Effects of Catalyst Amount, Membrane Tube Diameter and Permeation Rate on the Performance of Porous Membrane Reactors.

2001 ◽  
Vol 34 (11) ◽  
pp. 1332-1340 ◽  
Author(s):  
AZIS TRIANTO ◽  
TAKAO KOKUGAN
Keyword(s):  
Porous Membrane ◽  
Permeation Rate ◽  
Tube Diameter ◽  
Membrane Reactors ◽  
Catalyst Amount ◽  
Membrane Tube

Membrane-Assisted Reactor Engineering

2001 ◽  
Author(s):  
L. K. Doraiswamy
Keyword(s):  
Plug Flow ◽  
Operating Mode ◽  
Shape Selectivity ◽  
Membrane Reactors ◽  
Inorganic Membrane ◽  
Main Concern ◽  
Inorganic Membranes ◽  
Flow Reactors ◽  
Reactor Material ◽  
Membrane Tube

Like zeolites that combine shape selectivity with catalysis, membranes combine separation with catalysis to enhance reaction rates. The dual functionality of zeolites derives from the nature of the catalytic material, whereas that of membranes derives from the nature of the reactor material. The catalyst in the membrane reactor can be a part of the membrane itself or be external to it (i.e., placed inside the membrane tube). The chief property of a membrane is its ability for selective permeation or permselectivity with respect to certain compounds. Organic membrane reactions are best carried out in reactors made of inorganic membranes, such as from palladium, alumina, or ceramics. Good descriptions of these reactions and the membranes used are available in many reviews, for example, Gryaznov (1986, 1992), Stoukides (1988), Armor (1989), Govind and Ilias (1989), Bhave (1991), Zaspalis and Burggraaf (1991), Hsieh (1989, 1991), Shu et al. (1991), Shieh (1991), Gellings and Bouwmeister (1992), Tsotsis et al. (1993b), Harold et al. (1994), Saracco and Specchia (1994), Sanchez and Tsotsis (1996). A recent trend has been to develop polymeric-inorganic composite type membranes formed by the deposition of a thin dense polymeric film on an inorganic support (Kita et al., 1987; Rezac and Koros, 1994, 1995; Zhu et al., 1996). Another class of membranes under development for organic synthesis is the liquid membrane (Marr and Kopp, 1982; Eyal and Bressler, 1993). The permselective barrier in this type of membrane is a liquid phase, often containing a dissolved “carrier” or “transporter” that selectively reacts with a specific permeate to enhance its transport rate through the membrane. Our main concern in this chapter will be with inorganic membrane reactors. We commence our treatment with an introduction to the exploitable features of membrane reactors (with no attempt to describe membrane synthesis). Then we describe the main variations in design and operating mode of these reactors, develop performance equations for the more important designs, and compare the performances of some important designs with those of the traditional mixed- and plug-flow reactors. Finally, we present a summary of the applications of membrane reactors in enhancing the rates of organic reactions.

scholarly journals Modeling of ethylbenzene dehydrogenation in catalytic membrane reactor with porous membrane

2014 ◽  
Vol 2 (1) ◽  
pp. 1-9 ◽  
Author(s):  
E.V. Shelepova ◽  
A.A. Vedyagin ◽  
I.V. Mishakov ◽  
A.S. Noskov
Keyword(s):  
Mathematical Model ◽  
Membrane Reactor ◽  
Ceramic Membrane ◽  
Porous Ceramic ◽  
Porous Membrane ◽  
Membrane Reactors ◽  
Catalytic Membrane ◽  
Catalytic Membrane Reactor ◽  
Membrane Pore ◽  
Ethylbenzene Dehydrogenation

AbstractThe modeling of ethylbenzene dehydrogenation in a catalytic membrane reactor has been carried out for porous membrane by means of two-dimensional, non-isothermal stationary mathematical model. A mathematical model of the catalytic membrane reactor was applied, in order to study the effects of transport properties of the porous membrane on process performance. The performed modeling of the heat and mass transfer processes within the porous membrane, allowed us to estimate the efficiency of its use in membrane reactors, in comparison with a dense membrane (with additional oxidation of the hydrogen in shell side). The use of a porous ceramic membrane was found to cause an increase of the ethylbenzene conversion at 600°C, up to 93 %, while the conversion in the case of conventional reactor was 67%. In this work, we defined the key parameter values of porous membrane (pore diameter and thickness) for ethylbenzene dehydrogenation in catalytic membrane reactor, at which the highest conversion of ethylbenzene and styrene selectivity can be reached.

