Novel Evidence on the Role of the Nucleophilic Intermediate Complex in the Orito-Reaction: Unexpected Inversion in the Enantioselective Hydrogenation of 2,2,2-Trifluoroacetophenone on Pt-Cinchona Chiral Catalyst Using Continuous-Flow Fixed-Bed Reactor

2009 ◽  
Vol 134 (3-4) ◽  
pp. 264-269 ◽  
Author(s):  
György Szőllősi ◽  
Szabolcs Cserényi ◽  
Mihály Bartók
Keyword(s):  
Continuous Flow ◽  
Fixed Bed ◽  
Enantioselective Hydrogenation ◽  
Fixed Bed Reactor ◽  
Intermediate Complex ◽  
Chiral Catalyst ◽  
Orito Reaction

Reversal of the ee in enantioselective hydrogenation of activated ketones in continuous-flow fixed-bed reactor system

2010 ◽  
Vol 12 (1) ◽  
pp. 14-19 ◽  
Author(s):  
Szabolcs Cserényi ◽  
György Szőllősi ◽  
Kornél Szőri ◽  
Ferenc Fülöp ◽  
Mihály Bartók
Keyword(s):  
Continuous Flow ◽  
Fixed Bed ◽  
Enantioselective Hydrogenation ◽  
Reactor System ◽  
Fixed Bed Reactor

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

Design of a continuous flow immobilized-cell reactor for biosynthetical production of L-aspartic acid

1985 ◽  
Vol 50 (10) ◽  
pp. 2122-2133 ◽  
Author(s):  
Jindřich Zahradník ◽  
Marie Fialová ◽  
Jan Škoda ◽  
Helena Škodová
Keyword(s):  
Aspartic Acid ◽  
Continuous Flow ◽  
Immobilized Cells ◽  
Scale Up ◽  
Fixed Bed ◽  
Packed Bed ◽  
Fixed Bed Reactor ◽  
Experimental Program ◽  
Design Parameters ◽  
Immobilized Cell

An experimental study was carried out aimed at establishing a data base for an optimum design of a continuous flow fixed-bed reactor for biotransformation of ammonium fumarate to L-aspartic acid catalyzed by immobilized cells of the strain Escherichia alcalescens dispar group. The experimental program included studies of the effect of reactor geometry, catalytic particle size, and packed bed arrangement on reactor hydrodynamics and on the rate of substrate conversion. An expression for the effective reaction rate was derived including the effect of mass transfer and conditions of the safe conversion-data scale-up were defined. Suggestions for the design of a pilot plant reactor (100 t/year) were formulated and decisive design parameters of such reactor were estimated for several variants of problem formulation.

Synthesis of lower olefins from syngas over Zn/Al2O3–SAPO-34 hybrid catalysts: role of doped Zr and influence of the Zn/Al2O3ratio

2018 ◽  
Vol 8 (14) ◽  
pp. 3527-3538 ◽  
Author(s):  
G. Raveendra ◽  
Congming Li ◽  
Bin Liu ◽  
Yang Cheng ◽  
Fanhui Meng ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Lower Olefins ◽  
Hybrid Catalysts

Hybrid catalysts composed of different loadings of Zr-promoted Zn/Al2O3with SAPO-34 zeolite were investigated for the direct synthesis of lower olefins from syngas in a fixed-bed reactor.

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