scholarly journals Hydrodynamic and Mass Transfer in the Desorption Process of CO2 Gas in a Packed-Bed Stripper

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 46
Author(s):  
Pao Chi Chen ◽  
Ming-Wei Yang ◽  
Yan-Lin Lai
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Total Pressure ◽  
Mixed Solvent ◽  
Liquid Flow Rate ◽  
Packed Bed ◽  
Process Variables ◽  
Desorption Process ◽  
Co2 Gas ◽  
Transfer Data

A lab-scale packed-bed stripper containing Dixon rings was used to explore the effects of the process variables on the hydrodynamics and mass-transfer in a stripper using a mixed solvent loaded CO2. The variables are the liquid flow rate, reboiler temperature, and amine concentration, and the hydrodynamic and mass-transfer data can be determined using different models. In the case of hydrodynamics, the dimensionless pressure drop at the flooding point and the total pressure drop were explored first. In the case of mass-transfer, the correlation of the mass-transfer coefficient and the parameter importance were also observed. In addition, the number of plates per meter can be compared with the Dixon rings manufacturer. Finally, the performances of a mixed solvent and monoethanolamine (MEA) solvent were also discussed.

scholarly journals TOTAL VOLUMETRIC MASS TRANSFER COEFFICIENT AT CO2 GAS ABSORPTION USING K2CO3 BY MSG PROMOTER

Konversi ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 6
Author(s):  
Erlinda Ningsih ◽  
Abas Sato ◽  
Mochammad Alfan Nafiuddin ◽  
Wisnu Setyo Putranto
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Flow Rate ◽  
Liquid Flow ◽  
Total Mass ◽  
Gas Flow ◽  
Liquid Flow Rate ◽  
Gas Flow Rate ◽  
Co2 Gas

Abstract- One of the most widely used processes for CO2 gas removal is Absorption. Carbon dioxide is the result of the fuel combustion process which of the hazardous gases. The aim of this research is to determine the total mass transfer coefficient and analyze the effect of the absorbent flow rate of the absorbent solution with the promoter and the gas flow rate to the total mass transfer coefficient value. The variables consisted of liquid flow rate: 1, 2, 3, 4, 5 liter/min, gas flow rate: 15, 25, 30, 40, 50 liter/min and MSG concentration: 0%, 1%, 3% and 5% by weight. The solution of Pottasium Carbonate as absorbent with MSG promoter is flowed through top column and CO2 gas flowed from bottom packed column. Liquids were analyzed by titration and the gas output was analyzed by GC. From this research, it is found that the flow rate of gas and the liquid flow rate is directly proportional to the value of KGa. The liquid flow rate variable 5 liters / minute, gas flow rate 15 l / min obtained value of KGa 11,1102 at concentration of MSG 5%. Keywords:  Absorption, CO2,  K2CO3, MSG. 

MONOPHASIC REACTION WITH A PACKED BED MICROREACTOR: CHARACTERIZATION OF MASS TRANSFER AND REACTION

2020 ◽  
Vol 20 (06) ◽  
pp. 2050033
Author(s):  
YAO CHEN ◽  
XUEYE CHEN
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Catalytic Reaction ◽  
Conversion Rate ◽  
Packed Bed ◽  
Particle Radius ◽  
Channel Structure ◽  
Clear Change

In this paper, the monophasic catalytic reaction in the microreactor is studied. Several factors that may affect the catalytic reaction are discussed, including the pressure drop, the size of catalyst particles, and the channel structure. Finally, some important conclusions can be reached. The change of pressure drop has an effect on the reaction. For example, the C3H6 conversion rate is 62.88% when the pressure drop is 8[Formula: see text]atm, and the C3H6 conversion rate is 61.78% when the pressure drop is 11[Formula: see text]atm. The effect of the change particle radius is not obvious on the reaction. Enhancing the mixing of substances before entering the reaction domain is helpful to the catalytic reaction. There are different substances concentration in catalyst particles at different positions in microreactors. But from the surface to the inside of catalyst particles, the substances concentration has a clear change rule.

scholarly journals Experimental Evaluation of Sulfur Dioxide Absorption in Water Using Structured Packing

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Rosa-Hilda Chavez ◽  
Nicolas Flores-Alamo ◽  
Javier de J. Guadarrama
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Nuclear Research ◽  
Packed Bed ◽  
Performance Model ◽  
Two Phase ◽  
Average Deviation ◽  
Absorption Column ◽  
Structured Packing ◽  
Transfer Unit

An experimental study of hydrodynamic and mass transfer processes was carried out in an absorption column of 0.252 m diameter and 3.5 m of packed bed height developed by Mexican National Institute of Nuclear Research (ININby its acronym in Spanish) of stainless steel gauze corrugated sheet packing by means of SO2-air-water systems. The experiments results include pressure drop, flows capacity, liquid hold-up, SO2composition, and global mass transfer coefficient and mass transfer unit height by mass transfer generalized performance model in order to know the relationship between two-phase countercurrent flow and the geometry of packed bed. Experimental results at loading regimen are reported as well as model predictions. The average deviation between the measured values and the predicted values is±5% of 48-data-point absorption test. The development of structured packing has allowed greater efficiency of absorption and lower pressure drop to reduce energy consumption. In practice, the designs of equipment containing structured packings are based on approximations of manufacturer recommendations.

scholarly journals Designed porous milli-scale reactors with enhanced interfacial mass transfer in two-phase flows

