scholarly journals Polymerization of Isobutylene in a Rotating Packed Bed Reactor: Experimental and Modeling Studies

2021 ◽  
Vol 11 (21) ◽  
pp. 10194
Author(s):  
Wenhui Hou ◽  
Wei Wang ◽  
Yang Xiang ◽  
Yingjiao Li ◽  
Guangwen Chu ◽  
...  
Keyword(s):  
Strong Dependence ◽  
Average Molecular Weight ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Mixing Efficiency ◽  
Polymerization Temperature ◽  
Analysis Method ◽  
Rotating Speed ◽  
Rotating Packed Bed ◽  
The Given

Polymerization of isobutylene (IB) for synthesizing highly reactive polyisobutylene (HRPIB) is characterized by a complicated fast intrinsic reaction rate; therefore, the features of its products exhibit a strong dependence on mixing efficiency. To provide uniform and efficient mixing, a rotating packed bed was employed as a reactor for polymerization of IB. The effects of operating parameters including polymerization temperature (T), rotating speed (N) and relative dosage of monomers and initiating systems ([M]0/[I]0) on number-average molecular weight (Mn) of HRPIB were studied. HRPIB with Mn of 2550 g·mol−1 and exo-olefin terminal content of 85 mol% were efficiently obtained at suitable conditions as T of 283 K, N of 1600 rpm and [M]0/[I]0 of 49. Moreover, the Mn can be regulated by changing T, N and [M]0/[I]0. Based on the presumptive-steady-state analysis method and the coalescence–redispersion model, a model for prediction of the Mn was developed and validated, and the calculated Mn values agreed well with experimental results, with a deviation of ±10%. The results demonstrate that RPB is a promising reactor for synthesizing HRPIB, and the given model for Mn can be applied for the design of RPB and process optimization.

Rotating packed bed reactor for enzymatic synthesis of biodiesel

2017 ◽  
Vol 224 ◽  
pp. 292-297 ◽  
Author(s):  
Juntao Xu ◽  
Changsheng Liu ◽  
Meng Wang ◽  
Lei Shao ◽  
Li Deng ◽  
...  
Keyword(s):  
Enzymatic Synthesis ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Rotating Packed Bed

Synthesis of nano-fibers of aluminum hydroxide in novel rotating packed bed reactor

2003 ◽  
Vol 58 (3-6) ◽  
pp. 569-575 ◽  
Author(s):  
Jian-Feng Chen ◽  
Lei Shao ◽  
Fen Guo ◽  
Xing-Ming Wang
Keyword(s):  
Aluminum Hydroxide ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Rotating Packed Bed

scholarly journals Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 724
Author(s):  
Wang ◽  
Wu ◽  
Yang ◽  
Wang ◽  
Liu ◽  
...  
Keyword(s):  
Residence Time ◽  
Droplet Diameter ◽  
Packed Bed ◽  
Droplet Velocity ◽  
Radial Position ◽  
Selective Absorption ◽  
Rotating Speed ◽  
Initial Droplet ◽  
Rotating Packed Bed ◽  
Computational Fluid Dynamics Analysis

Rotating packed bed (RPB) has been demonstrated as a significant and emerging technology to be applied in natural gas desulfurization. However, droplet characteristics and principle in H2S selective absorption with N-methyldiethanolamine (MDEA) solution have seldom been fully investigated by experimental method. Therefore, a 3D Eulerian–Lagrangian approach has been established to investigate the droplet characteristics. The discrete phase model (DPM) is implemented to track the behavior of droplets, meanwhile the collision model and breakup model are employed to describe the coalescence and breakup of droplets. The simulation results indicate that rotating speed and radial position have a dominant impact on droplet velocity, average residence time and average diameter rather than initial droplet velocity. A short residence time of 0.039–0.085 s is credited in this study for faster mass transfer and reaction rate in RPB. The average droplet diameter decreases when the initial droplet velocity and rotating speed enhances. Restriction of minimum droplet diameter for it to be broken and an appropriate rotating speed have also been elaborated. Additional correlations on droplet velocity and diameter have been obtained mainly considering the rotating speed and radial position in RPB. This proposed formula leads to a much better understanding of droplet characteristics in RPB.

Ultrafast Synthesis of Silver Nanoparticle Decorated Graphene Oxide by a Rotating Packed Bed Reactor

2016 ◽  
Vol 55 (44) ◽  
pp. 11622-11630 ◽  
Author(s):  
Xing-Wei Han ◽  
Xiang-Zhen Meng ◽  
Jie Zhang ◽  
Jie-Xin Wang ◽  
Hai-Feng Huang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Silver Nanoparticle ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Rotating Packed Bed

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.

