scholarly journals Pressure drop and volumetric gas-phase mass transfer coefficient in a column packed with impulse packing.

1982 ◽  
Vol 15 (1) ◽  
pp. 63-66
Author(s):  
MOMINUDDIN CHOWDHURY ◽  
TAKESHI ISHIKAWA ◽  
KUNIO NAGAHAMA ◽  
MITSUHO HIRATA
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase

ABSORBSI H2S MENGGUNAKAN LARUTAN Fe-EDTA DALAM PACKED COLUMN

EKUILIBIUM ◽  
2011 ◽  
Vol 10 (2) ◽  
Author(s):  
Endang Kwartiningsih ◽  
Arif Jumari
Keyword(s):  
Mass Transfer ◽  
Liquid Phase ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase ◽  
Reaction Rate ◽  
Packed Column ◽  
Reaction Rate Constant ◽  
Absorption Process ◽  
Edta Solution

<p><strong><em>Abstract:</em></strong><strong><em> </em></strong><em>Gas purification from the content of H<sub>2</sub>S using  Fe-EDTA (Iron Chelated Solution) gave  several advantages. The advantages were  the absorbent solution can be regenerated that means  a cheap operation cost,  the separated sulfur was a solid that is easy to handle and is save to be disposal to environment. This research was done by simulation and experimental. The simulation step was done by mathematical model arrangement representing the absorption process in packed column through mass transfer arrangement such as mass transfer equations and chemical reaction. The experimental step was done with the making of Fe-EDTA solution from FeCl<sub>2</sub> and EDTA. Then Fe-EDTA solution was flown in counter current packed column that was contacted with H<sub>2</sub>S in the methane gas. By comparing gas composition result of experiment and simulation, the value of mass transfer coefficient in gas phase ( k<sub>Ag</sub>a), mass transfer coefficient in liquid phase (k<sub>Al</sub>a) and the reaction rate constant ( k) were found. The values of mass transfer coefficient in liquid phase (k<sub>Al</sub>a) were lower than values of mass transfer coefficient in gas phase (k<sub>Ag</sub>a) and the reaction rate constant (k). It meant that H<sub>2</sub>S absorption  process using Fe-EDTA absorbent solution was determined by mass transfer process in liquid phase. The higher flow rate of absorbent, the higher value of mass transfer coefficient in liquid phase. </em><em>The smaller packing diameter, the higher value of mass transfer coefficient in liquid phase.From analysis of dimension, the relation of dimensionless number between Sherwood number and flow rate of absorbent, packing diameter was</em><strong></strong></p><p> <strong><em>Keywords:</em></strong><strong><em> </em></strong><em>chemical reaction, Fe-EDTA, H<sub>2</sub>S absorption, mass transfer</em></p>

Simulation Based Optimization of Microfluidic Devices Used for Molecular Enrichment

2012 ◽  
Author(s):  
Hui Xia ◽  
Bobby Mathew ◽  
Hisham Hegab ◽  
June Feng
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Stokes Equations ◽  
Microfluidic Devices ◽  
Geometric Parameters ◽  
Operating Parameters ◽  
Inlet Concentration ◽  
Advection Diffusion Equation

Microfluidic devices are used in several engineering fields ranging from biomedical to chemical to engineering for applications such as micro reactor, target molecular enriching and cell capturing. With regard to related applications, microfluidic devices offer advantages such as high surface area to volume ratio, increased mass transfer coefficient and portability in addition to their requirement of low analytes. Affinity based microfluidic devices with microscale posts have high compactness and mass transfer coefficient. In order to maximize the benefits offered by employing microfluidic devices, it is important to apply parametric study in the device designing work. This study is aimed at studying the operating and geometric parameters of microfluidic devices with square/rectangular microscale posts. The geometric parameters, such as aspect ratio of the microposts used, could possibly decide the performance of the device. Operating parameters studied are Reynolds number, Peclet number, Damköhler number, and equilibrium reaction constant. These parameters encompass the influence of velocity, diffusivity, density, viscosity, hydraulic diameter, inlet concentration of species and absorption/desorption reaction constants. This work theoretically analyzes the influence of the above mentioned parameters using COMSOL Multiphysics 4.2.a. The governing equations of microfluidic devices, i.e. Navier-Stokes equations and the advection-diffusion equation, subjected to the above mentioned operating parameters, are solved to obtain the velocity profile, pressure drop and concentration profile of the species. The metric used for analyzing the influence of each operating parameter is the capture efficiency, i.e. the ratio of outlet concentration to inlet concentration as well the pressure drop. The results of this study would improve the design of microfluidic devices used for chemical reactions as well as that used for protein enrichment.

