A mathematical modeling study of the influence of small amounts of KCl solution tracers on mixing in water and residence time distribution of tracers in a continuous flow reactor-metallurgical tundish

2015 ◽  
Vol 137 ◽  
pp. 914-937 ◽  
Author(s):  
Chao Chen ◽  
Lage Tord Ingemar Jonsson ◽  
Anders Tilliander ◽  
Guoguang Cheng ◽  
Pär Göran Jönsson
Keyword(s):  
Mathematical Modeling ◽  
Residence Time ◽  
Continuous Flow ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow Reactor ◽  
Continuous Flow Reactor ◽  
Modeling Study

The Influence of Residence Time Distribution on Continuous Flow Polymerization

2019 ◽  
Author(s):  
Marcus Reis ◽  
Travis Varner ◽  
Frank Leibfarth
Keyword(s):  
Residence Time ◽  
Continuous Flow ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow Reactor ◽  
Continuous Production ◽  
Flow Chemistry ◽  
Statistical Correlations ◽  
Tubular Reactors ◽  
Vis Spectroscopy

<p>Continuous-flow chemistry is emerging as an enabling technology for the synthesis of precise polymers. Despite recent advances in this rapidly growing field, there remains a need for a fundamental understanding of how fluid dynamics in tubular reactors influence polymerizations. Herein, we report a comprehensive study of how laminar flow influences polymer structure and composition. Tracer experiments coupled with in-line UV-vis spectroscopy demonstrate how viscosity, tubing diameter, and reaction time affect the residence time distribution (RTD) of fluid in reactor geometries relevant for continuous-flow polymerizations. We found that the breadth of the RTD has strong, statistical correlations with reaction conversion, polymer molar mass, and dispersity for polymerizations conducted in continuous flow. These correlations were demonstrated to be general to a variety of different reaction conditions, monomers, and polymerization mechanisms. Additionally, these findings inspired the design of a droplet flow reactor that minimizes the RTD in continuous-flow polymerizations and enables the continuous production of well-defined polymer at a rate of 1.4 kg/day. </p>

The Influence of Residence Time Distribution on Continuous Flow Polymerization

2019 ◽  
Author(s):  
Marcus Reis ◽  
Travis Varner ◽  
Frank Leibfarth
Keyword(s):  
Residence Time ◽  
Continuous Flow ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow Reactor ◽  
Continuous Production ◽  
Flow Chemistry ◽  
Statistical Correlations ◽  
Tubular Reactors ◽  
Vis Spectroscopy

<p>Continuous-flow chemistry is emerging as an enabling technology for the synthesis of precise polymers. Despite recent advances in this rapidly growing field, there remains a need for a fundamental understanding of how fluid dynamics in tubular reactors influence polymerizations. Herein, we report a comprehensive study of how laminar flow influences polymer structure and composition. Tracer experiments coupled with in-line UV-vis spectroscopy demonstrate how viscosity, tubing diameter, and reaction time affect the residence time distribution (RTD) of fluid in reactor geometries relevant for continuous-flow polymerizations. We found that the breadth of the RTD has strong, statistical correlations with reaction conversion, polymer molar mass, and dispersity for polymerizations conducted in continuous flow. These correlations were demonstrated to be general to a variety of different reaction conditions, monomers, and polymerization mechanisms. Additionally, these findings inspired the design of a droplet flow reactor that minimizes the RTD in continuous-flow polymerizations and enables the continuous production of well-defined polymer at a rate of 1.4 kg/day. </p>

The Influence of Residence Time Distribution on Continuous-Flow Polymerization

2019 ◽  
Vol 52 (9) ◽  
pp. 3551-3557 ◽  
Author(s):  
Marcus H. Reis ◽  
Travis P. Varner ◽  
Frank A. Leibfarth
Keyword(s):  
Residence Time ◽  
Continuous Flow ◽  
Time Distribution ◽  
Residence Time Distribution

scholarly journals Explicit Residence Time Distribution of a Generalised Cascade of Continuous Stirred Tank Reactors for a Description of Short Recirculation Time (Bypassing)

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 615 ◽  
Author(s):  
Peter Toson ◽  
Pankaj Doshi ◽  
Dalibor Jajcevic
Keyword(s):  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow Reactor ◽  
Plug Flow ◽  
Stirred Tank ◽  
Stirred Tank Reactors ◽  
Delayed Impulse ◽  
In Series ◽  
Back Mixing

The tanks-in-series model (TIS) is a popular model to describe the residence time distribution (RTD) of non-ideal continuously stirred tank reactors (CSTRs) with limited back-mixing. In this work, the TIS model was generalised to a cascade of n CSTRs with non-integer non-negative n. The resulting model describes non-ideal back-mixing with n > 1. However, the most interesting feature of the n-CSTR model is the ability to describe short recirculation times (bypassing) with n < 1 without the need of complex reactor networks. The n-CSTR model is the only model that connects the three fundamental RTDs occurring in reactor modelling by variation of a single shape parameter n: The unit impulse at n→0, the exponential RTD of an ideal CSTR at n = 1, and the delayed impulse of an ideal plug flow reactor at n→∞. The n-CSTR model can be used as a stand-alone model or as part of a reactor network. The bypassing material fraction for the regime n < 1 was analysed. Finally, a Fourier analysis of the n-CSTR was performed to predict the ability of a unit operation to filter out upstream fluctuations and to model the response to upstream set point changes.

Heterogeneous Dipeptide-Catalyzed α-Amination of Aldehydes in a Continuous-Flow Reactor: Effect of Residence Time on Enantioselectivity

2015 ◽  
Vol 357 (16-17) ◽  
pp. 3671-3680 ◽  
Author(s):  
Sándor B. Ötvös ◽  
Aliz Szloszár ◽  
István M. Mándity ◽  
Ferenc Fülöp
Keyword(s):  
Residence Time ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Continuous Flow Reactor

Residence Time Distribution (RTD) of Particulate Foods in a Continuous Flow Pilot-Scale Ohmic Heater

2009 ◽  
Vol 74 (6) ◽  
pp. E322-E327 ◽  
Author(s):  
Sanjay Sarang ◽  
Brian Heskitt ◽  
Priyank Tulsiyan ◽  
Sudhir K. Sastry
Keyword(s):  
Residence Time ◽  
Continuous Flow ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Pilot Scale ◽  
Ohmic Heater
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