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Maximum-likelihood extremum seeking control of microalgae cultures

IFAC-PapersOnLine 2021年第3期54卷 336-341页

作者： Laurent Dewasme Alain Vande Wouwer Christian Gabin Feudjio Letchindjio Afaq Ahmad Sebastian Engell Systems Estimation Control and Optimization (SECO) University of Mons (UMONS) Belgium Process Dynamics and Operations Group Department of Biochemical and Chemical Engineering TU Dortmund University Germany

This paper proposes a model-free extremum seeking control (ESC) approach to optimize the productivity of continuous cultures of microalgae, considering the dilution rate and the light intensity as manipulated variables, and the biomass concentration as single measurement. The resulting two-input single-output optimization problem is first solved using a recursive least-squares strategy based on the representation of the process by a Hammerstein block-oriented model. In order to face the presence of noise on the regressor variables (input and output signals), the problem is then reformulated as a maximum-likelihood estimation problem, which is solved on a moving horizon. Simulation results demonstrate the method performance.

关键词： real-time optimization optimal control parameter estimation least-squares biotechnology

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design and Optimisation of Structural Packings for Rotating Bed Absorbers Using Computational Fluid Dynamics Simulation

SSRN

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SSRN 2022年

作者： Zawadzki, Dawid Blatkiewicz, Michal Jaskulski, Maciej Piątkowski, Marcin Koop, Jörg Loll, Rouven Górak, Andrzej Lodz University of Technology Faculty of Process and Environmental Engineering Department of Environmental Engineering 213 Wólczańska Str. Lódź93-005 Poland TU Dortmund University Department of Biochemical and Chemical Engineering Laboratory of Fluid Separations Emil-Figge-Straße 70 Dortmund44227 Germany TU Dortmund University Department of Biochemical and Chemical Engineering Laboratory of Plant and Process Design Emil-Figge-Straße 70 Dortmund44227 Germany

A method for pressure drop prediction using Computational fluid dynamics (CFD) was designed and validated experimentally with a set of baffle-based geometry types of Rotating Packed Bed’s packings. The methodology served as a foundation for a CFD optimisation tool of internal geometry based on minimal pressure drop. The baffles in the geometry were characterized by five parameters: bottom and top internal rounding, bottom and top external rounding, and baffle inclination angle. Based on the variables, 78 different geometry types were created and subjected to pressure drop optimisation with the CFD tool. The optimal geometry was manufactured, and the simulation results were verified experimentally. Up to 54% decrease in pressure drop was observed in comparison to the pre-optimisation packing. Mass transfer experiments were conducted with the use of CO 2 -NaOH absorption system, and results showed that the optimised packing, despite exhibiting less pressure drop, was capable of achieving up to 17% increase in effective mass transfer area. © 2022, The Authors. All rights reserved.

关键词： 3D printers

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Hollow Multishelled Structure: Synthesis Chemistry and Application

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chemical Research in Chinese Universities 2024年第3期40卷 346-393页

作者： MAO Dan WANG Chao LI Wei ZHOU Liang LIU Jian ZHENG Zjian ZHAO Yong CAO An-min WANG Shutao HUANG Jiaxing HUO Fengwei CHEN Hongyu MAI Liqiang YU Ranbo WANG Lianzhou LU Yunfeng YU Chengzhong YANG Qihua YANG Zhenzhong ZENG Hua Chun ZHAO Hujun TANG Zhiyong ZHAO Dongyuan WANG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChineseAcademy of SciencesBeijing 100190P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBejing 100190P.R.China School of Fashion and Textiles The Hong Kong Polytechnic UniversityHong Kong SARP.R.China Department of Chemistry Fudan UniversityShanghai 200433P.R.China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070P.R.China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023P.R.China School of Chemistry Beihang UniversityBejing 100191P.R.China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190P.R.China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190P.R.China School of Engineering Westlake UniversityHangzhou 310024P.R.China School of Flexible Electronics(Future Technologies) Nanjing Tech UniversityNanjing 211816P.R.China School of Science Westlake UniversityHangzhou 310024P.R.China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070P.R.China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083P.R.China School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQueensland 4072Australia College of Life Science and Technology Bejing University of Chemical TechnologyBejing 100029P.R.China School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200241P.R.China College of Life Sciences Zhejiang Normal UniversityJinhua 321004P.R.China Department of Chemical Engineering Tsinghua UniversityBeijing 100

Hollow multishelled structure(HoMS),a promising and complex multifunctional structural system,features at least two shells that are separated by internal *** unique structure endows it with numerous advantages including low density,high loading capacity,large specific surface area,facilitated mass transport,and multiple spatial confinement *** the past twenty years,benefiting from the booming development of synthesis methods,various HoMS materials have been prepared and show promising applications in diverse areas.