2017 ◽  
Vol 2 (2) ◽  
pp. 137-148 ◽  
Author(s):  
Aditi Potdar ◽  
Lidia N. Protasova ◽  
Leen Thomassen ◽  
Simon Kuhn
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Packed Bed ◽  
Transfer Performance ◽  
Two Phase Flows ◽  
Two Phase ◽  
Reduced Pressure ◽  
Packed Bed Reactors ◽  
Interfacial Mass Transfer

Designed porous milli-scale reactors with enhanced mass transfer performance and reduced pressure drop compared to conventional packed bed reactors.

scholarly journals DESIGN OF A PACKED-BED ABSORPTION COLUMN CONSIDERING FOUR PACKING TYPES AND APPLYING MATLAB

2016 ◽  
Vol 29 (2) ◽  
pp. 83-104 ◽  
Author(s):  
A. Pérez Sánchez ◽  
E. J. Pérez Sánchez ◽  
R. Segura Silva
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Gas Phase ◽  
Phase Transfer ◽  
Packed Bed ◽  
Design Parameters ◽  
Microsoft Excel ◽  
Absorption Column ◽  
Transfer Unit ◽  
Gaseous Stream

In the present work, a packed bed absorption column is designed to recover certain amounts of ethanol contained in a gaseous stream. Four packing types (50-mm metal Hiflow® rings, 50-mm ceramic Pall® rings, 50-mm metal Top Pak® rings and 25-mm metal VSP® rings) are considered in order to select the most appropriate one in terms of column dimensions, pressure drop and mass-transfer results. Several design parameters were determined including column diameter (D), packing height (Z), overall mass-transfer coefficient (Km) and gas pressure drop (P/Z), as well as the overall number of gas-phase transfer units (NtOG), overall height of a gas-phase transfer unit (HtOG) and the effective surface area of packing (ah). The most adequate packing to use for this absorption system constitutes the 25-mm metal VSP® rings, since it provided the greatest values of Km (0.325 kmol/m3.s), and ah (169.57 m-1), as well as the lowest values of both Z (0.6 m) and HtOG (0.145 m), meaning that it will supply the higher mass-transfer conditions with the lowest column dimensions. The influence of both gas mixture (QG) and solvent (mL) feed flowrates on D, Z, Km, P/Z, NtOG and HtOG was also evaluated for the four packing considered. The design methodology was solved using computing software MATLAB® version 7.8.0.347 (R2009a) (Math Works, 2009), and also Microsoft Excel®.D

scholarly journals Design of 3D-printed structures for improved mass transfer and pressure drop in packed-bed reactors

2021 ◽  
pp. 129762
Author(s):  
Lucas Chatre ◽  
Joseph Socci ◽  
Samuel J. Adams ◽  
Petr Denissenko ◽  
Nikolay Cherkasov
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Packed Bed ◽  
Packed Bed Reactors ◽  
3D Printed

scholarly journals Metal Foams as Novel Catalyst Support in Environmental Processes

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 587 ◽  
Author(s):  
Anna Gancarczyk ◽  
Katarzyna Sindera ◽  
Marzena Iwaniszyn ◽  
Marcin Piątek ◽  
Wojciech Macek ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Mechanical Stability ◽  
Packed Bed ◽  
Metal Foams ◽  
High Porosity ◽  
Slow Kinetics

Metal foams are considered as promising catalyst carriers due to their high porosity, large specific surface area, and satisfactory thermal and mechanical stability. The study presents heat transfer and pressure drop experiments performed for seven foams of different pore densities made from diverse metals. Mass transfer characteristics are derived using the Chilton–Colburn analogy. It was found that the foams display much more intense heat/mass transfer than a monolith, comparable to packed bed. Next, the foams’ efficiencies have been compared, using 1D reactor modeling, in catalytic reactions displaying either slower (selective catalytic reduction of NOx) or faster kinetics (catalytic methane combustion). For the slow kinetics, the influence of carrier specific surface area at which catalyst can be deposited (i.e., catalyst amount) was decisive to achieve high process conversion and short reactor. For this case, monolith appears as the best choice assuming it’s the lowest pressure drop. For the fast reaction, the mass transfer becomes the limiting parameter, thus solid foams are the best solution.

Hydrodynamics and Mass Transfer Behavior of a Novel Structured Packing with Diversion Windows

2011 ◽  
Vol 391-392 ◽  
pp. 1459-1463 ◽  
Author(s):  
Xue Li ◽  
Chun Jiang Liu ◽  
Xi Gang Yuan
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
High Capacity ◽  
Transfer Efficiency ◽  
The Novel ◽  
Growth Trend ◽  
Desorption Process ◽  
Structured Packing ◽  
Mass Transfer Efficiency ◽  
Slight Growth

A novel structured packing with diversion windows is developed with the objective of achieving comparable pressure drop, high capacity and preferable mass transfer efficiency. The hydrodynamics and mass transfer performance of the packing have been investigated using a 384 mm diameter column. Carbon dioxide desorption process for mass transfer experiments at room temperatures and atmospheric pressures were conducted. Compared with the traditional Mellapak 350X, both the liquid holdup and mass transfer efficiency of the novel structured packing (350X with diversion windows) are increased by 15% or so; additionally, the pressure drop presented a slight growth trend, about 20% higher. It is concluded that the novel structured packing with adding diversion windows can change the flow pattern of the liquid film on the packing sheet and increase the effective mass transfer area, as well as the gas-liquid mass transfer efficiency.

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