scholarly journals Precipitation of Nanosized and Nanostructured Powders: Process Intensification and Scale-Out Using a Segmented Flow Tubular Reactor (SFTR)

2010 ◽  
Vol 34 (3) ◽  
pp. 344-352 ◽  
Author(s):  
A. Aimable ◽  
N. Jongen ◽  
A. Testino ◽  
M. Donnet ◽  
J. Lemaître ◽  
...  
Keyword(s):  
Tubular Reactor ◽  
Process Intensification ◽  
Segmented Flow ◽  
Nanostructured Powders

scholarly journals Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

2021 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
Muhammad Yusuf Prajitno ◽  
Mohamad Taufiqurrakhman ◽  
David Harbottle ◽  
Timothy N. Hunter
Keyword(s):  
Adsorption Capacity ◽  
Tubular Reactor ◽  
Process Intensification ◽  
Kinetic Studies ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Batch Studies ◽  
Shear Mixing ◽  
Natural Clinoptilolite ◽  
Kinetics Of

Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.

scholarly journals Continuous Polyol Synthesis of Metal and Metal Oxide Nanoparticles Using a Segmented Flow Tubular Reactor (SFTR)

Molecules ◽  
2015 ◽  
Vol 20 (6) ◽  
pp. 10566-10581 ◽  
Author(s):  
Andrea Testino ◽  
Frank Pilger ◽  
Mattia Lucchini ◽  
Jose Quinsaat ◽  
Christoph Stähli ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Tubular Reactor ◽  
Polyol Synthesis ◽  
Oxide Nanoparticles ◽  
Segmented Flow

scholarly journals Intermediate Gas Feed in Bi- or Triphasic Gas–Liquid(–Liquid) Segmented Slug Flow Capillary Reactors

Symmetry ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2092
Author(s):  
Niclas von Vietinghoff ◽  
David Hellmann ◽  
Jan Priebe ◽  
David W. Agar
Keyword(s):  
Success Rate ◽  
Flow Pattern ◽  
Slug Flow ◽  
Flow Characteristics ◽  
Process Intensification ◽  
Gas Bubbles ◽  
Electrolysis Cell ◽  
Segmented Flow ◽  
Good Potential ◽  
Flow Capillary

Segmented slug flow systems in capillaries have already shown good potential for process intensification, due to their symmetry in the characteristic flow pattern. However, several challenges remain in this technology. For instance, in gas-consuming reactions, like Aliq + Bgas→Cliq, the gas droplets shrink and may even disappear, limiting the conversions and throughputs of capillary reactor systems. To overcome such shortcomings, an intermediate gas feed was developed. In order to maintain the well-defined slug flow characteristics, it is necessary to introduce the gas rapidly and precisely, in small aliquots of <10 µL. This allows us to preserve the well-defined alternating triphasic slug flow. A miniaturized electrolysis cell, together with a flow-observing system, was thus devised and implemented successfully as an intermediate gas feed. Feeding a new gas droplet into an existing liquid–liquid segmented flow had a success rate of up to 99%, whereas refilling an existing gas droplet is often limited by a lack of coalescence. Here, only at low volumetric flows, 70% of the gas bubbles were refilled by coalescence.

Modular Concept of a Smart Scale Helically Coiled Tubular Reactor for Continuous Operation of Multiphase Reaction Systems

2016 ◽  
Author(s):  
Safa Kutup Kurt ◽  
Mohd Akhtar ◽  
Krishna Deo Prasad Nigam ◽  
Norbert Kockmann
Keyword(s):  
Batch Reactor ◽  
Continuous Production ◽  
Tubular Reactor ◽  
Process Intensification ◽  
Tube Length ◽  
Precipitation Process ◽  
Flow Profile ◽  
Continuous Precipitation ◽  
Reaction Systems ◽  
Modular Concept

