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Insights into adsorbent tortuosity across aqueous adsorption systems

Particuology 2024年第5期88卷 71-88页

作者： Ackmez Mudhoo Marta Otero khim hoong chu Department of Chemical and Environmental Engineering Faculty of EngineeringUniversity of MauritiusRéduit 80837Mauritius Department of Applied Chemistry and Physics Universidad de LeónCampus de Vegazana 24071 LeónSpain Department of Chemical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia

Pore network,pore connectivity,and the resulting effective adsorbate pore diffusivity within an adsorbent are critical physical considerations in mass transport modeling of aqueous *** to these three adsorbent features are the adsorbent tortuosity and tortuosity factor *** concepts encompass the collective hindrance to intra-adsorbent adsorbate transport arising because of a disorderly adsorbent porous *** is crucial for materials scientists,chemists,chemical engineers,and water treatment specialists to understand the complex and variable connections among adsorbate chemistry,adsorbent chemistry,adsorbent porosity,pore shape,size,and tortuosity,pore wall effect,adsorbate-adsorbent interactions,and adsorbate-adsorbate interactions in competitively contaminated aqueous *** tortuosity has been sporadically studied in aqueous adsorption *** the small population of these studies,insightful observations and inferences have been ***,as it appears,no review has been published to compile,compare,and contrast these ***,this review concisely brings up those observations and interpretations around adsorbent tortuosity for aqueous adsorption *** notion of an adsorbent's tortuosity being single-valued is argued to be ***,perspectives are aired on possible research and development directions for elucidating the dynamic attributes of adsorbent tortuosity and applying them in real-scale adsorption-oriented water *** data acquired by filling in these research gaps can enable the design of adsorbents more adapted for real-scale water purification.

关键词： Adsorbent Tortuosity Porosity Pore diffusion models Aqueous systems

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Can the Bass innovation diffusion model describe adsorption breakthrough curves of pharmaceutical contaminants?

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Green Chemical Engineering 2024年第2期5卷 145-149页

作者： khim hoong chu Mohd Ali Hashim Department of Chemical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur50603Malaysia

*** Fixed bed adsorption is a widely used separation process in the chemical industry for the processing of liquids and *** performance of fixed bed adsorption systems is often evaluated by analyzing the breakthrough curves,which represent the variation of the solute concentration in the effluent stream as a function of time or bed volume.

关键词： adsorption breakthrough curves

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Attrition resistance,a sporadically studied factor in aqueous adsorption:Status quo and research outlook towards creating better adsorbents

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颗粒学报:英文版 2023年第6期77卷 71-78页

作者： Ackmez Mudhoo khim hoong chu Prasenjit Mondal Department of Chemical and Environmental Engineering Faculty of EngineeringUniversity of MauritiusRéduit80837Mauritius Honeychem Research NewtownWellington6021New Zealand Department of Chemical Engineering Indian Institute of Technology RoorkeeRoorkeeUttarakhand247667India

Attrition resistance in an adsorbent is one measure of its mechanical *** quantifies its ability to resist the impact of frictional forces generated in a milieu where hydrodynamic agitation ***,attrition resistance has been only sporadically examined in adsorbents used to remove aqueous *** attrition is relevant in aqueous adsorption process design,this review discusses the quan-tification of attrition resistance,variability in loss due to attrition across adsorbents,and the implications of attrition on adsorption ***,some key research opportunities that could be explored for a better understanding of attrition in real-scale water purification are *** is inferred that sub-stantial research and development still needs to be accomplished to better understand the attrition resistance-adsorbent behavior within real-scale aqueous adsorption *** results can be harnessed to design and produce more robust,efficient and cost-effective adsorbents.

关键词： Attrition resistance Adsorbent Morphology change Aqueous adsorbate

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Symbiosis Analysis on Industrial Ecological System

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Chinese Journal of Chemical Engineering 2014年第6期22卷 690-698页

作者：汪刚冯宵 khim hoong chu Department of Chemical Engineering Xi’an Jiaotong University State Key Laboratory of Heavy Oil Processing China University of Petroleum

Industrial ecological system is a sustainable mode of modern industry development. Industrial symbiosis, a sub-field of industrial ecology, engages traditionally separate industries in a collective approach, involving exchange of materials, energy, water, and/or by-products, to enhance competitive ability and environmental performance. To construct a symbiosis analysis method, this article employs a number of parameters embodying information about materials, energy and economics as the main essential parameters in system analysis and introduces symbiosis profit and symbiotic consumption elements as the economic indicators. A modeling and simulation program is designed using the agent-based modeling approach to simulate the evolvement of a hypothetical coal-based industrial system and the change of symbiosis conditions in the process of construction is examined. The simulation program built using the Swarm library, which is a freely available multi-agent simulation package, provides a useful demonstration for the symbiosis analysis method.

关键词： symbiosis analysis symbiosis degree agent-based modeling multi-agent simulation coal-based industrial system

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Industrial-scale Fixed-bed Coal Gasification: Modeling, Simulation and Thermodynamic Analysis

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Chinese Journal of Chemical Engineering 2014年第5期22卷 522-530页

作者：何畅冯霄 khim hoong chu 李安学刘永健 State Key Laboratory of Heavy Oil Processing China University of Petroleum Honeychem Nanjing Chemical Industry Park Liaoning Datang International Fuxin Coal-To-SNG CO. LTD

We have developed a process model to simulate the behavior of an industrial-scale pressurized Lurgi fixed-bed coal gasifier using Aspen Plus and General Algebraic Modeling System(GAMS). Reaction characteristics in the fixed-bed gasifier comprising four sequential reaction zones—drying, pyrolysis, combustion and gasification are respectively modeled. A non-linear programming(NLP) model is developed for the pyrolysis zone to estimate the products composition which includes char, coal gases and distillable liquids. A four-stage model with restricted equilibrium temperature is used to study the thermodynamic equilibrium characteristics and calculate the composition of syngas in the combustion and gasification zones. The thermodynamic analysis shows that the exergetic efficiency of the fixed-bed gasifier is mainly determined by the oxygen/coal ratio. The exergetic efficiency of the process will reach an optimum value of 78.3% when the oxygen/coal and steam/coal mass ratios are 0.14 and 0.80, respectively.

关键词： Lurgi gasifier gasification syngas pyrolysis exergetic efficiency

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