scholarly journals Gas-phase mass transfer coefficient of CO2 in different alkanolamine solutions within packed-bed absorption column

2020 ◽  
Author(s):  
P. Vaewhongs ◽  
K. Photein ◽  
R. Nimchareon ◽  
T. Limlertchareonwanit ◽  
K. Minakanishtha ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase ◽  
Packed Bed ◽  
Absorption Column

Evaluating hydrodynamics in a bioreactor with liquid phase dispersion in the gas phase

2020 ◽  
Vol 18 (4) ◽  
Author(s):  
Arash Arabmarkadeh ◽  
Mohsen Nosrati ◽  
Mohammad Amin Hejazi ◽  
Seyed Mohammad Mousavi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase ◽  
Flow Rate ◽  
Liquid Flow ◽  
Liquid Flow Rate ◽  
Middle Part ◽  
Hydrodynamic Properties ◽  
Phase Dispersion

AbstractBioreactors are used in many biochemical industries to produce commercial life products such as medicines, enzymes, perfumes, paints and antibiotics. In the presented study, a specially shaped bioreactor has been designed, built and operated to increase the mass transfer coefficient. The constructed bioreactor, according to type of microorganisms, can provide high amounts of oxygen or carbon dioxide. Moreover, the manuscript was aimed at investigating the hydrodynamic properties of the bioreactor. The bioreactor was constructed from three parts including shower in upper part, middle section for mass transfer and bottom section as a reservoir. Liquid flow rate, shower holes diameter, aeration velocity and the middle part height of the bioreactor have been studied as factors influencing the hydrodynamics. The results showed that the highest mass transfer coefficient was 30.1 1/h which was achieved when the liquid flow rate, the shower holes diameter, aeration velocity and middle part height of the bioreactor were 280 mL/min, 2 mm, 0.03 vvm and 60 cm, respectively.

scholarly journals Volumetric gas-phase mass transfer coefficient in baffled horizontal stirred vessels.

1980 ◽  
Vol 13 (4) ◽  
pp. 298-303 ◽  
Author(s):  
TAKASHI FUKUDA ◽  
KIYOSHI IDOGAWA ◽  
KOJI IKEDA ◽  
KOJI ANDO ◽  
KAZUO ENDOH
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase ◽  
Stirred Vessels

Comparison of Overall Gas-Phase Mass Transfer Coefficient for CO2Absorption between Tertiary Amines in a Randomly Packed Column

2015 ◽  
Vol 38 (8) ◽  
pp. 1435-1443 ◽  
Author(s):  
Le Wen ◽  
Helei Liu ◽  
Wichitpan Rongwong ◽  
Zhiwu Liang ◽  
Kaiyun Fu ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase ◽  
Packed Column ◽  
Tertiary Amines

Absorption Performance of Rotating Packed Bed with Gas-Liquid Distribution Inducer

2014 ◽  
Vol 1010-1012 ◽  
pp. 913-916
Author(s):  
Mei Jin ◽  
Li Zhan ◽  
Li Yan Zhou ◽  
Guo Xian Yu ◽  
Ping Lu
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Phase ◽  
Packed Bed ◽  
Volumetric Mass Transfer Coefficient ◽  
Liquid Distribution ◽  
Rotating Packed Bed ◽  
Different Types ◽  
Absorption Performance

Based on CO2-NaOH system, the absorption performances and the mass transfer of the rotating packed bed with the three different types of the gas-liquid distribution inducer were investigated. The experimental results showed that the structure of the gas-liquid distribution inducer have an important effect on the volumetric mass transfer coefficient and the absorptivity of CO2. Due to the enhancement of the countercurrent contact between the liquid phase and the gas phase from the installation of the distribution inducer, an increasement of the volumetric mass transfer coefficient and a higher absorptivity of CO2 could be obtained than those of the experiment in PRB without any inducers. Among the distribution inducers, the combination of the liquid distribution inducer of Type-B and the gas distribution inducer of Type-A could give a better volumetric mass transfer coefficient and a higher absorptivity of CO2, which were 27.84×10-3 s-1 and 80.00%, respectively.

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