scholarly journals Dawn of a new era in industrial photochemistry: the scale-up of micro- and mesostructured photoreactors

2020 ◽  
Vol 16 ◽  
pp. 2484-2504
Author(s):  
Emine Kayahan ◽  
Mathias Jacobs ◽  
Leen Braeken ◽  
Leen CJ Thomassen ◽  
Simon Kuhn ◽  
...  
Keyword(s):  
Scientific Community ◽  
Scale Up ◽  
Process Intensification ◽  
Process Conditions ◽  
Comprehensive Understanding ◽  
New Era ◽  
Thermochemical Activation ◽  
Space Time Yield ◽  
Selection Of ◽  
Photochemical Activation

Photochemical activation routes are gaining the attention of the scientific community since they can offer an alternative to the traditional chemical industry that mainly utilizes thermochemical activation of molecules. Photoreactions are fast and selective, which would potentially reduce the downstream costs significantly if the process is optimized properly. With the transition towards green chemistry, the traditional batch photoreactor operation is becoming abundant in this field. Process intensification efforts led to micro- and mesostructured flow photoreactors. In this work, we are reviewing structured photoreactors by elaborating on the bottleneck of this field: the development of an efficient scale-up strategy. In line with this, micro- and mesostructured bench-scale photoreactors were evaluated based on a new benchmark called photochemical space time yield (mol·day−1·kW−1), which takes into account the energy efficiency of the photoreactors. It was manifested that along with the selection of the photoreactor dimensions and an appropriate light source, optimization of the process conditions, such as the residence time and the concentration of the photoactive molecule is also crucial for an efficient photoreactor operation. In this paper, we are aiming to give a comprehensive understanding for scale-up strategies by benchmarking selected photoreactors and by discussing transport phenomena in several other photoreactors.

Scale-up of Process Intensifying Falling Film Microreactors to Pilot Production Scale

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Bhanu Kiran Vankayala ◽  
Patrick Löb ◽  
Volker Hessel ◽  
Gabriele Menges ◽  
Christian Hofmann ◽  
...  
Keyword(s):  
Sodium Hydroxide Solution ◽  
Ambient Pressure ◽  
Scale Up ◽  
Process Intensification ◽  
Aqueous Sodium Hydroxide ◽  
Liquid Films ◽  
Process Conditions ◽  
Falling Film ◽  
Production Scale ◽  
Future Production

Microstructured reactors with their benefits especially concerning enhanced mass and heat transfer represent a means for process intensification. A broadly used microstructured lab tool in the area of gas/liquid contacting is the Falling Film Microreactor (FFMR) developed by IMM in which liquid films of a few tens of micrometer thickness and interfacial areas of up to 20,000 m2/m3 combined with an effective heat exchange can be obtained. Now the concept of the Falling Film Microreactor has been developed further with regard to increasing throughput in order to reach pilot production level and as a basis for future production scale throughput. Therefore, two different prototypes with a tenfold larger structured surface area have been developed and realized. The feasibility of a corresponding increase of throughput has been demonstrated for the oxidation of an organic compound using oxygen which is closely linked to an industrial relevant reaction and additionally by the absorption of CO2 in an aqueous sodium hydroxide solution. Naturally, process optimisation itself also contributes to the efforts to increase throughput. Therefore, the oxidation reaction has been optimised in both varying process parameters (temperature, flow rates, pressure) and reactor parameters (microchannel width and depth) in the original, standard Falling Film Microreactor. Conducting experiments at 10 bar instead of ambient pressure and using a reaction plate with 1200 µm x 400 µm channels instead of 600 µm x 200 µm channels lead to an increase in conversion. These investigations also encourage exploring more challenging process conditions and thereby following the concept of "novel chemistry."

Study on the Chemical Modification Process of Jute Fiber

TAPPI Journal ◽  
2010 ◽  
Vol 9 (2) ◽  
pp. 23-29 ◽  
Author(s):  
Wei-ming Wang ◽  
Zai-sheng Cai ◽  
Jian-yong Yu
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Treatment Time ◽  
Jute Fiber ◽  
Process Conditions ◽  
Silicate Concentration ◽  
Sodium Hydroxide Concentration ◽  
Liquor Ratio ◽  
Degumming Process ◽  
Selection Of

Degumming of pre-chlorite treated jute fiber was studied in this paper. The effects of sodium hydroxide concentration, treatment time, temperature, sodium silicate concentration, fiber-to-liquor ratio, penetrating agent TF-107B concentration, and degumming agent TF-125A concentration were the process conditions examined. With respect to gum decomposition, fineness and mechanical properties, sodium hydroxide concentration, sodium silicate concentration, and treatment time were found to be the most important parameters. An orthogonal L9(34) experiment designed to optimize the conditions for degumming resulted in the selection of the following procedure: sodium hydroxide of 12g/L, sodium silicate of 3g/L, TF-107B of 2g/L, TF-125A of 2g/L, treatment time of 105 min, temperature of 100°C and fiber to liquor ratio of 1:20. The effect of the above degumming process on the removal of impurities was also examined and the results showed that degumming was an effective method for removing impurities, especially hemicellulose.

