scholarly journals Role of Mass Transfer in Phase Transfer Catalytic Heterogeneous Reaction Systems

10.5772/24291 ◽  
2011 ◽  
Author(s):  
P. A. ◽  
Maw-Ling Wang
Keyword(s):  
Mass Transfer ◽  
Phase Transfer ◽  
Heterogeneous Reaction ◽  
Reaction Systems

The Role of Electrical and Volume Transport in Heterogeneous Reaction Systems

1975 ◽  
Vol 30 (1-2) ◽  
pp. 127-128
Author(s):  
E. Kahrig ◽  
H. Beßerdich ◽  
E. Brecht ◽  
D. Kirstein
Keyword(s):  
Kinetic Parameters ◽  
Electrical Transport ◽  
Heterogeneous Reaction ◽  
Volume Transport ◽  
Concentration Profiles ◽  
Reaction Systems ◽  
Transport Measurements

Abstract For autocatalysis coupled with diffusion the local periodic concentration profiles are influenced essentially by electrical transport and convection. When diffusion is negligible for Michaelis-Menten-kinetics equations are given to determine the kinetic parameters Vmax and Km from transport measurements.

ROLE OF FLOW AND MASS TRANSFER IN PHOTOBIOREACTOR: FROM BACTERIA LOCOMOTION TO HYDROGEN PRODUCTION

2018 ◽  
Author(s):  
Xun Zhu ◽  
Qiang Liao ◽  
Rong Chen ◽  
Ao Xia ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Hydrogen Production

The role of (bio)surfactant sorption in promoting the bioavailability of nutrients localized at the solid-water interface

1999 ◽  
Vol 39 (7) ◽  
pp. 91-98 ◽  
Author(s):  
Ryan N. Jordan ◽  
Eric P. Nichols ◽  
Alfred B. Cunningham
Keyword(s):  
Mass Transfer ◽  
Cell Membrane ◽  
Substrate Concentration ◽  
Water Interface ◽  
Industrial Systems ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Surfactant Sorption

Bioavailability is herein defined as the accessibility of a substrate by a microorganism. Further, bioavailability is governed by (1) the substrate concentration that the cell membrane “sees,” (i.e., the “directly bioavailable” pool) as well as (2) the rate of mass transfer from potentially bioavailable (e.g., nonaqueous) phases to the directly bioavailable (e.g., aqueous) phase. Mechanisms by which sorbed (bio)surfactants influence these two processes are discussed. We propose the hypothesis that the sorption of (bio)surfactants at the solid-liquid interface is partially responsible for the increased bioavailability of surface-bound nutrients, and offer this as a basis for suggesting the development of engineered in-situ bioremediation technologies that take advantage of low (bio)surfactant concentrations. In addition, other industrial systems where bioavailability phenomena should be considered are addressed.

The Role of Phase Transfer Catalysis in the Microwave-Assisted N-Benzylation of Amides, Imides and N-Heterocycles

2009 ◽  
Vol 6 (7) ◽  
pp. 529-534 ◽  
Author(s):  
Istvan Greiner ◽  
Fanni Sypaseuth ◽  
Alajos Grun ◽  
Eva Karsai ◽  
Gyorgy Keglevich
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Microwave Assisted

Effects of salts on the kinetics of oxidation of alkenes by thallic salts in aqueous solutions

1981 ◽  
Vol 46 (3) ◽  
pp. 693-700 ◽  
Author(s):  
Milan Strašák ◽  
Jaroslav Majer
Keyword(s):  
Aqueous Solutions ◽  
Phase Transfer ◽  
Heterogeneous Reaction ◽  
Qualitative Model ◽  
Kinetic Effect ◽  
Tetraalkylammonium Salts ◽  
Reaction Conditions ◽  
Kinetics Of Oxidation ◽  
Kinetics Of ◽  
Heterogeneous Reaction Conditions

The kinetics of oxidation of alkenes by thallic sulphate in aqueous solutions, involving the two reaction steps-the hydroxythallation and the dethallation - was studied, and the effect of salts on the kinetics was examined; this made it possible to specify more precisely the reaction mechanism and to suggest a qualitative model of the reaction coordinate. It was found that in homogeneous as well as in heterogeneous reaction conditions, the reaction can be accelerated appreciably by adding tetraalkylammonium salts. These salts not only operate as catalysts of the phase transfer, but also exert a significant kinetic effect, which can be explained with a simplification in terms of a stabilization of the transition state of the reaction.

Role of nanomaterial's as adsorbent for heterogeneous reaction in waste water treatment

2021 ◽  
pp. 130596
Author(s):  
M. Sridevi ◽  
C. Nirmala ◽  
N. Jawahar ◽  
G. Arthi ◽  
Sugumari Vallinayagam ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Heterogeneous Reaction ◽  
Waste Water Treatment
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