Cationic polymerization in rotating packed bed reactor: Experimental and modeling

AIChE Journal ◽  
2009 ◽  
pp. NA-NA ◽  
Author(s):  
Jian-Feng Chen ◽  
Hua Gao ◽  
Hai-Kui Zou ◽  
Guang-Wen Chu ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Cationic Polymerization ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Rotating Packed Bed

scholarly journals Synthesis of Silver Sulfide Quantum Dots Via the Liquid–Liquid Interface Reaction in a Rotating Packed Bed Reactor

2019 ◽  
Vol 26 (4) ◽  
pp. 273-282 ◽  
Author(s):  
Qing Liu ◽  
Yuan Pu ◽  
Zhijian Zhao ◽  
Jiexin Wang ◽  
Dan Wang
Keyword(s):  
Quantum Dots ◽  
Scale Up ◽  
Interface Reaction ◽  
Packed Bed ◽  
Silver Sulfide ◽  
Liquid Interface ◽  
Packed Bed Reactor ◽  
Dynamics Simulation ◽  
Rotating Packed Bed ◽  
Nir Luminescence

AbstractWe developed the high-gravity coupled liquid–liquid interface reaction technique on the basis of the rotating packed bed (RPB) reactor for the continuous and ultrafast synthesis of silver sulfide (Ag2S) quantum dots (QDs) with near-infrared (NIR) luminescence. The formation of Ag2S QDs occurs at the interface of microdroplets, and the average size of Ag2S QDs was 4.5 nm with a narrow size distribution. Ag2S QDs can disperse well in various organic solvents and exhibit NIR luminescence with a peak wavelength at 1270 nm under 980-nm laser excitation. The mechanism of the process intensification was revealed by both the computational fluid dynamics simulation and fluorescence imaging, and the mechanism is attributed to the small and uniform droplet formation in the RPB reactor. This study provides a novel approach for the continuous and ultrafast synthesis of NIR Ag2S QDs for potential scale-up.

scholarly journals Continuous Carbonation for Synthesis of Pseudo-Boehmite by Using Cross-Flow Rotating Packed Bed through the Reaction of NaAlO2 Solution with CO2 Gas

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 263 ◽  
Author(s):  
Xiaojing Ren ◽  
Youzhi Liu ◽  
Longxin Miao
Keyword(s):  
Electron Microscopy ◽  
Cross Flow ◽  
Packed Bed ◽  
High Specific Surface Area ◽  
Liquid Ratio ◽  
Co2 Gas ◽  
Rotating Speed ◽  
Full Contact ◽  
Rotating Packed Bed ◽  
Bet Analysis

This research established a novel method for the preparation of pseudo-boehmite (PB) via a continuous carbonation of CO2 gas and a NaAlO2 solution in a cross-flow rotating packed bed (CF-RPB). In the CF-RPB, the NaAlO2 solution can be sheared into fine liquid filaments and droplets, and react in full contact with the CO2 gas. Effects of synthesis parameters, including the concentration of the NaAlO2 solution, the gas–liquid ratio, the rotating speed of the CF-RPB, and the final pH of the solution on the crystal structure of PB, were fully investigated. A series of characterizations, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) analysis, were carried out to explain the evaluation results and to find the relationship between PB properties and the synthetic conditions. The results showed that PB with a high specific surface area (495 m2/g) and large pore volume (2.125 cc/g) can be obtained when the concentration of the NaAlO2 solution was 0.1 mol/L, the gas–liquid ratio was 3:1, the rotating speed of RPB was 600 rpm, and the final pH was around 10.5. PB obtained by this method had a higher quality compared with that using a stirred tank reactor. Moreover, the continuous carbonation can be efficiently batch-produced, which provided a new idea for an industrial application.

Flow behavior in a rotating packed bed reactor with single-layer mesh: Effect of fiber cross-sectional shape

2021 ◽  
pp. 117147
Author(s):  
Zhang-Nan Wen ◽  
Yan-Bin Li ◽  
Wei Liu ◽  
Yong Luo ◽  
Liang-Liang Zhang ◽  
...  
Keyword(s):  
Flow Behavior ◽  
Single Layer ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Cross Sectional ◽  
Rotating Packed Bed ◽  
Sectional Shape
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