Tube-In-Tube Reactor as a Useful Tool for Homo- and Heterogeneous Olefin Metathesis under Continuous Flow Mode

ChemSusChem ◽  
2013 ◽  
Vol 7 (2) ◽  
pp. 536-542 ◽  
Author(s):  
Krzysztof Skowerski ◽  
Stefan J. Czarnocki ◽  
Paweł Knapkiewicz
Keyword(s):  
Olefin Metathesis ◽  
Continuous Flow ◽  
Flow Mode ◽  
Tube Reactor

Olefin Metathesis Under Continuous Flow Mode

2013 ◽  
Vol 17 (22) ◽  
pp. 2740-2748 ◽  
Author(s):  
Krzysztof Skowerski ◽  
Celina Wierzbicka ◽  
Karol Grela
Keyword(s):  
Olefin Metathesis ◽  
Continuous Flow ◽  
Flow Mode

Size controlled synthesis of semiconductor nanocrystals in a continuous-flow mode microcapillary reactor

2009 ◽  
Vol 52 (1-3) ◽  
pp. 15-18 ◽  
Author(s):  
L. B. He ◽  
B. Xie ◽  
F. Q. Song ◽  
C. H. Xu ◽  
J. F. Zhou ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Semiconductor Nanocrystals ◽  
Flow Mode ◽  
Controlled Synthesis ◽  
Size Controlled

Use of iron ore tailing from tailing dam as catalyst in a fenton-like process for methylene blue oxidation in continuous flow mode

Chemosphere ◽  
2019 ◽  
Vol 219 ◽  
pp. 328-334 ◽  
Author(s):  
Victor Augusto Araújo de Freitas ◽  
Samuel Moura Breder ◽  
Flávia Paulucci Cianga Silvas ◽  
Patrícia Radino Rouse ◽  
Luiz Carlos Alves de Oliveira
Keyword(s):  
Methylene Blue ◽  
Continuous Flow ◽  
Iron Ore ◽  
Flow Mode ◽  
Tailing Dam ◽  
Iron Ore Tailing

Different Types of Microbial Fuel Cell (MFC) Systems for Simultaneous Electricity Generation and Pollutant Removal

2015 ◽  
Vol 74 (3) ◽  
Author(s):  
S. M. Zain ◽  
N. L. Ching ◽  
S. Jusoh ◽  
S. Y. Yunus
Keyword(s):  
Nitrogen Removal ◽  
Continuous Flow ◽  
Electricity Generation ◽  
Pollutant Removal ◽  
Flow Mode ◽  
Oxidizing Agent ◽  
Batch Mode ◽  
Carbon And Nitrogen ◽  
Different Types ◽  
The Relationship

The aim of this study is to identify the relationship between the rate of electricity generation and the rate of carbon and nitrogen removal from wastewater using different MFC processes.  Determining whether the generation of electricity using MFC process could be related to the rate of pollutant removal from wastewater is noteworthy. Three types of MFC process configurations include the batch mode (SS), a continuous flow of influent with ferricyanide (PF) as the oxidizing agent and a continuous flow of influent with oxygen (PU) as the oxidizing agent. The highest quantity of electricity generation was achieved using the continuous flow mode with ferricyanide (0.833 V), followed by the continuous flow mode with oxygen (0.589 V) and the batch mode (0.352 V). The highest efficiency of carbon removal is also achieved by the continuous flow mode with ferricyanide (87%), followed by the continuous flow mode with oxygen (51%) and the batch mode (46%). Moreover, the continuous flow mode with ferricyanide produced the highest efficiency for nitrogen removal (63%), followed by the continuous flow mode with oxygen (54%) and the batch mode (27%).

scholarly journals A Steady State Continuous Flow Chamber for the Study of Daytime and Night time Chemistry under Atmospherically Relevant NO levels

2018 ◽  
Author(s):  
Xuan Zhang ◽  
John Ortega ◽  
Yuanlong Huang ◽  
Stephen Shertz ◽  
Geoffrey S. Tyndall ◽  
...  
Keyword(s):  
Steady State ◽  
Atmospheric Chemistry ◽  
Continuous Flow ◽  
Anthropogenic Activities ◽  
The United States ◽  
Flow Chamber ◽  
Flow Mode ◽  
Peroxy Radicals ◽  
Night Time ◽  
Atmospheric Processes

Abstract. Experiments performed in laboratory chambers have contributed significantly to the understanding of the fundamental kinetics and mechanisms of the chemical reactions occurring in the atmosphere. Two chemical regimes, classified as high-NO versus zero-NO conditions, have been extensively studied in previous chamber experiments. Results derived from these two chemical scenarios are widely parameterized in chemical transport models to represent key atmospheric processes in urban and pristine environments. As the anthropogenic NOx emissions in the United States have decreased remarkably in the past few decades, the classic high-NO and zero-NO conditions are no longer applicable to many regions that are constantly impacted by both polluted and background air masses. We present here the development and characterization of the NCAR Atmospheric Simulation Chamber, which is operated in steady state continuous flow mode for the study of atmospheric chemistry under intermediate NO conditions. This particular chemical regime is characterized by constant sub-ppb levels of NO and can be created in the chamber by precise control of the inflow NO concentration and the ratio of chamber mixing to residence timescales. Over the range of conditions achievable in the chamber, the lifetime of peroxy radicals (RO2), a key intermediate from the atmospheric degradation of volatile organic compounds (VOCs), can be extended to several minutes, and a diverse array of reaction pathways, including unimolecular pathways and bimolecular reactions with NO and HO2, can thus be explored. Characterization experiments under photolytic and dark conditions were performed and, in conjunction with model predictions, provide a basis for interpretation of prevailing atmospheric processes in environments with intertwined biogenic and anthropogenic activities. We demonstrate the proof of concept of the steady state continuous flow chamber operation through measurements of major first-generation products, methacrolein (MACR) and methyl vinyl ketone (MVK), from OH- and NO3-initiated oxidation of isoprene.

