The concept of selectivity control by simultaneous distribution of the oxygen feed and wall temperature in a microstructured reactor

Aworinde, Samson M.; Schweidtmann, Artur M.; Lapkin, Alexei

doi:10.1016/j.cej.2017.09.030

Cited by 6 publications

(6 citation statements)

References 49 publications

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“…Clearly, the likelihood of hotspot generation or runaway reactions taking place in the VTMR is significantly reduced through the modulation of O2 permeation. Equivalent observations were reported in studies of similar reactor concepts for the autothermal reforming of methane [21] and the selective oxidation of o-xylene to phthalic anhydride [2]. A maximum temperature difference of about 200 K is observed between the two configurations for the simulated conditions at the end of the reactor.…”

Section: Non-isothermal Performancesupporting

confidence: 54%

“…Ethylene production via the single step Oxidative Coupling of Methane (OCM) is a promising and less energy intensive process, which can also break the crude oil dependency. However, OCM is characterized by a trade-off between achieving high (low) C2 selectivity at conditions where CH4 conversion is low (high), resulting in non-economical C2 yields [2]. Since the pioneering work of Keller and Bhasin [3] and despite extensive research in OCM catalysis, only the recently developed nanowire catalysts by Siluria Technologies have managed to bring closer the commercial realization of OCM [4,5].…”

Section: Accepted M M a N U mentioning

confidence: 99%

“…The use of distributed or staged O2 feeding has also been considered for other processes, such as autothermal steam reforming of methane [19][20][21][22], although primarily aiming at optimal temperature control. Aworinde et al [2] further showed selectivity improvements via the simultaneous modulation of O2 and coolant temperature for the preferential oxidation of o-xylene to phthalic anhydride.…”

Section: Accepted M M a N U mentioning

confidence: 99%

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Influencing selectivity in the oxidative coupling of methane by modulating oxygen permeation in a variable thickness membrane reactor

Onoja

Wang

Kechagiopoulos

2019

Chemical Engineering and Processing - Process Intensification

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The Oxidative Coupling of Methane (OCM) has been considered for years as a promising alternative for the production of higher hydrocarbons, namely ethane and ethylene. Nonetheless, OCM's inherent conversion-versus-selectivity limitations have not allowed till now for economical C2 yields to be achieved. Reactor engineering studies guided by a detailed mechanistic description of the reaction can directly contribute to obtaining an understanding of these limitations. In this work, a Variable Thickness Membrane Reactor (VTMR) is proposed, wherein O2 permeation along the reactor is modulated, aiming at maximizing C2 selectivity. 1D and 2D reactor simulations are carried out to compare the performance of this reactor to conventional co-feed Packed Bed Reactors (PBR) and Membrane Reactors without variable thickness (MR). Particular attention is given on the impact of gas phase reactions on C2 selectivity, while the effect of surface exchange kinetics on both sides of the membrane and bulk diffusion of O2 across the membrane is discriminated. When identical operating conditions (T = 1073 K, P = 1 atm, Space time = 7.85 s) and reactor geometry (Length = 0.1 m, Diameter = 0.01 m) were evaluated, the optimization performed of the VTMR configuration achieved a C2 selectivity of 67.26 %, in comparison to 47.86 % and 29.87 % for the MR and PBR, respectively, highlighting the potential of the concept.

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Section: Non-isothermal Performancesupporting

confidence: 54%

Section: Accepted M M a N U mentioning

confidence: 99%

Section: Accepted M M a N U mentioning

confidence: 99%

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Influencing selectivity in the oxidative coupling of methane by modulating oxygen permeation in a variable thickness membrane reactor

Onoja

Wang

Kechagiopoulos

2019

Chemical Engineering and Processing - Process Intensification

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“…If anilines meet alkyl halides in the conventional reactors, no alkyl halides will exist in the reaction system, affording monoalkylated aniline with low selectivity. Certain amounts of dialkylated and trialkylated anilines were present . Therefore, the N -monoalkylation of anilines based on a novel reaction technology with high mixing efficiency is in urgent need of research.…”

Section: Introductionmentioning

confidence: 94%

Interdigital Micromixer for Selective N-Monoalkylation of Anilines in a Microflow System

Zhang

Zhao

Fang

et al. 2022

Ind. Eng. Chem. Res.

