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2 edition of Catalytic hydrogenation in a cocurrent downflow contactor reactor found in the catalog.

Catalytic hydrogenation in a cocurrent downflow contactor reactor

Zaffer Khan

Catalytic hydrogenation in a cocurrent downflow contactor reactor

by Zaffer Khan

  • 343 Want to read
  • 28 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Chemical Engineering, 1996.

Statementby Zaffer Khan.
ID Numbers
Open LibraryOL21764043M

  Gas−liquid interfacial area have been determined by means of chemically enhanced absorption of CO2 in nitrogen as the carrier gas into DEA as well as DEA−ETG aqueous solutions in a packed bed upflow bubble column reactor with an inner diameter of mm. The influence of the reactor pressure, gas and liquid superficial velocities as well as liquid phase viscosities and packing . The hydrodynamics and mass transfer characteristics of a concurrent downflow contactor (CDC) are studied in this work in order to investigate the viability of this bubble column as a catalytic reactor for the hydrogenation of α,β-unsaturated aldehydes. Oxygen/water was used as the system throughout.

Andrzej Burghardt, Grażyna Bartelmus, Mieczysław Jaroszyński, Andrzej Kołodziej, Hydrodynamics and mass transfer in a three-phase fixed-bed reactor with cocurrent gas—liquid downflow, The Chemical Engineering Journal and the Biochemical Engineering Journal, . The catalytic partial hydrogenation reaction of 2-methylbutynol (3) is an in-depth studied process, mainly because the alkene product (3a) is an important intermediate for the industrial synthesis of vitamins (A, E), as well as a variety perfumes [–]. The current manufacturing process is based on the Lindlar or other Pd-based.

A short review of recent advances in CO2 hydrogenation to hydrocarbons over heterogeneous catalysts Wenhui Li,a Haozhi Wang,a Xiao Jiang,c Jie Zhu,a Zhongmin Liu,b Xinwen Guo *a and Chunshan Song*ac CO 2 hydrogenation to hydrocarbons is a promising way of making waste to wealth and energy storage, which also solves the environmental and energy issues caused by CO. Tilston and J. M. Winterbottomm (), “The Cocurrent Downflow Contactor (CDC) Reactor: Chemically enhanced mass transfer and reaction studies for slurry and fixed-bed catalytic hydrogenation.


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Catalytic hydrogenation in a cocurrent downflow contactor reactor by Zaffer Khan Download PDF EPUB FB2

The Cocurrent Downflow Contactor (CDC) has been studied as a three phase reactor and in addition, chemically enhanced mass transfer studies have confirmed the very high gas hold‐up values previously indicated by photographic methods (ε g = 05–06).

Mass transfer measurements for the O 2 /H 2 O system have shown that volumetric mass transfer coefficients (k L a) are in the range 025 Cited by:   The cocurrent downflow contactor (CDC) reactor-chemically enhanced mass transfer & reaction studies for slurry & fixed bed catalytic hydrogenation Author links open overlay panel A.P.

Boyes A. Chughtai X.X. Lu S. Raymahasay S. Sarmento M.W. Tilston J.M. Winterbottom (92)O Get rights and contentCited by:   The cocurrent downflow contactor reactor (CDCR) has been found to give low mass transfer resistances both in slurry and packed bed catalytic operation.

The hydrogenation of propanol solutions of itaconic acid in the range – kPa and 20–70°C and of soyabean oil in the range – kPa and –°C was studied using slurry (5% Cited by: The Cocurrent Down-flow Contactor (CDC) Reactor - Chemically Enhanced Mass-Transfer and Reaction Studies for Slurry and Fixed-Bed Catalytic-Hydrogenation Article (PDF Available)   in   Chemical.

The hydrogenation of 2-butyne-1,4-diol over a commercial 5% Pd/charcoal and a 5% Pd/TiO 2 catalyst prepared in-house was investigated and the selectivity towards cisbutene-1,4-diol under various reaction conditions is experiments were carried out in a glass stirred tank reactor (STR) and a cocurrent downflow contactor reactor (CDCR).Cited by: The performance of a cocurrent downflow contactor (CDC) bubble column reactor has been examined using a first order reaction involving the palladium catalyzed hydrogenation of itaconic acid.

