Hydrogenation Transfer
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. ADVANCED CONTROL OF A COMPLEX CHEMICAL PROCESS
Abstract Three phase catalytic hydrogenation reactors are important reactors with complex behavior due to the interaction among gas, solid and liquid phases with the kinetic, mass and heat transfer mechanisms. A nonlinear distributed parameter model was developed based on mass and energy conservation principles. It consists of balance equations for the gas a
Braz. J. Chem. Eng.. Publicado em: 2016-03
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2. Asymmetric transfer hydrogenation of ketones in aqueous solution catalyzed by rhodium(III) complexes with C2-symmetric fluorene-ligands containing chiral (1R,2R)-cyclohexane-1,2-diamine
Dois ligantes C2-simétricos bis(sulfonamide) contendo o fluoreno-quiral (1R,2R)-ciclohexano-1,2-diamina foram complexados com RhIII(Cp*) e usados como catalizador para redução aromática de cetonas. Os alcoois secundários correspondentes foram obtidos com ee 87-100% e rendimento de 85-99%, sob condições de transferência de hidrogenio assimétrica (THA
Journal of the Brazilian Chemical Society. Publicado em: 2010
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3. The asymmetric total synthesis of (+)- and (-)-trypargine via Noyori asymmetric transfer hydrogenation
Uma síntese total e eficiente da (+) e (-)-tripargina, alcalóide β-carbolínico isolado da pele da rã africana K. Senegalensis, foi realizada em 6 etapas e 38% de rendimento global, a partir da triptamina, tendo como base a construção do sistema β-carbolínico via reação de Bischler-Napieralski e a redução enantiosseletiva do intermediário diidro
Journal of the Brazilian Chemical Society. Publicado em: 2009
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4. Correlation between images and electrical signals for determination of bubble diameters in liquids / Correlação entre imagens e sinal elétrico para determinação do diâmetro de bolhas em líquidos
The distribution of bubble sizes is a critical feature in twophase systems. The interfacial area of bubbles is strongly related to chemical reaction and mass transfer rates in industrial applications such as distillation and fermentation columns, biological systems, oxidation, hydrogenation, waste water treatment and in natural processes such as aerosol dy
Publicado em: 2006
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5. Ligantes quirais nitrogenados em reações de hidrogenação catalitica assimetrica e redução enantiosseletiva com oxazaborolidinas / Nitrogen chiral ligants in asymmetric hydrogenation and enantioselective reduction using oxazaborolidine
O presente trabalho tem como objetivo a síntese e aplicação de novos aminoálcoois e ligantes quirais fosforados derivados desses e sua aplicação em catálise assimétrica. Com este intuito, foram sintetizados os aminoálcoois (2R)-2-[(2R) azolan-2-il]-2-feniletan-1-ol (4) e (2R)-2-[(2R) hexaidro-2-piridinil]-2-feniletan-1-ol (6) que são inéditos na l
Publicado em: 2005
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6. Modelagem e simulaçao do processo de hidrogenação de oleo de soja em um reator de recirculação (tipo loop). / Modelling and simulation of the hidrogenation soybean oil process in a recirculation reactor (type Loop).
This is a thesis on modeling and simulation of a loop reactor for hydrogenation of soybean oil. Considering the advantages offered by jet loop reactors and the modelling lack for oils hydrogenation, three models are proposed to describes it: the first is a batch reactor; the second is an association of a CSTR in series with PFR and the third is an associatio
Publicado em: 2004
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7. Modelagem deterministica de reatores de lama cataliticos trifasicos
The principal aim of this work was the development of a software capable to represent via deterministic modelling the dynamic behaviour of three-phase slurry catalytic reactors. Intending to achieve a realistic representation of the system, detailed models are utilized. They consist of mass and heat balance equations for the catalyst particles as well as for
Publicado em: 2003
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8. Enantioselective synthesis of aziridines using asymmetric transfer hydrogenation as a precursor for chiral derivatives used as bonding agent for rocket solid propellants
A rapid, expedient and enantioselective method for the synthesis of beta-hydroxy amines and monosubstituted aziridines in up to 99% e.e., via asymmetric transfer hydrogenation of a-amino ketones and cyclisation through treatment with tosyl chloride and base, is described. (1R,2R)-N-(para-toluenesulfonyl)-1,2-ethylenediamine with formic acid has been utilised
Química Nova. Publicado em: 2002-11
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9. Dynamicmodelling of catalytic three-phase reactors for hydrogenation and oxidation processes
The dynamic modelling principles for typical catalytic three-phase reactors, batch autoclaves and fixed (trickle) beds were described. The models consist of balance equations for the catalyst particles as well as for the bulk phases of gas and liquid. Rate equations, transport models and mass balances were coupled to generalized heterogeneous models which we
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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10. Reforma catalitica do n-octano visando a produção de aromaticos
Catalytic Refonning is a process of great interest to the petrochemical industry for the production of aromatic compounds that are raw material to the manufacture of plastics, elastomers and resins. The catalytic refonning reaction of n-octane was studied in a Berty type reactor with internal recycle aiming on the maximization of xylenes and ethylbenzene. A
Publicado em: 1997
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11. Projeto e desempenho de um reator de recirculação para hidrogenação
This is an experimental work for the development of a loop reactor for hydrogenation of vegetable oil. The reactor system has a cilindrical body, a diafragm pump for recirculation of the suspension catalystic, an heat exchanger for heating/cooling and a venturi ejector to mix the reacting components. This ejector maintains a continuous and uniform suspension
Publicado em: 1995
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12. Artificial metalloenzymes based on biotin-avidin technology for the enantioselective reduction of ketones by transfer hydrogenation
Most physiological and biotechnological processes rely on molecular recognition between chiral (handed) molecules. Manmade homogeneous catalysts and enzymes offer complementary means for producing enantiopure (single-handed) compounds. As the subtle details that govern chiral discrimination are difficult to predict, improving the performance of such catalyst
National Academy of Sciences.