A gas chromatography (GC) method for the simultaneous determination of glycerol, methyl oleate, m... more A gas chromatography (GC) method for the simultaneous determination of glycerol, methyl oleate, monoglycerides (alpha- and beta-glyceryl monooleates), diglycerides (1,2- and 1,3-glyceryl dioleates), and triglycerides is postulated and validated to monitor the reaction product evolution during the catalytic synthesis of monoglycerides by glycerolysis of methyl oleate. The method is suitable for quantitative analysis of the multiphase reaction system, either under liquid or solid catalyzed conditions in a wide concentration range. Excellent separation of all the analytes was achieved with a 15 m-capillary column of 100% methyl polysiloxane in 35 minutes. A discussion on different solvents (toluene and n-hexane) and derivatization procedures is presented. A proper and unique combination of silylating agents for the trimethylsilylation of the free hydroxyl groups of glycerol, mono- and diglycerides is proposed as well as two internal standards, n-hexadecane and cholesterol. The method a...
ABSTRACT The liquid-phase synthesis of pseudoionones by aldol condensation of citral with acetone... more ABSTRACT The liquid-phase synthesis of pseudoionones by aldol condensation of citral with acetone was studied on MgO samples containing between 0.13 and 2.6 wt. % of Li+. The Li+ addition to MgO up to about 0.5 % increased the density of strong O2- basic sites, but increasing the Li+ amount further diminished the sample basicity. Formation of pseudoionones increased with the sample basicity: the higher the density of strong basic sites the higher the pseudoionone yields. Thus, Li-MgO samples containing the highest density of O2- sites were the most active catalysts for producing pseudoionones.
Introduction Glycerol is the main byproduct of biodiesel production. Nowadays, glycerol surplus i... more Introduction Glycerol is the main byproduct of biodiesel production. Nowadays, glycerol surplus is becoming a matter of environmental and economic concern. Therefore, new ideas to convert glycerol in more valuable compounds are needed. Monoglyceride (MG) synthesis by glycerol (Gly) transesterification with fatty acid methyl esters (FAME), Figure 1, is an attractive option to transform this biomass-derived compound into fine chemicals. MG ́s are used as surfactants in food, cosmetics and pharmaceuticals. Nowadays, this process is promoted by corrosive, nonrecyclable liquid mineral bases. Then, the use of a solid base catalyst would present several technological and environmental advantages. In this paper, the solid base-catalyzed transesterification of Gly with oleic acid methyl ester was studied on several basic oxides. The effect of the reaction temperature and Gly/FAME ratio on the MG yield was investigated as well as those of catalyst surface hydroxylation and basic properties.
–Conversion of lignocellulose-derived sugars in the biorefinery would result in the production of... more –Conversion of lignocellulose-derived sugars in the biorefinery would result in the production of second generation liquid biofuels. This process requires removal of almost all the oxygen atoms and other chemical steps to form branched hydrocarbons and to increase the molecular weight. The first step of the sugar transformation gives the so called “platform molecules” (C4-C6 oxygenates) which can be further transformed into C9-C18+ alkanes to be used as liquid transportation fuels. The gas-phase upgrading of 2-hexanol, a model molecule of the primary conversion of sugars, was investigated on Cu-MI-MII mixed oxides (MI, MII: Mg 2+ , Al 3+ , Ce 4+ ) to obtain higher molecular weight compounds of application as jet fuels (1). The bifunctional metal-base catalytic process occurs through a series of sequential steps comprising dehydrogenation, C-C coupling, dehydration and hydrogenation reactions. Nano-sized Cu 0 particles promote dehydrogenation and hydrogenation steps whereas acid-base...