Photocatalytic degradation of 2-propanol over TiO2-based thin films in a simulated pilot microreactor

2021 ◽  
Vol 02 ◽  
Author(s):  
Corrado Garlisi ◽  
Ahmed Yusuf ◽  
Giovanni Palmisano
Keyword(s):  
Thin Films ◽  
Gas Phase ◽  
Continuous Flow ◽  
Molecular Diffusion ◽  
Batch Reactor ◽  
High Surface ◽  
Operating Conditions ◽  
Flow Mode ◽  
Doped Tio2 ◽  
Kinetics Of

Background: Microreactor devices have attracted increasing attention over the last years due to their high surface-to-volume ratio which ensures a high heat and mass transfer, short molecular diffusion distance and greater spatial illumination homogeneity compared to traditional reactors. Objective: The aim of this study was to model the kinetics of photodegradation of 2-propanol over TiO2-based thin films in a gas-phase batch-reactor and simulate their performance in a microreactor device. Methods: The reaction was carried out in a gas-phase batch-reactor assessing the reactivity of a single-layer nitrogen (N)-doped TiO2 and a bilayer consisting of N-doped TiO2 as a bottom layer and copper (Cu)-doped TiO2 as a top layer. The kinetics of the photocatalytic process was modelled by Langmuir–Hinshelwood (LH) model. The constants obtained from LH model were used to simulate the performance of the photocatalysts in a microreactor operating in a continuous flow mode and investigating the effect of the volumetric flow rate (Q), initial concentration of pollutant (Co), number of microchannels (n) and microchannel length (l) on the photodegradation of 2-propanol. Results: N-Cu-TiO2 exhibited a higher reactivity but a lower to adsorption ability towards the target pollutant compared to N-TiO2. To maximize and leverage the advantages of microreactor, optimal operating conditions for a continuous flow mode, at steady state, should be moderately low Q and Co, long l and moderate n that minimizes flow maldistribution in parallel. Conclusion: The findings in this work could serve as a basis to design and fabricate efficient microreactors for the removal of VOC in air purification applications.

scholarly journals Imine Reductase Based All-Enzyme Hydrogel with Intrinsic Cofactor Regeneration for Flow Biocatalysis

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 783 ◽  
Author(s):  
Patrick Bitterwolf ◽  
Felix Ott ◽  
Kersten S. Rabe ◽  
Christof M. Niemeyer
Keyword(s):  
Continuous Flow ◽  
Viscoelastic Properties ◽  
Mesh Size ◽  
Binding Kinetics ◽  
Flow Mode ◽  
Efficient Manner ◽  
Flow Rates ◽  
Covalent Crosslinking ◽  
Flow Processes ◽  
Space Time Yield

All-enzyme hydrogels are biocatalytic materials, with which various enzymes can be immobilized in microreactors in a simple, mild, and efficient manner to be used for continuous flow processes. Here we present the construction and application of a cofactor regenerating hydrogel based on the imine reductase GF3546 from Streptomyces sp. combined with the cofactor regenerating glucose-1-dehydrogenase from Bacillus subtilis. The resulting hydrogel materials were characterized in terms of binding kinetics and viscoelastic properties. The materials were formed by rapid covalent crosslinking in less than 5 min, and they showed a typical mesh size of 67 ± 2 nm. The gels were applied for continuous flow biocatalysis. In a microfluidic reactor setup, the hydrogels showed excellent conversions of imines to amines for up to 40 h in continuous flow mode. Variation of flow rates led to a process where the gels showed a maximum space-time-yield of 150 g·(L·day)−1 at 100 μL/min.

scholarly journals Immobilized Whole-Cell Transaminase Biocatalysts for Continuous-Flow Kinetic Resolution of Amines

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 438 ◽  
Author(s):  
Zsófia Molnár ◽  
Emese Farkas ◽  
Ágnes Lakó ◽  
Balázs Erdélyi ◽  
Wolfgang Kroutil ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Kinetic Resolution ◽  
Sol Gel ◽  
Chiral Amines ◽  
Flow Mode ◽  
Immobilized Cell ◽  
Hollow Silica ◽  
E Coli ◽  
Sol Gel Process ◽  
Racemic Amines

Immobilization of transaminases creates promising biocatalysts for production of chiral amines in batch or continuous-flow mode reactions. E. coli cells containing overexpressed transaminases of various selectivities and hollow silica microspheres as supporting agent were immobilized by an improved sol-gel process to produce immobilized transaminase biocatalysts with suitable stability and mechanical properties for continuous-flow applications. The immobilized cell-based transaminase biocatalyst proved to be durable and easy-to-use in kinetic resolution of four racemic amines 1a–d. The batch and continuous-flow mode kinetic resolutions with transaminase biocatalyst of opposite stereopreference provided access to both enantiomers of the corresponding amines. By using the most suitable immobilized transaminase biocatalysts, this study describes the first transaminase-based approach for the production of both pure enantiomers of 1-(3,4-dimethoxyphenyl)ethan-1-amine 1d.

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