Collaborating for Our Future

2018 ◽  
Author(s):  
Barbara Gray ◽  
Jill Purdy
Keyword(s):  
Management Education ◽  
Care Delivery ◽  
Scale Up ◽  
Collaborative Governance ◽  
Comprehensive Understanding ◽  
Theoretical Understanding ◽  
Effect Change ◽  
Working Together ◽  
Vantage Points ◽  
Multistakeholder Partnerships

Organizations turn to multistakeholder partnerships (MSPs) to meet challenges they cannot handle alone. By tapping diverse stakeholders’ resources, MSPs develop the capability to address complex issues and problems, such as health care delivery, poverty, human rights, watershed management, education, sustainability, and innovation. This book provides a comprehensive understanding of MSPs, why they are needed, the challenges partners face in working together, and how to design them effectively. Through the process of collaboration partners combine their differing strengths, vantage points, and expertise to craft innovative responses to pressing societal concerns. The book offers valuable advice for leaders about how to design and scale up effective partnerships and how to address potential obstacles partners may face, such as dealing with the conflicts and power issues likely to arise as partners negotiate with each other. Drawing on three comprehensive cases and countless shorter examples from around the world, the book offers practical advice for organizations embarking on an MSP, as well as theoretical understanding of how partnerships function. Using an institutional theory lens, it explains how partnerships can effect change in institutional fields by reducing turbulence and negotiating a common set of norms and routines to govern partners’ future interactions within the field of concern. Topics covered include: the nature of working collaboratively, why partnerships are needed, types of partnerships, guidelines for partnership design, partnerships and field dynamics, how to deal with conflicts among partners, negotiating across power differences, partnerships for sustainability, collaborative governance, working across scale differences, and how partnerships transform fields.

Characterizing the epoxidation process conditions of canola oil for reactor scale-up

2015 ◽  
Vol 67 ◽  
pp. 364-372 ◽  
Author(s):  
Ewumbua M. Monono ◽  
Darrin M. Haagenson ◽  
Dennis P. Wiesenborn
Keyword(s):  
Canola Oil ◽  
Scale Up ◽  
Process Conditions

Application of Microfluidics in Process Intensification

2018 ◽  
Vol 16 (12) ◽  
Author(s):  
Harrson S. Santana ◽  
Mariana G. M. Lopes ◽  
João L. Silva ◽  
Osvaldir P. Taranto
Keyword(s):  
Scale Up ◽  
Production Capacity ◽  
Process Intensification ◽  
Plant Size ◽  
Chemical Plant ◽  
Sustainable Operations ◽  
Production Techniques ◽  
Equipment Size ◽  
System Miniaturization

Abstract Is it possible to miniaturize a chemical plant? Some strategies, such as the process intensification, sustain that the advancements in equipment and production techniques could substantially decrease the equipment size/production capacity ratio, energy consumption and waste generation, resulting in more economic and sustainable operations and consequently reducing the chemical plant size. However, large reductions of equipment volume represent a major challenge for the conventional technologies. In this context, Microfluidics represents a promising technology in the field of system miniaturization. Accordingly, the present research evaluated the concept of process intensification and its relationship with Microfluidics. Initially, the definition and the classification of process intensification were described, following by the explanation of the Microfluidics, highlighting scale-up strategies and examples using miniaturized systems. Afterward, a methodology for miniaturized devices development for process intensification using numerical simulations was shown. Finally, the conclusions are exposed.

Modelling Flue Gas Desulfurization Using Pyrolusite Pulp in a Jet Bubbling Reactor

2009 ◽  
Vol 610-613 ◽  
pp. 85-96 ◽  
Author(s):  
Jing Dong Zhao ◽  
Shi Jun Su ◽  
Nan Shan Ai ◽  
Xiao Fan Zhu
Keyword(s):  
Flue Gas ◽  
Ph Value ◽  
Scale Up ◽  
Absorption Efficiency ◽  
Flue Gas Desulfurization ◽  
Process Conditions ◽  
Gas Temperature ◽  
Transfer Coefficients ◽  
Set Up ◽  
So2 Absorption

A mathematical model for flue gas desulfurization using pyrolusite pulp in jet bubbling reactor (JBR) was described. Firstly, based on the concept of two stages mass balance with chemical reaction, two models were set up, for jet bubbling zone and rising bubble zone, respectively, according to the construction of JBR. The models consist of two coupling differential equations and were solved simultaneously by integral and separation of the variables. Then the SO2 absorption efficiency expression was developed, considering the great discrepancy existing between the gas-side mass transfer coefficients of the jet bubbling zone and gas bubble rising zone. The final expression associates SO2 absorption efficiency with process conditions and JBR structure parameters, which can give some instruction and guidance for the study of reactor operation process. Predicted results from the theoretical model, including effect of pH value of the pulp, flue gas temperature and inlet SO2 concentration of flue gas on SO2 absorption efficiency, were found to be in good agreement with experimental data obtained in a jet bubbling reactor. The model provides a basis for the process scale up and operating guide.

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