Fil: Ferretti, Cristian Alejandro. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Ce... more Fil: Ferretti, Cristian Alejandro. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica ; Argentina
Fil: Diez, Veronica Karina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Ci... more Fil: Diez, Veronica Karina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera"; Argentina
A gas chromatography (GC) method for the simultaneous determination of glycerol, methyl oleate, m... more A gas chromatography (GC) method for the simultaneous determination of glycerol, methyl oleate, monoglycerides (alpha- and beta-glyceryl monooleates), diglycerides (1,2- and 1,3-glyceryl dioleates), and triglycerides is postulated and validated to monitor the reaction product evolution during the catalytic synthesis of monoglycerides by glycerolysis of methyl oleate. The method is suitable for quantitative analysis of the multiphase reaction system, either under liquid or solid catalyzed conditions in a wide concentration range. Excellent separation of all the analytes was achieved with a 15 m-capillary column of 100% methyl polysiloxane in 35 minutes. A discussion on different solvents (toluene and n-hexane) and derivatization procedures is presented. A proper and unique combination of silylating agents for the trimethylsilylation of the free hydroxyl groups of glycerol, mono- and diglycerides is proposed as well as two internal standards, n-hexadecane and cholesterol. The method a...
ABSTRACT The liquid-phase synthesis of pseudoionones by aldol condensation of citral with acetone... more ABSTRACT The liquid-phase synthesis of pseudoionones by aldol condensation of citral with acetone was studied on MgO samples containing between 0.13 and 2.6 wt. % of Li+. The Li+ addition to MgO up to about 0.5 % increased the density of strong O2- basic sites, but increasing the Li+ amount further diminished the sample basicity. Formation of pseudoionones increased with the sample basicity: the higher the density of strong basic sites the higher the pseudoionone yields. Thus, Li-MgO samples containing the highest density of O2- sites were the most active catalysts for producing pseudoionones.
Introduction Glycerol is the main byproduct of biodiesel production. Nowadays, glycerol surplus i... more Introduction Glycerol is the main byproduct of biodiesel production. Nowadays, glycerol surplus is becoming a matter of environmental and economic concern. Therefore, new ideas to convert glycerol in more valuable compounds are needed. Monoglyceride (MG) synthesis by glycerol (Gly) transesterification with fatty acid methyl esters (FAME), Figure 1, is an attractive option to transform this biomass-derived compound into fine chemicals. MG ́s are used as surfactants in food, cosmetics and pharmaceuticals. Nowadays, this process is promoted by corrosive, nonrecyclable liquid mineral bases. Then, the use of a solid base catalyst would present several technological and environmental advantages. In this paper, the solid base-catalyzed transesterification of Gly with oleic acid methyl ester was studied on several basic oxides. The effect of the reaction temperature and Gly/FAME ratio on the MG yield was investigated as well as those of catalyst surface hydroxylation and basic properties.
–Conversion of lignocellulose-derived sugars in the biorefinery would result in the production of... more –Conversion of lignocellulose-derived sugars in the biorefinery would result in the production of second generation liquid biofuels. This process requires removal of almost all the oxygen atoms and other chemical steps to form branched hydrocarbons and to increase the molecular weight. The first step of the sugar transformation gives the so called “platform molecules” (C4-C6 oxygenates) which can be further transformed into C9-C18+ alkanes to be used as liquid transportation fuels. The gas-phase upgrading of 2-hexanol, a model molecule of the primary conversion of sugars, was investigated on Cu-MI-MII mixed oxides (MI, MII: Mg 2+ , Al 3+ , Ce 4+ ) to obtain higher molecular weight compounds of application as jet fuels (1). The bifunctional metal-base catalytic process occurs through a series of sequential steps comprising dehydrogenation, C-C coupling, dehydration and hydrogenation reactions. Nano-sized Cu 0 particles promote dehydrogenation and hydrogenation steps whereas acid-base...
Fil: Ferretti, Cristian Alejandro. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Ce... more Fil: Ferretti, Cristian Alejandro. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica ; Argentina
Fil: Diez, Veronica Karina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Ci... more Fil: Diez, Veronica Karina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera"; Argentina
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