关键词： Hollow multishelled structure Synthesis chemistry Energy storage Catalysis Electromagnetic wave absorption Drug delivery Sensor

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Correction to "Model-Based Scale-Up of a Homogeneously Catalyzed Sonogashira Coupling Reaction in a 3D Printed Continuous-Flow Reactor"

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ACS engineering Au 2025年第1期5卷 66页

作者： Lisa Schulz Norbert Kockmann Thorsten Röder Institute of Chemical Process Engineering Mannheim University of Applied Sciences 68163 Mannheim Germany. Laboratory of Equipment Design Department of Biochemical and Chemical Engineering TU Dortmund University 44227 Dortmund Germany.

[This corrects the article DOI: 10.1021/acsengineeringau.4c00027.].

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design, Additive Manufacturing and Performance Benchmarking of a Rotor for Centrifugal Partition Chromatography

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Chemie Ingenieur Technik 2022年第9期94卷

作者： F. Buthmann P. Laby F. Schulte J. Koop G. Schembecker TU Dortmund Laboratory of Plant and Process Design – Department of Biochemical and Chemical Engineering Emil-Figge-Str. 70 44227 Dortmund Germany

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Exergy-based performance analysis for biojet fuel pathways in Brazil 32

Exergy-based performance analysis for biojet fuel pathways i...

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32nd International Conference on Efficiency, Cost, optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2019

作者： Silva Ortiz, Pablo A. Filho, Rubens Maciel Osseweijer, Patricia Posada, John School of Chemical Engineering Laboratory of Optimization Design and Advanced Process ControlLOPCA University of Campinas Brazil Faculty of Applied Sciences Department of Biotechnology Delft University of Technology Netherlands

ISBN: (纸本)9788361506515

Increasing efforts in developing sustainable and economically viable technologies to produce transportation fuels have been made in the last decades. Particularly, the aviation industry has conceived that biojet fuels are vital to decrease 50% of the greenhouse gas emissions by 2050 and to achieve carbon-neutral growth by 2020. Thus, the goal of this study is to rank self-sufficient biorefineries for biojet fuel production in Brazil bases on an exergy-based performance analysis aiming to identify the processes irreversibilities. The production capacity assumed for this analysis covers 10% of the projected fuel demand by 2020 in São Paulo (Guarulhos) and Rio de Janeiro (Galeão) airports and considers that the biojet fuel produced is suitable for blending with fossil jet up to 50%. In this context, the base capacity analysed was 210 kton jet/year considering sugarcane (SC) and SC straw as feedstocks, largely available in Brazil. Hence, 24 scenarios were compared for lignocellulosic and lignin valorization processes. These technological pathways covers eight pre-treatment processes such as dilute acid (DA), dilute acid + alkaline treatment (DA-A), steam explosion (SE), steam explosion + alkaline treatment (SE-A), organosolv (O), wet oxidation (WO), liquid hot water (LHW) and liquid hot water + alkaline treatment (LHW-A), followed by enzymatic hydrolysis. Furthermore, three thermochemical processes for the direct conversion of bagasse and lignin upgrade to renewable jet fuel or electricity were considered (Fast pyrolysis, Gasification Fischer-Tropsch and Cogeneration). The exergy assessment evidenced that combined pretreatment processes with the alkaline treatment (DA-A, SE-A, LHW-A) have a better global exergetic performance than the lignocellulosic pre-treatments carried out standalone (DA, SE, O, WO, and LHW). In addition, the use of fast-pyrolysis as a technology for the lignin residues presented the higher performance for all the scenarios. It is shown that the CO2

关键词： Lignin

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Corrigendum to "Challenges in tracing material flow passing a loss-in-weight feeder in continuous manufacturing processes" [Int. J. Pharm. 612 (2022) 121304]

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International journal of pharmaceutics 2022年 626卷 122077页

作者： Moritz Peterwitz Sina Gerling Gerhard Schembecker Laboratory of Plant and Process Design Faculty of Biochemical and Chemical Engineering TU Dortmund University Emil-Figge-Straße 70 D-44227 Dortmund Germany Invite GmbH Otto-Bayer-Straße 32 D-51061 Cologne Germany. Laboratory of Plant and Process Design Faculty of Biochemical and Chemical Engineering TU Dortmund University Emil-Figge-Straße 70 D-44227 Dortmund Germany. Laboratory of Plant and Process Design Faculty of Biochemical and Chemical Engineering TU Dortmund University Emil-Figge-Straße 70 D-44227 Dortmund Germany. Electronic address: gerhard.schembecker@tu-dortmund.de.