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An interdigital micromixer was designed and used in the N-monoalkylation of anilines with alkyl halides. The optimization of the interdigital micromixer was conducted through computational fluid dynamics (CFD). The mixing performance and flow field of this novel micromixer were investigated in detail. The introduction of the interdigital micromixer promoted the mass transfer between anilines and alkyl halides, affording the corresponding N-monoalkylated anilines with a selectivity of 93% and a yield of 89%. No other bases and catalysts were used in this process. The interdigital micromixer had 13% higher selectivity than that of the commercial Y-type micromixer and 30% higher selectivity than that of the batch method. Furthermore, the universality experiments of this N-monoalkylation process proved that the micromixer had a better broad applicability. All the findings reported provided useful references for the improvement of selectivity and yield of the chemical reaction in microflow systems.

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“…[10][11][12][13][14] Esterification of methacrylic acid (MAA) from light hydrocarbons (ethylene, propylene, and isobutane) to MMA is a promising approach to supplant current ACH technology with an option with a lower environmental impact. [1,[15][16][17][18][19][20] Ethylene and carbon monoxide react in the presence of water to form propionaldehyde, propionic acid, methyl propionate, and methacrolein (MAC) as intermediates. Multiple steps, high investment costs, and intermediates are obstacles to commercialization.…”

Section: Introductionmentioning

confidence: 99%

Oxidation kinetics of 2‐methyl‐1,3‐propanediol to methacrylic acid in a fluidized bed reactor

et al. 2020

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Methacrylic acid (MAA) is a specialty monomer for poly methyl methacrylate (PMMA). Partial oxidation of 2‐methyl‐1,3‐propanediol (2MDPO) to MAA is an alternative to commercial technology with fewer process steps, less cost and toxic feedstocks, and longer catalyst lifetime. Here, we evaluated the effect of 2MPDO and oxygen concentrations, reaction temperature, and contact time on product selectivity and 2MPDO conversion over VOCu0.5/Cs(NH4)2PMo12O40. Higher temperature increases selectivity and conversion; MAA selectivity reached 46% at 69% 2MPDO conversion. Higher 2MPDO to O2 ratio favours higher MAA selectivity due to methacrolein (intermediate) oxidation to MAA (a higher ratio favours consecutive oxidation) or lower combustion of MAA to COx. Shorter contact times decrease MAA selectivity. The Mars van Krevelen model characterizes the experimental data better than both the Langmuir‐Hinshelwood or Eley‐Rideal models; The reaction sequence involves both direct and indirect reactions in which 2MPDO reacts to methacrolein (MAC) as an intermediate and then it oxidizes to MAA (indirect) and/or 2MPDO directly oxidizes to MAA but the indirect reaction rate to MAA is 50 times faster than the direct reaction rate. The reaction is first order with respect 2MPDO and oxygen, and the rate‐limiting step is 2MPDO activation on oxidized sites.

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The concept of selectivity control by simultaneous distribution of the oxygen feed and wall temperature in a microstructured reactor

Cited by 6 publications

References 49 publications

Influencing selectivity in the oxidative coupling of methane by modulating oxygen permeation in a variable thickness membrane reactor

Influencing selectivity in the oxidative coupling of methane by modulating oxygen permeation in a variable thickness membrane reactor

Interdigital Micromixer for Selective N-Monoalkylation of Anilines in a Microflow System

Oxidation kinetics of 2‐methyl‐1,3‐propanediol to methacrylic acid in a fluidized bed reactor

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