Polymer hydrogenation in pulsed flow systems with extrusion

Bussard, Alan G.; Dooley, Kerry M.

doi:10.1002/aic.11448

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…In terms of improving the reaction system, pulsed flow reactor has been widely concerned by researchers because of its high mass and heat transfer rate and complete wetting of catalyst. 31 On this basis, Bussard et al 32 used the extrusion pulse reactor for PS hydrogenation, and the reaction process flow is shown in Figure 2. After the polymer solution and H 2 are premixed in the stirring tank, they enter the twin-screw extruder and react with the catalyst bed fixed in the extruder.…”

Section: Catalytic Hydrogenation Of Unsaturated Polymersmentioning

confidence: 99%

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Advances in the Catalytic Hydrogenation and Properties of Unsaturated Polymers

Yan

Cao

2023

Macromolecules

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Polymer reaction and performance improvement are one of the important contents in the field of polymer materials science and engineering, in which polymer catalytic hydrogenation is an important part of polymer reaction. We reviewed the research achievements on polymer hydrogenation over the past 70 years and studied the mechanism of the hydrogenation reaction from the aspects of performance changes before and after polymer hydrogenation, the catalyst preparation/structure−activity relationship, and polymer hydrogenation kinetics. We pointed out the difficulty in separation and unsatisfactory high-temperature adaptability of traditional homogeneous catalysts and first proposed four effects affecting traditional heterogeneous polymer hydrogenation: scale effect, conformation effect, viscosity effect, and adhesion effect. Based on the structure−activity relationship of polymers, we put forward the application direction of hydrogenated polymers at present. We found that using a new kind of nanometal catalyst (Pd/CNTs@FN) as hydrogenation catalyst can effectively reduce or eliminate the negative effects of these four effects on the polymer hydrogenation reaction, and it is easy to separate from the reaction system. The addition of CNTs can effectively increase the specific surface area of the catalyst and strengthen the interaction between reactants and catalyst. Subsequent research should focus on designing the multiscale structure and improving low-temperature activity of the catalyst, reducing process cost, and using green and efficient separation methods to eliminate adverse effects, create a green and efficient polymer reaction system, accelerate the industrialization of polymer hydrogenation process, and provide theoretical guidance for the research and development of new polymer materials.

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Section: Catalytic Hydrogenation Of Unsaturated Polymersmentioning

confidence: 99%

Section: Catalytic Hydrogenation Of Unsaturated Polymersmentioning

confidence: 99%

Advances in the Catalytic Hydrogenation and Properties of Unsaturated Polymers

Yan

Cao

2023

Macromolecules

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“…86 There are, however, few examples of heterogeneous catalysis, including polyethylene degradation over silica-alumina 87 and hydrogenation of poly(styrene) over a Pd/Al 2 O 3 catalyst. 88…”

Section: Catalytic Reactive Extrudersmentioning

confidence: 99%

Process Intensification and Catalysis

Boffito

Gerven

2019

Reference Module in Chemistry, Molecular Sciences and Chemical Engineering

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This article was published in the Elsevier Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, and the attached copy is provided by Elsevier for the author's benefit and for the benefit of the author's institution, for non-commercial research and educational use including without limitation use in instruction at your institution, sending it to specific colleagues who you know, and providing a copy to your institution's administrator.

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“…24 As three-phase reactors can suffer from rivulet formation and inhomogeneous residence time distributions in such cumbersome systems, here we also evaluate the influence of the liquid flow rate. The VOF model predictions of the normalized concentration profile following the ON-OFF liquid flow modulation (L ¼ 9 kg/m 2 s !…”

Section: Effect Of Liquid Flow Ratementioning

confidence: 99%

Numerical simulation of reactive pulsing flow for the catalytic wet oxidation in TBR using a VOF technique

2011

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Guided by the intrinsic advantages of the dynamic nature of mass/heat transfer fluctuations in pulsing flow, here we performed volume-of-fluid (VOF) numerical simulations to evaluate how liquid flow modulations can improve the detoxification of liquid effluents by catalytic wet oxidation. First, prominent numerical parameters were optimized in terms of mesh aperture and time step. Second, the effect of oxidation temperature and the influence of gas and liquid flow rates have been investigated comparatively under different flow regimes. The VOF computations have correctly handled the experimental observations both in terms of the axial conversion and temperature. The increase of oxidation temperature was found to move the trickling and pulsing intersection point on the conversion toward the top of the trickle bed. Finally, in comparison with trickling flow regimes, these computed and experimental findings revealed a considerable improvement on the detoxification of organic matter highlighting the benefits of process intensification covered by the periodic liquid flow modulations.

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Polymer hydrogenation in pulsed flow systems with extrusion

Cited by 7 publications

References 35 publications

Advances in the Catalytic Hydrogenation and Properties of Unsaturated Polymers

Advances in the Catalytic Hydrogenation and Properties of Unsaturated Polymers

Process Intensification and Catalysis

Numerical simulation of reactive pulsing flow for the catalytic wet oxidation in TBR using a VOF technique

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