scholarly journals Oscillatory Flow Bioreactor (OFB) Applied in Enzymatic Hydrolysis at High Solid Loadings

2020 ◽  
Vol 33 (4) ◽  
pp. 459-470 ◽  
Author(s):  
J. Buchmaier ◽  
Christoph Brunner ◽  
Bettina Muster ◽  
Bernd Nidetzky ◽  
Rama Krishna Gudiminchi ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Oscillatory Flow ◽  
Flow Reactor ◽  
Oscillation Amplitude ◽  
Plug Flow ◽  
Continuous Processes ◽  
High Solid ◽  
Hydrolysis Process ◽  
Conversion Efficiencies ◽  
Power Densities

Within this study, an enzymatic hydrolysis process using α-cellulosic feedstock was<br /> performed in a specially designed plug-flow reactor, referred to as an Oscillatory Flow<br /> Bioreactor (OFB). The aims of this approach were to achieve intensification in terms of<br /> realising a more energy- and resource-efficient enzymatic hydrolysis, as well as to set the<br /> basis for continuous processes in such a reactor. The OFB performance was evaluated for<br /> high solid loadings of up to 15 %, and compared to the performance of a Stirred Tank Reactor (STR). Experimental results of the OFB operating at an oscillation frequency of<br /> 2 Hz and an oscillation amplitude of 10 mm exhibit better conversion efficiencies (+ 6.7 %)<br /> than the STR after 24 h, while requiring only 7 % of the STR power density (W m–3). Therefore, the OFB enables efficient, uniform mixing at lower power densities than STRs for applications with high solid loadings.

scholarly journals Oscillatory flow reactors for synthetic chemistry applications

2020 ◽  
Vol 10 (3) ◽  
pp. 475-490 ◽  
Author(s):  
Pauline Bianchi ◽  
Jason D. Williams ◽  
C. Oliver Kappe
Keyword(s):  
Mass Transfer ◽  
Oscillatory Flow ◽  
Flow Reactor ◽  
Plug Flow ◽  
Operating Conditions ◽  
Solid Particles ◽  
Flow Reactors ◽  
Liquid Systems ◽  
Suspend Solid ◽  
Biphasic Systems

Abstract Oscillatory flow reactors (OFRs) superimpose an oscillatory flow to the net movement through a flow reactor. OFRs have been engineered to enable improved mixing, excellent heat- and mass transfer and good plug flow character under a broad range of operating conditions. Such features render these reactors appealing, since they are suitable for reactions that require long residence times, improved mass transfer (such as in biphasic liquid-liquid systems) or to homogeneously suspend solid particles. Various OFR configurations, offering specific features, have been developed over the past two decades, with significant progress still being made. This review outlines the principles and recent advances in OFR technology and overviews the synthetic applications of OFRs for liquid-liquid and solid-liquid biphasic systems.

A stochastic model for two-station hydraulics exhibiting transient impact

1997 ◽  
Vol 36 (5) ◽  
pp. 19-26 ◽  
Author(s):  
J. L. Jacobsen ◽  
H. Madsen ◽  
P. Harremoès
Keyword(s):  
Parameter Estimation ◽  
Flow Reactor ◽  
Deterministic Model ◽  
Plug Flow ◽  
Stochastic Methods ◽  
Sewer System ◽  
Statistical Tool ◽  
Water Level Variation ◽  
Deterministic Description ◽  
Linear Reservoir

The objective of the paper is to interpret data on water level variation in a river affected by overflow from a sewer system during rain. The simplest possible, hydraulic description is combined with stochastic methods for data analysis and model parameter estimation. This combination of deterministic and stochastic interpretation is called grey box modelling. As a deterministic description the linear reservoir approximation is used. A series of linear reservoirs in sufficient number will approximate a plug flow reactor. The choice of number is an empirical expression of the longitudinal dispersion in the river. This approximation is expected to be a sufficiently good approximation as a tool for the ultimate aim: the description of pollutant transport in the river. The grey box modelling involves a statistical tool for estimation of the parameters in the deterministic model. The advantage is that the parameters have physical meaning, as opposed to many other statistically estimated, empirical parameters. The identifiability of each parameter, the uncertainty of the parameter estimation and the overall uncertainty of the simulation are determined.

