1:5 de aceite de soya/glicerol. Los catalizadores fueron caracterizados por difraccion de rayos-X (XRD), fluorescencia de rayos-X (XRF), analisis gravimetrico (TGA) y desorcion con temperatura programada (TPD). El rendimiento de los productos fue determinado mediante cromatografia de gases con detecto de ionizacion de llama (CG-FID). Adicionalmente, se evaluo la misma reaccion utilizando hidrotalcitas sin sustituir. La caracterizacion de los catalizadores revelo diferencias estructurales y quimicas entre las hidrotalcitas sustituidas y sin sustituir. Los compuestos sustituidos con Fe 3+ presentaron mejores rendimientos en la produccion de gliceridos que los no sustituidos pero menor selectividad hacia los monogliceridos.


Información tecnológica | 2010

Hidrogenación de Metil Oleato con Catalizadores de Ru-Sn/Al2O3: Método Sol-gel vs. Impregnación

David A. Echeverri; Luis A. Rios; Juan Marín

In this work, the effect of the preparation method (sol-gel vs. impregnation) over conversion and selectivity to oleyl alcohol in the hydrogenation of methyl oleate over Ru-Sn/Al2O3 catalysts at 270oC and 5 MPa was evaluated. The catalysts were characterized by SEM-EDS, TPR, XRD and surface area by nitrogen adsorption. The sol-gel method produced high dispersion of metals in the support, however catalysts prepared by sol-gel method were less reducible. For both methods an optimum Sn/Ru atomic ratio that allowed higher percentage of unsaturated alcohol was found. For the impregnation method this atomic ratio was 2 and for sol-gel method was 1. However, higher conversions and higher selectivity toward the oleyl alcohol were obtained with the impregnation method, using the optimum atomic ratio,


Journal of the American Oil Chemists' Society | 2011

Glycerolysis of Soybean Oil with Crude Glycerol Containing Residual Alkaline Catalysts from Biodiesel Production

David A. Echeverri; Fernando Cardeño; Luis A. Rios


Applied Catalysis A-general | 2009

Characterization and carbonylic hydrogenation of methyl oleate over Ru-Sn/Al2O3: Effects of metal precursor and chlorine removal

David A. Echeverri; Juan Marín; Gloria M Restrepo; Luis A. Rios


Applied Catalysis A-general | 2011

Epoxidation of jatropha oil using heterogeneous catalysts suitable for the Prileschajew reaction: Acidic resins and immobilized lipase

Luis A. Rios; David A. Echeverri; Alexander Franco


European Polymer Journal | 2012

Synthesis of elastomeric networks from maleated soybean-oil glycerides by thiol-ene coupling

David A. Echeverri; V. Cádiz; J.C. Ronda; Luis A. Rios


Industrial Crops and Products | 2013

Synthesis of maleated-castor oil glycerides from biodiesel-derived crude glycerol

David A. Echeverri; William Pérez; Luis A. Rios


Industrial Crops and Products | 2013

Hydroxylation of vegetable oils using acidic resins as catalysts

Luis A. Rios; David A. Echeverri; Fernando Cardeño


European Polymer Journal | 2015

Synthesis and copolymerization of thermosetting resins obtained from vegetable oils and biodiesel-derived crude glycerol

David A. Echeverri; Luis A. Rios; Bernabé L. Rivas


Journal of the American Oil Chemists' Society | 2013

Glycerolysis of Crude Methyl Esters with Crude Glycerol from Biodiesel Production

David A. Echeverri; Fernando Cardeño; Luis A. Rios

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Luis A. Rios

University of Antioquia

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Juan Marín

University of Antioquia

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Paula Mazo

University of Antioquia

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