85223-10-5Relevant articles and documents
HIGHLY EFFICIENT METHOD FOR PRODUCING SATURATED HOMOETHER FROM UNSATURATED CARBONYL COMPOUND
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Paragraph 0049; 0051-0052, (2020/07/16)
PROBLEM TO BE SOLVED: To provide a method for efficiently producing a saturated homoether from an unsaturated carbonyl compound. SOLUTION: The method for producing an unsaturated homoether uses an unsaturated carbonyl compound and hydrogen as a raw material, uses a catalyst comprising a metal supported on an acidic catalyst carrier and performs at least once a pressure reduction operation so that a differential pressure from a reaction pressure is 0.01 MPa or more. In the method, the metal of the catalyst is, for example, palladium and the carrier of the catalyst is alumina, silica, silica-alumina or the like. The unsaturated carbonyl compound serving as a raw material is 2-butenal, 2-ethyl-2-hexenal, 2-ethyl-2-butenal, 2-hexenal or the like and the produced saturated homoether is dibutyl ether, bis(2-ethylhexyl)ether, bis(2-ethylbutyl)ether, dihexyl ether or the like. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT
Copper promoter effect on acid-base and redox sites of Fe/Al2O3 catalysts and their role in ethanol-acetone mixture conversion
Pinheiro, Antonio Narcisio,Dos Santos, Regina Claudia Rodrigues,Ferreira Dos Santos, Sarah Brenda,Da Silva Júnior, Moacir José,Pinheiro Braga, Tiago,Freire, Valder Nogueira,Valentini, Antoninho
, p. 443 - 458 (2018/02/07)
Active species of copper and iron oxide (Cu-Fe) catalysts supported on alumina were prepared by combining Pechini and wet impregnation methods. The effect of combined acid-base and redox sites of Cu and Fe species on gas-phase ethanol-acetone mixture conversion was investigated. The catalysts were characterized by chemical analyses, XRD, H2-TPR, M?ssbauer spectroscopy, N2 physisorption, CO2-TPD, SEM-EDS, TG/DTA and pyridine adsorption isotherms. N2 adsorption/desorption isotherms and SEM-EDS analysis showed that the addition of copper caused an increase of BET surface area and Cu and Fe oxide dispersion. H2-TPR characterization showed that interactions between Cu and Fe oxides shift the reducibility of Fe3+ species to lower temperature improving the redox properties of the catalyst. The partial reduction of the Cu and Fe oxide species was found to be efficient in inhibiting the side decomposition reactions, improving the catalytic efficiency towards dehydrogenation and hydrogen transfer processes. It was found that acid-base pairs play an important role in the formation of dehydrogenation, dehydration and condensation products from ethanol, while redox sites are decisive for hydrogen transfer reactions with reduction of acetone to isopropanol. H2-TPR and M?ssbauer spectroscopy results for the spent catalysts revealed that the highest catalytic performance of the Cu-FeAl catalysts may be attributed to the good dispersion of the Cu oxide and the site generated by the partial reduction which produces Cu+/Cu0 and Fe2+ active species. A reaction pathway with the participation of the acid-base and redox sites in the formation of products by consecutive dehydrogenation-condensation or dehydrogenation-hydrogenation reactions has been proposed.
Preparation method of key intermediate 2-ethyl butyraldehyde of 2-ethyl butyric acid
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Paragraph 0011-0012, (2017/07/19)
The invention provides a preparation method of a key intermediate, 2-ethyl butyraldehyde, of 2-ethyl butyric acid, wherein the preparation method includes the steps of: adding an ethyl magnesium halide Grignard reagent to a protected alpha-halogenated aldehyde (I) solution, and performing a stirring reaction for 1-10 h at a certain temperature; performing post-treatment and de-protecting the product to obtain the 2-ethyl butyraldehyde. A route in the process in represented as follows. The method has short route and high usage ratio, is low in cost and easy to industrialize, and avoids defects in conventional methods.