Efficient Production of Light Olefin Based on Methanol Dehydration: Simulation and Design Improvement

2020 ◽  
Vol 23 ◽  
Author(s):  
S. Majid Abdoli ◽  
Mahsa Kianinia
Keyword(s):  
Dimethyl Ether ◽  
Flow Reactor ◽  
New Technology ◽  
Plug Flow ◽  
Light Olefins ◽  
Efficient Production ◽  
Actual Process ◽  
Light Olefin ◽  
Aspen Hysys ◽  
Improved Design

Background: Ethylene, propylene, and butylene as light olefins are the most important intermediates in the petrochemical industry worldwide. Methanol to olefins (MTO) process is a new technology based on catalytic cracking to produce ethylene and propylene from methanol. Aims and Objective: This study aims to simulate the process of producing ethylene from methanol by using Aspen HYSYS software from the initial design to the improved design. Methods: Ethylene is produced in a two-step reaction. In an equilibrium reactor, the methanol is converted to dimethyl ether by an equilibrium reaction. The conversion of the produced dimethyl ether to ethylene is done in a conversion reactor. Changes have been made to improve the conditions and get closer to the actual process design done in the industry. The plug flow reactor has been replaced by the equilibrium reactor, and the distillation column was employed to separate the dimethyl ether produced from the reactor. Result and Conclusion: The effect of the various parameters on the ethylene production was investigated. Eventually, ethylene is

Enzymatic textile recycling – best practices and outlook

2021 ◽  
pp. 0734242X2110291
Author(s):  
Benjamin Piribauer ◽  
Andreas Bartl ◽  
Wolfgang Ipsmiller
Keyword(s):  
Enzymatic Hydrolysis ◽  
Complete Removal ◽  
The European Union ◽  
Textile Processing ◽  
Current State ◽  
Industrial Implementation ◽  
Hydrolysis Process ◽  
Textile Recycling ◽  
Textile Sector ◽  
Suitable Process

Recently, textiles and their end-of-life management have become the focus of public and political attention. In the European Union the revised waste framework directive defines textiles as municipal waste and stipulates their separate collection by 2025. In the context of these developments, this paper summarises briefly the current state-of-the-art in textile recycling. It is evident that recycling methods are not yet fully developed. This is especially the case with multi-material textiles, which are composed of two or more polymers that are incompatible for recycling. In the practical part of the communication, results are presented which show that enzymatic hydrolysis is a suitable process for recycling textiles made of cotton and polyester. After a complete removal of cotton, the remaining pure polyester fibres undergo a re-granulation and post-condensation step. The so obtained recycled polyester is fed back into the textile processing chain and finally towels are obtained. The main steering parameters of the enzymatic hydrolysis process are described. The study proves that solutions in accordance with the Circular Economy in the textile sector are available but an industrial implementation has not yet been realised.

The Effect of Xylan Removal on the High-Solid Enzymatic Hydrolysis of Sugarcane Bagasse

2021 ◽  
Author(s):  
Leidy Patricia Quintero ◽  
Nathalia P. Q. de Souza ◽  
Adriane M. F. Milagres
Keyword(s):  
Enzymatic Hydrolysis ◽  
Sugarcane Bagasse ◽  
High Solid ◽  
Hydrolysis Of

Enhancing Fenton-like oxidation of crystal violet over Fe/ZSM-5 in a plug flow reactor

2021 ◽  
Author(s):  
Sara Modarresi-Motlagh ◽  
Fatemeh Bahadori ◽  
Mohammad Ghadiri ◽  
Arash Afghan
Keyword(s):  
Crystal Violet ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor
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