Process intensification using multifunctional reactors

Dautzenberg, Frits M.; Mukherjee, Malini

doi:10.1016/s0009-2509(00)00228-1

Cited by 213 publications

(86 citation statements)

References 8 publications

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“…Dautzenberg, ABB Lumus provides us with many industrial examples [18]. For multi-functional reactors however no generic industrially applied conceptual design method is yet available [3].…”

Section: Conceptual Process Design By Function-integrationmentioning

confidence: 99%

Industrial best practices of conceptual process design

Harmsen

2004

Chemical Engineering and Processing: Process Intensification

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The chemical process industry aims particularly at energy, capital expenditure and variable feedstock cost savings due to fierce global competition, the Kyoto Protocol and requirements for sustainable development.Increasingly conceptual process design methods are used in the industry to achieve these aims. They are used in:• existing processes to renew parts;• process re-designs based on existing feedstocks and catalysts;• innovative processes (new feed stocks, new catalysts, new process routes, new multifunctional equipment).This article is focused on the best industrial conceptual design practices applied for these application areas. To this end we have reviewed methods, which are used in the chemical process industry in the last 15 years. Capital, energy and variable cost savings are indicated for each method.Specific attention is paid to:• functional integration to multi-functional equipment;• heuristic based selection of unit operations and recycle structure;• superstructure based design optimisation with mixed-integer-non-linear programming (MINLP).

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“…Dautzenberg, ABB Lumus provides us with many industrial examples [18]. For multi-functional reactors however no generic industrially applied conceptual design method is yet available [3].…”

Section: Conceptual Process Design By Function-integrationmentioning

confidence: 99%

Industrial best practices of conceptual process design

Harmsen

2004

Chemical Engineering and Processing: Process Intensification

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“…Use of smaller particles relative to the microchannel size also improves bed structure homogeneity as well as reduce 'wall effects' (Aggarwal et al, 2012), which lead to the fluid preferentially channelling along the walls rather than passing through the bed. However, as pressure drop and, therefore, pumping power tends to increase as the particle size drops (Unger et al, 2008, Dautzenberg and Mukherjee, 2001, DeStefano et al, 2008, a trade-off in the particle-tomicrochannel size must be accepted. In order to assess this trade-off as well as other issues related to the structure of the µPBs, a capacity to gain detailed understanding of the bed structure as a function of the particle characteristics and preparation conditions would be useful.…”

Section: Introductionmentioning

confidence: 99%

A new method for reconstruction of the structure of micro-packed beds of spherical particles from desktop X-ray microtomography images. Part A. Initial structure generation and porosity determination

Kashani

Živković

Elekaei

et al. 2016

Chemical Engineering Science

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Citation: NAVVAB KASHANI, M. ...et al., 2016. A new method for reconstruction of the structure of micro-packed beds of spherical particles from desktop X-ray microtomography images. Part A. Initial structure generation and porosity determination. Chemical Engineering Science, 146, Additional Information:• This paper was accepted for publication in the journal Chemical En- AbstractMicro-packed beds (µPBs) are seeing increasing use in the process intensification context (e.g. micro-reactors), in separation and purification, particularly in the pharmaceutical and bio-products sectors, and in analytical chemistry. The structure of the stationary phase and of the void space it defines in such columns is of interest because it strongly influences performance. However, instrumental limitations -in particular the limited resolution of various imaging techniques relative to the particle and void space dimensions -have impeded experimental study of the structure of µPBs. We report here a new method that obviates this issue when the µPBs are composed of particles that may be approximated by monodisperse spheres. It achieves this by identifying in successive cross-sectional images of the bed the approximate centre and diameter of the particle cross-sections, replacing them with circles, and then assembling them to form the particles by identifying correlations between the successive images. Two important novel aspects of the method proposed here are it does not require specification of a threshold for binarizing the images, and it preserves the underlying spherical geometry of the packing. The new method is demonstrated through its application to a packing of a near-monodispersed 30.5 µm particles of high sphericity within a 200 µm square cross-section column imaged using a machine capable of 2.28 µm resolution. The porosity obtained was, within statistical uncertainty, the same as that determined via a direct method whilst use of a commonly used automatic thresholding technique yielded a result that was nearly 10% adrift, well beyond the experimental uncertainty. Extension of the method to packings of spherical particles that are less monodisperse or of different regular shapes (e.g. ellipsoids) is also discussed.

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“…[1][2][3] An important application has been found in gas separation methods. Since polymeric membranes have been commercially produced since the 1980s, membrane separation shows a bright prospect to displace traditional separation processes (such as adsorption and distillation) because membrane separation is more economically competitive.…”

Section: Introductionmentioning

confidence: 99%

“…), l is the thickness of the membranes, P f is the pressure of the feed side (Pa), P p,0 is the initial pressure at the permeate side (Pa), P p,t is the transient pressure measured in the permeate volume (Pa), V p (m 3 ) is the constant permeate reservoir volume (51 cm 2 ), A is the permeable membrane area (m 2 ), R is the ideal gas constant (J mol 21 K…”

mentioning

confidence: 99%

Enhanced hydrogen separation by vertically-aligned carbon nanotube membranes with zeolite imidazolate frameworks as a selective layer

Hou

et al. 2012

RSC Adv.

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Vertically-aligned carbon nanotube (VACNT) membranes show very high permeation fluxes due to the inherent smooth and frictionless nature of the interior of the nanotubes. However, the hydrogen selectivities are all in the Knudsen range and are quite low. In this study we grew molecular sieve zeolite imidazolate frameworks (ZIFs) via secondary seeded growth on the VACNT membranes as a gas selective layer. The ZIF layer has a thickness of 5-6 mm and shows good contact with the VACNT membrane surface. The VACNT supported ZIF membrane shows much higher H 2 selectivity than Ar (7.0); O 2 (13.6); N 2 (15.1) and CH 4 (9.8). We conclude that tailoring metal-organic frameworks on the membrane surface can be an effective route to improve the gas separation performance of the VACNT membrane.

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Process intensification using multifunctional reactors

Cited by 213 publications

References 8 publications

Industrial best practices of conceptual process design

Industrial best practices of conceptual process design

A new method for reconstruction of the structure of micro-packed beds of spherical particles from desktop X-ray microtomography images. Part A. Initial structure generation and porosity determination

Enhanced hydrogen separation by vertically-aligned carbon nanotube membranes with zeolite imidazolate frameworks as a selective layer

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