Process intensification (PI) via microstructured devices has often been applied by research and development (R&D) and industry for a decade, as they offer a large specific surface area that enhances the mass and the heat transfer. Helically coiled tubular reactors (HCTR) in micro-scale can further increase the performance in terms of transport phenomena, as the secondary flow (Dean vortices) enhances the radial mixing along the tube. Therefore, a narrow residence time distribution (RTD) that is required for the operation of complex chemical reaction systems can be achieved for the long residence times (RTs) at laminar flow regimes In this study, the continuous precipitation of calcium carbonate (CaCO3) was investigated by using a smart scale HCTR, i.e. modular coiled flow inverter (CFI) made of polyvinyl chloride (PVC) tubes (di = 3.2 mm). Modular CFI consists of 90° bends connecting the helical coils in order to enhance the radial mixing further. For precipitation process calcium hydroxide (Ca(OH)2) solution and gaseous CO2/synthetic air mixture were contacted prior to the reactor inlet via a Y-mixer. Slug flow profile was maintained and CaCO3 was precipitated along the reactor tube. To avoid further reaction of CaCO3 with water that is saturated with CO2 (pH ≲ 8.6), which promotes the consecutive parallel reaction forming soluble calcium bicarbonate (Ca(HCO3)2), the RT of the reactor was easily varied by changing the tube length of the modular CFI. Precipitated CaCO3 particles with a conversion of ca. 90% were separated from the suspension by vacuum filtration. Influence of volumetric flow ratio of the gases (R = V̇CO2/V̇air) and the RT were investigated on the precipitation process at constant flow rates. A comparison is presented between a batch reactor and a modular CFI. Results showed that narrower particle size distribution (PSD) with median particle diameters (d50,2) around 28 μm and more uniform morphology can be achieved by using a CFI for the continuous production of the powders.

High Quality Powder Precipitation Using a Continuous Segmented Flow Tubular Reactor and the “Scale-Out” Concept

2001 ◽  
Vol 73 (6) ◽  
pp. 661-661
Author(s):  
Alain Hassenfratz ◽  
Rainer Schenk ◽  
Christian Hofmann ◽  
Marcel Donnet ◽  
Nathalie Jongen ◽  
...  
Keyword(s):  
Tubular Reactor ◽  
Segmented Flow ◽  
High Quality

scholarly journals Process Intensification Approach Using Microreactors for Synthesizing Nanomaterials—A Critical Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 98
Author(s):  
Vikas Hakke ◽  
Shirish Sonawane ◽  
Sambandam Anandan ◽  
Shriram Sonawane ◽  
Muthupandian Ashokkumar
Keyword(s):  
Critical Review ◽  
High Surface ◽  
Process Intensification ◽  
Volume Ratio ◽  
Continuous Mode ◽  
Segmented Flow ◽  
Advantages And Disadvantages ◽  
Nanomaterial Synthesis ◽  
Recent Developments ◽  
Synthesis Of Nanomaterials

Nanomaterials have found many applications due to their unique properties such as high surface-to-volume ratio, density, strength, and many more. This review focuses on the recent developments on the synthesis of nanomaterials using process intensification. The review covers the designing of microreactors, design principles, and fundamental mechanisms involved in process intensification using microreactors for synthesizing nanomaterials. The microfluidics technology operates in continuous mode as well as the segmented flow of gas–liquid combinations. Various examples from the literature are discussed in detail highlighting the advantages and disadvantages of microfluidics technology for nanomaterial synthesis.

Development of a Continuous Segmented Flow Tubular Reactor and the “Scale-out” Concept – In Search of Perfect Powders

2003 ◽  
Vol 26 (3) ◽  
pp. 303-305 ◽  
Author(s):  
N. Jongen ◽  
M. Donnet ◽  
P. Bowen ◽  
J. Lemaître ◽  
H. Hofmann ◽  
...  
Keyword(s):  
Tubular Reactor ◽  
Segmented Flow

Continuous synthesis of nanostructured silica based materials in a gas–liquid segmented flow tubular reactor

2016 ◽  
Vol 40 (5) ◽  
pp. 4361-4366 ◽  
Author(s):  
Johannes Knossalla ◽  
Stefano Mezzavilla ◽  
Ferdi Schüth
Keyword(s):  
Tubular Reactor ◽  
Core Shell ◽  
Segmented Flow ◽  
Continuous Synthesis ◽  
Shell Particles ◽  
Nanostructured Silica

Synthesizing core–shell particles SiO2@mSiO2, mSiO2and Au@SiO2in a continuous tubular segmented reactor.

scholarly journals Helically coiled segmented flow tubular reactor for the hydroformylation of long-chain olefins in a thermomorphic multiphase system

2019 ◽  
Vol 377 ◽  
pp. 120060 ◽  
Author(s):  
Michael Jokiel ◽  
Nicolas Maximilian Kaiser ◽  
Péter Kováts ◽  
Michael Mansour ◽  
Katharina Zähringer ◽  
...  
Keyword(s):  
Tubular Reactor ◽  
Multiphase System ◽  
Segmented Flow ◽  
Long Chain
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