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Mathematical modelling and parametric studies for the methanol production in fixed bed catalytic reactor using Aspen plus

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AIP Conference Proceedings 2023年第1期2571卷

作者： Mohd Azahar Mohd Ariff Nor Adila Mohd Nasir Zulkifli Abdul Rashid Nur Alwani Ali Bashah Fakhrony Sholahudin Rohman School of Chemical Engineering College of Engineering Universiti Teknologi MARA Cawangan Pulau Pinang Kampus Permatang Pauh 13500 Permatang Pauh Pulau Pinang Malaysia Molecular System Design Process & Optimization Research Group (MODEPRO) Universiti Teknologi MARA Cawangan Pulau Pinang Kampus Permatang Pauh 13500 Permatang Pauh Pulau Pinang Malaysia School of Chemical Engineering College of Engineering Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia School of Chemical Engineering Engineering Campus Universiti Sains Malaysia Seri Ampangan 14300 Nibong Tebal Seberang Perai Selatan Pulau Pinang Malaysia

In this study, methanol production was simulated using Aspen plus mathematical modelling and the effect of pressure and temperature towards methanol reactor production and selectivity as well as reactant conversions were investigated. Nowadays, the number of methanol plants are increasing due to high demand worldwide. Reactor is one of the main equipment for the methanol production and high impact accident such as explosion, may happen due to the upset of the critical process temperature and pressure which also could create major fluctuation of the methanol production. Thus, the reactor behaviour needed to be studied promptly so that the risk assessment can be performed in a later stage. A mathematical model for the fixed bed catalytic reactor which used RPLUG in Aspen Plus software was developed based on industrial data. The model had been validated and the percent error was below 5.5% compared to the industrial data. The model was also much better compared to the previous research which used ANN MATLAB for the model validation. Overall, it concluded that Aspen Plus simulation for this model could be used to simulate the process with regards to any changes in the process parameters.

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P-nitrophenol degradation by gold nanoparticles augmented cellulosic microcapsules: Influence of catalyst dosage, reaction temperature and kinetic analysis

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AIP Conference Proceedings 2023年 050001页

作者： M. S. Osman S. S. Fadzil K. Khairudin N. A. A. Bashah M. Fathullah N. A. Nasrudin Faculty of Chemical Engineering Universiti Teknologi MARA Cawangan Pulau Pinang 13500 Permatang Pauh Penang Malaysia. Molecular System Design Process & Optimization (MODEPRO) research group Universiti Teknologi MARA Cawangan Pulau Pinang 13500 Permatang Pauh Penang Malaysia. School of Manufacturing Engineering Universiti Malaysia Perlis (UniMAP) Pauh Putra Campus 02600 Arau Perlis Malaysia. Center of Excellence Geopolymer & Green Technology (CEGeoGTech) Universiti Malaysia Perlis (UniMAP) 01000 Kangar Perlis Malaysia.

For the parametric research of P-nitrophenol degradation (PNP) performance, the alginate encapsulating method was used to improve gold nanoparticles using cellulosic microcapsules. The goals are to investigate the gold nanoparticles's kinetic model in the degradation of PNP using UV-Vis spectrometry and to determine the parametric of the effect of AuNP-cellulose catalyst dose on efficiency of its removal and the role of AuNP-cellulose in PNP degradation at a variation of temperatures. The gold nanoparticle was formulated by reducing citrate technique and synthesised with coconut husk cellulose before being transformed into microcapsules and then formed into AuNP-cellulosic microcapsule beads. An excess quantity of sodium borohydride, NaBH4, was used as a model reaction to assess the catalytic performance of AuNPs for the reduction of PNP. The quantities of AuNP-cellulose catalyst have been weighted at 5, 7, and 10 mg for the dose of AuNP-cellulose catalyst on PNP elimination efficiency. With a 10 mg catalyst dose, the maximum PNP removal rate of 96.1 percent is achieved. When AuNP-cellulose reactions in degrading PNP are compared at different temperatures (28°C, 35°C, 45°C, and 55°C), the degradation is quicker at 55°C, taking just 5 minutes. The catalytic system's activation energy (Ea) for PNP degrading into PAP is 13.63 kJ/mol. This research indicates that as the catalyst dose is raised, the removal efficiency improves, and high temperatures accelerate PNP decrease.

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Oriented PLDL Nanofibers

Oriented PLDL Nanofibers

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Microelectronics Technology and Devices (SBMicro)

作者： Nayara M. da S. Carvalho Marcele F. Passos Maria Regina W. Maciel Rubens Maciel Filho Rogerio Furlan Laboratory of Optimization Design and Advanced Process Control School of Chemical Engineering University of Campinas Campinas Brazil National Institute of Biofabrication School of Chemical Engineering University of Campinas Campinas Brazil Department of Physics and Electronics University of Puerto Rico at Humacao Humacao Puerto Rico

In this work, we present novel results of poly (Lco-D, L lactic acid) (PLDL) nanofibers deposited using a nonconventional electrospinning process. It allows to obtain fibers with vertical and horizontal alignment simultaneously. Extending the deposition time, a membrane-like structure with oriented fibers can be collected that is a prospective material for biomedical applications. Fibers with a higher concentration of PLDL, dissolved in chloroform and acetone, resulted in well-formed fibers with small diameters (600 nm to 710 nm).

关键词： Electrodes Optical fiber devices Optical fiber polarization Plastics Tissue engineering Silicon Chlorine compounds

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