A noninvasive X-ray technique for determination of liquid holdup in a rotating packed bed

2015 ◽  
Vol 138 ◽  
pp. 244-255 ◽  
Author(s):  
Yucheng Yang ◽  
Yang Xiang ◽  
Guangwen Chu ◽  
Haikui Zou ◽  
Yong Luo ◽  
...  
Keyword(s):  
Packed Bed ◽  
Liquid Holdup ◽  
X Ray ◽  
Rotating Packed Bed

scholarly journals Prediction of Liquid Holdup in Countercurrent-Flow Rotating Packed Bed

2000 ◽  
Vol 78 (3) ◽  
pp. 397-403 ◽  
Author(s):  
Chia-Chang Lin ◽  
Yu-Shao Chen ◽  
Hwai-Shen Liu
Keyword(s):  
Packed Bed ◽  
Countercurrent Flow ◽  
Liquid Holdup ◽  
Rotating Packed Bed

scholarly journals Preparation of TiO2 and Fe-TiO2 with an Impinging Stream-Rotating Packed Bed by the Precipitation Method for the Photodegradation of Gaseous Toluene

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1173 ◽  
Author(s):  
Guangping Zeng ◽  
Qiaoling Zhang ◽  
Youzhi Liu ◽  
Shaochuang Zhang ◽  
Jing Guo
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Packed Bed ◽  
Pure Tio2 ◽  
Precipitation Method ◽  
Nano Tio2 ◽  
X Ray ◽  
Rotating Packed Bed ◽  
Bet Analysis ◽  
Gaseous Toluene

Nano-TiO2 has always been one of the most important topics in the research of photocatalysts due to its special activity and stability. However, it has always been difficult to obtain nano-TiO2 with high dispersion, a small particle size and high photocatalytic activity. In this paper, nano-TiO2 powder was prepared by combining the high-gravity technique and direct precipitation method in an impinging stream-rotating packed bed (IS-RPB) reactor followed by Fe3+ in-situ doping. TiOSO4 and NH3·H2O solutions were cut into very small liquid microelements by high-speed rotating packing, and the mass transfer and microscopic mixing of the nucleation and growth processes of nano-TiO2 were strengthened in IS-RPB, which was beneficial to the continuous production of high quality nano-TiO2. Pure TiO2 and iron-doped nano-TiO2 (Fe-TiO2) were obtained in IS-RPB and were investigated by means of X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) and Brunauer–Emmett–Teller (BET) analysis, which found that pure TiO2 had a particle size of about 12.5 nm, good dispersibility and a complete anatase crystal at the rotating speed of packing of 800 rpm and calcination temperature of 500 °C. The addition of Fe3+ did not change the crystalline structure of TiO2. Iron was highly dispersed in TiO2 without the detection of aggregates and was found to exist in a positive trivalent form by XPS. With the increase of iron doping, the photoresponse range of TiO2 to visible light was broadened from 3.06 eV to 2.26 eV. The degradation efficiency of gaseous toluene by Fe-TiO2 under ultraviolet light was higher than that of pure TiO2 and commercial P25 due to Fe3+ effectively suppressing the recombination of TiO2 electrons and holes; the highest efficiency produced by 1.0% Fe-TiO2 was 95.7%.

BiPO4/Bi2S3-HKUST-1-MOF as a novel blue light-driven photocatalyst for simultaneous degradation of toluidine blue and auramine-O dyes in a new rotating packed bed reactor: optimization and comparison to a conventional reactor

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63667-63680 ◽  
Author(s):  
S. Mosleh ◽  
M. R. Rahimi ◽  
M. Ghaedi ◽  
K. Dashtian ◽  
S. Hajati
Keyword(s):  
Blue Light ◽  
Toluidine Blue ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
X Ray ◽  
Reactor Optimization ◽  
Rotating Packed Bed ◽  
Auramine O ◽  
Simultaneous Degradation

BiPO4/Bi2S3-HKUST-1-MOF as a novel blue light active photocatalyst was synthesized and characterized by X-ray XRD, SEM, PL, BET, BJH and DRS.