Catalytic hydrogenation in a cocurrent downflow contactor reactor Author: In order to investigate the full mass transfer potential of the CDC reactor as a three phase chemical reactor, model reactants were hydrogenated in the CDC operating as a packed bed and slurry reactor.

swirlflow was fitted to the lower region of the column for. The catalytic hydrodechlorination reaction worked well with organic, inorganic and even in the absence of base in cocurrent downflow contactor reactor.

Reaction was completed with faster reaction rate in the presence of potassium hydroxide. The catalytic hydrodechlorination of 2,4-dichlorophenol (2,4-DCP) as a model pollutant has been conducted for evaluation of optimum base in laboratory scale cocurrent downflow contactor reactor (CDCR).

2,4-DCP was completely dechlorinated with an initial concentration of and mmol, at K temperature and MPa pressure.

Abstract The performance of a cocurrent downflow contactor (CDC) bubble column reactor has been examined using a first order reaction involving the palladium catalyzed hydrogenation of itaconic acid. The Cocurrent Downflow Contactor (CDC) has been developed as a mass transfer and reactor device, with and without addition of tangential (swirl) flow, giving gas hold-up (Eg) values of – Winterbottom., The cocurrent downflow contactor (CDC) reactor- Chemically enhanced mass transfer & reaction studies for slurry & fixed bed catalytic hydrogenation, Chemical Engineering Science, The Cocurrent Downflow Contactor (CDC) as a fixed bed and slurry reactor for catalytic hydrogenation September Journal of Chemical Technology & Biotechnology A.

Boyes. Content: Trickling and pulsing transition in cocurrent downflow trickle-bed reactors with special reference to large-scale columns / D.M. Dimenstein, S.P. Zimmerman, and K.M. Ng --Influence of the reactional system on the irrigation rate in trickle-bed reactors / P.

Ruiz, M. Crine, A. Germain, and G. L'Homme --A comparison of current models for isothermal trickle-bed reactors: application to. “The Cocurrent Downflow Contactor- A novel reactor for Gas-Liquid-Solid Catalyzed Reactions” Chemical Engineering and Technology, Oct.

(),Germany. “The Cocurrent Downflow Contactor (CDC) as a Fixed Bed and Slurry Reactor for Catalytic Hydrogenation” J. of Chemical Technology and Biotechnology,1: Pd-based catalytic nanoparticles can be immobilized on the surface of porous inorganic or polymeric membranes, thus providing a new type of catalytic membrane reactor, called catalytic contactor.

According to the proposed classification (Miachon and Dalmon ), depending on the mode of supply of reagents, two types of catalytic contactors. Selective catalytic hydrogenation of 2-butyne-1,4-diol to cisbutene-1,4-diol in mass transfer efficient slurry reactors.

, DOI: /S(97) Robert Wild, Richard R. Schmidt. Synthesis of sphingosines, Convenient synthesis of phytosphingosine and sphinganine fromD-galactal andD-arabitol. The cocurrent downflow operation is compared to the cocurrent upflow.

The olefin hydrogenation reaction is found to be severely limited by mass‐transfer rates. Because of intensified mass transfer inside the small catalyst channel, substantial olefin conversion (>50%) is achieved even at unconventionally high LHSV (∼ v/v/h).

Catalytic hydrogenation of o-nitroanisole in a microreactor: Reactor performance and kinetic studies. Gas-liquid catalytic hydrogenation reaction in small catalyst channel. Hydrodynamics and Solvent Effects in a Monolith Cocurrent Downflow Contactor (CDC) Reactor.

The Canadian Journal of Chemical Engineering The residence time distribution in liquid phase was measured in a cocurrent upflow packed bed reactor for the system methanol‐hydrogen at low Reynolds numbers and at elevated pressure.

The plug flow with axial dispersion model was used to describe mixing in the system. Mass transfer coefficients for the hydrogenation of α‐methylstyrene were measured in a packed‐bed reactor with concurrent gas and liquid upflow.

The packing was. Pioneering studies by Gryaznov and his coworkers have encouraged the use of palladium and palladium alloy membranes in catalytic membrane reactors, including fundamental studies on selective hydrogenation of various unsaturated hydrocarbons, for example, acetylene, 1,3-pentadiene, and cyclopentadiene.

The Co-current Down flow Contactor (CDC)as a Fixed Bed and Slurry Reactor for Catalytic Hydrogenation J. Chem. Tech. Biotechnol. / Wiley The Cocurrent Downflow Contactor (CDC) has been studied as a three phase reactor and in addition, chemically enhanced mass transfer studies confirmed the very high gas hold-up values previously indicated Title: Working as Researcher in the .