scholarly journals Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 128 ◽  
Author(s):  
Alba Arratibel Plazaola ◽  
Aitor Cruellas Labella ◽  
Yuliang Liu ◽  
Nerea Badiola Porras ◽  
David Pacheco Tanaka ◽  
...  
Keyword(s):  
Production Systems ◽  
Oxygen Permeation ◽  
Permeation Rate ◽  
Membrane Reactors ◽  
Pure Oxygen ◽  
Dual Phase ◽  
Significant Progress ◽  
Chemical Production ◽  
Perovskite Materials ◽  
Conducting Membranes

Mixed ionic-electronic conducting membranes have seen significant progress over the last 25 years as efficient ways to obtain oxygen separation from air and for their integration in chemical production systems where pure oxygen in small amounts is needed. Perovskite materials are the most employed materials for membrane preparation. However, they have poor phase stability and are prone to poisoning when subjected to CO2 and SO2, which limits their industrial application. To solve this, the so-called dual-phase membranes are attracting greater attention. In this review, recent advances on self-supported and supported oxygen membranes and factors that affect the oxygen permeation and membrane stability are presented. Possible ways for further improvements that can be pursued to increase the oxygen permeation rate are also indicated. Lastly, an overview of the most relevant examples of membrane reactors in which oxygen membranes have been integrated are provided.

scholarly journals Experimental Investigation of the Oxidative Coupling of Methane in a Porous Membrane Reactor: Relevance of Back-Permeation

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 152 ◽  
Author(s):  
Aitor Cruellas ◽  
Wout Ververs ◽  
Martin van Sint Annaland ◽  
Fausto Gallucci
Keyword(s):  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Effective Diffusion ◽  
Packed Bed ◽  
Porous Membrane ◽  
Oxidative Coupling Of Methane ◽  
Membrane Reactors ◽  
Packed Bed Reactor ◽  
Membrane Properties ◽  
Beneficial Effects

Novel reactor configurations for the oxidative coupling of methane (OCM), and in particular membrane reactors, contribute toward reaching the yield required to make the process competitive at the industrial scale. Therefore, in this work, the conventional OCM packed bed reactor using a Mn-Na2WO4/SiO2 catalyst was experimentally compared with a membrane reactor, in which a symmetric MgO porous membrane was integrated. The beneficial effects of distributive feeding of oxygen along the membrane, which is the main advantage of the porous membrane reactor, were demonstrated, although no significant differences in terms of performance were observed because of the adverse effects of back-permeation prevailing in the experiments. A sensitivity analysis carried out on the effective diffusion coefficient also indicated the necessity of properly tuning the membrane properties to achieve the expected promising results, highlighting how this tuning could be addressed.

Modelling of the Membrane Permeability Effect on the H2 Production Using CFD Method

2014 ◽  
Vol 12 (1) ◽  
pp. 333-344 ◽  
Author(s):  
Yacine Benguerba ◽  
Christine Dumas ◽  
Barbara Ernst
Keyword(s):  
Three Dimensional ◽  
Porous Membrane ◽  
H2 Production ◽  
Operating Conditions ◽  
Membrane Reactors ◽  
Production Of Hydrogen ◽  
Different Temperatures ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
Supported Ni

Abstract Autothermal reforming of CH4 in a membrane catalytic microreactor for the production of hydrogen at different temperatures over supported Ni catalysts has been studied. A three-dimensional mathematical model was developed using a computational fluid dynamics (CFD) technique. The effect of using different membranes on the performance of the micro-reactor was analysed. The amounts of hydrogen produced and separated in each case, under the same operating conditions, were compared. It was proven that using the porous membrane (Ni–Al2O3) could be an economic solution for the production and separation of hydrogen in membrane reactors.

Limited proteolysis in porous membrane reactors containing immobilized trypsin

The Analyst ◽  
2017 ◽  
Vol 142 (14) ◽  
pp. 2578-2586 ◽  
Author(s):  
Jinlan Dong ◽  
Wenjing Ning ◽  
Weijing Liu ◽  
Merlin L. Bruening
Keyword(s):  
Protein Structures ◽  
Limited Proteolysis ◽  
Porous Membrane ◽  
Membrane Reactors ◽  
Immobilized Trypsin ◽  
Limited Digestion

Trypsin-containing membranes effect limited digestion to identify facile digestion sites in protein structures.

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