Novel Application of X-ray Computed Tomography:  Determination of Gas/Liquid Contact Area and Liquid Holdup in Structured Packing

2007 ◽  
Vol 46 (17) ◽  
pp. 5734-5753 ◽  
Author(s):  
Christian W. Green ◽  
John Farone ◽  
Julie K. Briley ◽  
R. Bruce Eldridge ◽  
Richard A. Ketcham ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contact Area ◽  
Liquid Holdup ◽  
Structured Packing ◽  
X Ray ◽  
X Ray Computed

Systematic Approach to Determination of Maximum Achievable Capture Capacity via Leaching and Carbonation Processes for Alkaline Steelmaking Wastes in a Rotating Packed Bed

2013 ◽  
Vol 47 (23) ◽  
pp. 13677-13685 ◽  
Author(s):  
Shu-Yuan Pan ◽  
Pen-Chi Chiang ◽  
Yi-Hung Chen ◽  
Chun-Da Chen ◽  
Hsun-Yu Lin ◽  
...  
Keyword(s):  
Systematic Approach ◽  
Packed Bed ◽  
Rotating Packed Bed ◽  
Capture Capacity

Full-Scale CFD Modeling of Multiphase Flow Distribution in a Packed-bed Absorber with Structured Packing Mellapak 250Y

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Omar M. Basha ◽  
Rui Wang ◽  
Isaac K. Gamwo ◽  
Nicholas S. Siefert ◽  
Badie I. Morsi
Keyword(s):  
Computed Tomography ◽  
Pressure Drop ◽  
Packed Bed ◽  
Absorption Efficiency ◽  
Full Scale ◽  
Cfd Model ◽  
Liquid Holdup ◽  
Structured Packing ◽  
X Ray ◽  
X Ray Computed

AbstractA full-scale multi-environment Eulerian CFD model for a countercurrent packed-bed absorber with structured packing Mellapak 250Y was built in ANSYS Fluent 2019 R1 in order to model CO2 capture using physical solvents. The objective of the model is to predict the overall absorber gas-liquid internal flow profiles within the complex packing geometry, while accurately predicting the hydrodynamic parameters, such as liquid holdup and pressure drop. The gas-solid and gas-liquid drag coefficients were fitted and validated using the following experimental data by Green et al. (2006. “Hydraulic Characterization of Structured Packing via X-ray Computed Tomography”; 2007. “Novel Application of X-ray Computed Tomography: Determination of Gas/liquid Contact Area and Liquid Holdup in Structured Packing.” Industrial & Engineering Chemistry Research 46: 5734–53.): dry pressure drop, irrigated pressure drop, and liquid holdup. The validated CFD model was used to study the effect of liquid distributor design on the liquid distribution in the absorber using three distributors provided with seven, thirteen, and twenty orifices of 0.2 mm diameter. The CFD model predictions revealed that the distributor with the largest number of orifices resulted in the least liquid maldistribution in the absorber, which led to increasing the overall CO2 absorption efficiency in Selexol as a physical solvent. Also, the overall CO2 absorption efficiency decreased with increasing the superficial liquid velocity due to the shorter contact times between CO2 and Selexol in the absorber at higher superficial liquid velocities.

Spherical SrCO3 Nanopowder Synthesized by Super Gravity Method

2014 ◽  
Vol 989-994 ◽  
pp. 280-283
Author(s):  
Zhan Shou Yang ◽  
Jian Hua Jin ◽  
Bo Li ◽  
Xin Wu Zou Qi ◽  
You Zhi Gang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Material Flow ◽  
Packed Bed ◽  
Tetraacetic Acid ◽  
Powder Morphology ◽  
Gravity Method ◽  
X Ray ◽  
Rotating Packed Bed ◽  
Scanning Electron

SrCO3 were synthesized using Sr (OH)2 solution and CO2 in super gravity reactor of carbide. It studied SrCO3 powder morphology by the dosage of the appearance agent Ethylene Diamine Tetraacetic Acid (EDTA), material flow and flow velocity and the speed of the rotating packed bed. Samples were characterized using X-ray powder diffraction (XRD) and scanning electron microscope (SEM). These products were found to be orthorhombic SrCO3 nanoparticles with 90–110 nm ranges.

Flow patterns, liquid holdup, and wetting behavior of viscous liquids in a disk-distributor rotating packed bed

2021 ◽  
pp. 117256
Author(s):  
Yan-Bin Li ◽  
Zhang-Nan Wen ◽  
Bao-Chang Sun ◽  
Yong Luo ◽  
Ke-Jing Gao ◽  
...  
Keyword(s):  
Packed Bed ◽  
Flow Patterns ◽  
Liquid Holdup ◽  
Viscous Liquids ◽  
Wetting Behavior ◽  
Rotating Packed Bed
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