𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Raney-nickel catalyzed hydrogenations: Gas-liquid mass transfer in gas-induced stirred slurry reactors

✍ Scribed by E. Dietrich; C. Mathieu; H. Delmas; J. Jenck

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
799 KB
Volume
47
Category
Article
ISSN
0009-2509

No coin nor oath required. For personal study only.

✦ Synopsis

Gas-liquid mass transfer in gas induced stirred reactors has been investigated by the method of physical absorption

, based on pressure variation.

Using two different gas-inducers, liquid composition temperature and height in the reactor, gas pressure and type. solid catalyst type and concentration have been varied in a lab reactor. Without solid phase, the data correlated with the stirrer speed as well as with the energy dissipation rate deduced from torque measurements.

which proves the equivalent efficiencies of the two gasinducers. Very complex and striking effects of small addition of catalyst were observed, depending on the nature of the Raney nickel, pyrophoric or not, and on the liquid phase, stressing the need of measurements with the actual liquid and solid phases. Important react-on rate enhancement could result from a convenient catalyst-solvent system involving catalyst adhesion or shuttling at gas-liquid interfaces.

πŸ“œ SIMILAR VOLUMES

Hydrogenation of adiponitrile catalyzed
Hydrogenation of adiponitrile catalyzed by raney nickel use of intrinsic kinetics to measure gas-liquid mass transfer in a gas induced stirred slurry reactor
✍ C. Matthieu; E. Dietrich; H. Delmas; J. Jenck πŸ“‚ Article πŸ“… 1992 πŸ› Elsevier Science 🌐 English βš– 586 KB

Three phase hydrogenation of adiponitrile (ADN) to hexamethylene diamine (HMD) proceeds via aminocapronitrile (ACN). In a first step it has been investigated in selected conditions of temperature, pressure, reagent and catalyst concentrations, avoiding external and intraparticle transfer limitations

Solid effects on gas-liquid mass transfe
Solid effects on gas-liquid mass transfer in three-phase slurry catalytic hydrogenation of adiponitrile over raney nickel
✍ C. Joly-Vuillemin; C. de Bellefon; H. Delmas πŸ“‚ Article πŸ“… 1996 πŸ› Elsevier Science 🌐 English βš– 548 KB

Many three-phase catalytic reactions are limited by gas-liquid mass translbr. Pre'~aous works have round the transI~er rate to be increased by the presence of fine catalyst particles. Most of the studies concerned active carbon particles m aqueous media This paper inten&s to peint out and to explain

Gas/liquid interfacial area per unit vol
Gas/liquid interfacial area per unit volume and volumetric mass transfer coefficient in stirred slurry reactors
✍ Dr.-Ing. Michael Schmitz; Dr.-Ing. Artur Steiff; Prof. Dr.-Ing. Paul-Michael Wei πŸ“‚ Article πŸ“… 1987 πŸ› John Wiley and Sons 🌐 English βš– 899 KB

In three-phase systems, where the liquid constitutes the continuous phase, solid is the catalyst and gas represents the dispersed phase, there are decisive criteria which have to be observed in reactor design. These are e.g. the interfacial area per unit volume between gas and liquid, the volumetric

Gas–liquid mass transfer in a new three-
Gas–liquid mass transfer in a new three-phase stirred airlift reactor
✍ Wang Bang; Iordan Nikov; Hami Delmas; AimΓ© Bascoul πŸ“‚ Article πŸ“… 1998 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 256 KB πŸ‘ 2 views

The gasÈliquid mass transfer performances of a novel three-phase reactor involving both airlift and mechanical stirring have been tested using aqueous solutions of glucose. Stirring in addition to classical airlift leads to an importance increase of The absolute increase depends mainly on the stirr