scholarly journals How to avoid mass transfer limitations in ozonation kinetics of phenylphenol isomers?

2016 ◽  
Vol 37 (1) ◽  
pp. 5-13 ◽  
Author(s):  
Magdalena Olak-Kucharczyk ◽  
Stanisław Ledakowicz
Keyword(s):  
Mass Transfer ◽  
Rate Constants ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Liquid System ◽  
Chemical Absorption ◽  
Mass Transfer Limitation ◽  
Fast Reactions ◽  
Liquid Mass Transfer ◽  
Kinetics Of

Abstract Ozonation is a heterogeneous process of chemical absorption often controlled by a gas-liquid mass transfer rate. This paper presents the results of kinetics in a reaction between phenylphenol isomers and ozone. The degradation of phenylphenol isomers during ozonation proceeds quite fast. In order to avoid the influence of mass transfer limitation the kinetics experiments were conducted in a homogenous liquid-liquid system. The second-order rate constants were determined using classical and competition methods, which are especially recommended for fast reactions. The determined rate constants at pH 2 using the two different methods are almost the same. The increase of pH causes an increase of rate constants for the reaction of phenylphenol isomers with ozone.

Influence of a Second Liquid Phase upon Carbon Dioxide Chemical Absorption

2013 ◽  
Vol 11 (1) ◽  
pp. 511-516 ◽  
Author(s):  
A. Couvert ◽  
A. García‐Abuín ◽  
D. Gómez‐Díaz ◽  
J. M. Navaza ◽  
P. Rodríguez-Dafonte
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Transfer Rate ◽  
Gas Flow ◽  
Silicone Oil ◽  
Mass Transfer Rate ◽  
Liquid System ◽  
Carbon Dioxide Absorption ◽  
Chemical Absorption

Abstract This work analyzes carbon dioxide mass transfer rate during chemical absorption from a gas phase to a liquid–liquid system based on an aqueous phase (glucosamine or pyrrolidine solutions) and an organic one. Two different kinds of silicone oil with different viscosity were used to perform the liquid phases, and it allows the analysis of the influence of this variable upon mass transfer rate. In these systems, a surfactant (Tween80) was added to stabilize the liquid–liquid system, and therefore, the influence of the presence of this surfactant in the liquid phase was studied. This substance produces a positive effect upon carbon dioxide absorption rate in glucosamine aqueous solutions, but the opposite effect was observed for the other amine employed in this work. Also, the influence caused by different operation variables, such as the gas flow-rate fed to the bubble contactor or the silicone oil concentration in the liquid phase, was studied.

Enhancement of formic acid production from CO2 in formate dehydrogenase reaction using nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 109978-109982 ◽  
Author(s):  
Young-Kee Kim ◽  
Sung-Yeob Lee ◽  
Byung-Keun Oh
Keyword(s):  
Mass Transfer ◽  
Formic Acid ◽  
Acid Production ◽  
Transfer Rate ◽  
Formate Dehydrogenase ◽  
Mass Transfer Rate ◽  
Liquid Mass ◽  
Dehydrogenase Reaction ◽  
Liquid Mass Transfer ◽  
Mesoporous Nanoparticles

In an enzyme process using a gas substrate, the enhanced gas liquid mass transfer rate of the gas substrate by methyl-functionalized mesoporous nanoparticles could improve the productivity.

scholarly journals Ozone mass transfer behaviors on physical and chemical absorption for hollow fiber membrane contactors

2017 ◽  
Vol 76 (6) ◽  
pp. 1360-1369 ◽  
Author(s):  
Yong Zhang ◽  
Kuiling Li ◽  
Jun Wang ◽  
Deyin Hou ◽  
Huijuan Liu
Keyword(s):  
Mass Transfer ◽  
Hollow Fiber ◽  
Transfer Rate ◽  
Reaction Rate ◽  
Hollow Fiber Membrane ◽  
Mass Transfer Rate ◽  
Fiber Membrane ◽  
Chemical Absorption ◽  
Physical Absorption ◽  
Membrane Contactors

To understand the mass transfer behaviors in hollow fiber membrane contactors, ozone fluxes affected by various conditions and membranes were investigated. For physical absorption, mass transfer rate increased with liquid velocity and the ozone concentration in the gas. Gas flow rate was little affected when the velocity was larger than the critical value, which was 6.1 × 10−3m/s in this study. For chemical absorption, the flux was determined by the reaction rate between ozone and the absorbent. Therefore, concentration, species, and pH affected the mass transfer process markedly. For different absorbents, the order of mass transfer rate was the same as the reaction rate constant, which was phenol, sodium nitrite, hydrogen peroxide, and oxalate. Five hydrophobic membranes with various properties were employed and the mass transfer behavior can be described by the Graetz–Lévèque equation for the physical absorption process. The results showed the process was controlled by liquid film and the gas phase conditions, and membrane properties did not affect the ozone flux. For the chemical absorption, gas film, membrane and liquid film affected the mass transfer together, and none of them were negligible.

scholarly journals Effect of Particle Penetration Depth on Solid/liquid Mass Transfer Rate by Particle Blowing Technique

2017 ◽  
Vol 57 (11) ◽  
pp. 1902-1910 ◽  
Author(s):  
Takahiro Okuno ◽  
Md. Azhar Uddin ◽  
Yoshiei Kato ◽  
Sang Beom Lee ◽  
Yong Hwan Kim
Keyword(s):  
Mass Transfer ◽  
Penetration Depth ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Liquid Mass ◽  
Particle Penetration ◽  
Liquid Mass Transfer ◽  
Solid Liquid
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