Chemical Engineering Commons^™

Development Of Quaternized Poly(Vinyl Alcohol)/Chitosan/Two-Dimensional Molybdenum Disulfide Anion Exchange Membrane As A Separator For Electrochemical Processes, Nuttapon Suppanucroa

Chulalongkorn University Theses and Dissertations (Chula ETD)

In response to the global shift toward the expansion of large-scale energy storage systems (ESSs), secondary zinc-air batteries (ZABs) have attracted significant attention as promising candidates for next-generation batteries due to their high energy density, cost-effectiveness, and safety. However, their long-term practical application is hindered by several challenges associated with the membrane separator, including the formation of resistive zinc oxide layers and low hydroxide-ion conductivity. These limitations are attributed to poor ion-selectivity, which impedes electrochemical reactions and degrades battery performance. To address these issues, this study developed a series of innovative membrane separators featuring quaternary ammonium (QA)-functionalized polyvinyl alcohol (PVA), …

Hydrogen Production From Glycerol Using Sorption Enhanced Chemical Looping Steam Reforming With Multifunctional Pellet Catalyst, Talita Nimmas

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study, the synthesis of a pellet-scale material for hydrogen (H₂) production from glycerol via the Sorption Enhanced Chemical Looping Steam Reforming (SE-CL-SGR) process was investigated. The research focuses on material synthesis, performance enhancement, and the economic and environmental advantages of the developed material. Among the synthesis methods compared, the Stepwise Calcination process demonstrated the best performance, producing structurally stable and mechanically robust pellets. The optimal CaO/support mass ratio for the Ni-supported material (15Ni(70Ca.30Support)) was found to achieve 90% v/v H₂ purity with a pre-breakthrough time of approximately 75 minutes. Rare-earth metal oxides (CeO₂, La₂O₃) addition also improved mechanical …

Regeneration By Electrodialysis Of Secondary Spent Monoethanolamine Solution Obtained After Mineralisation Of Captured Carbon Dioxide With Calcium Sulfate, Ketwarang Nimnualrat

Chulalongkorn University Theses and Dissertations (Chula ETD)

The greenhouse effect has been impacting our planet further than we even realized. In recent years, the earth’s atmosphere has rapidly changed at a faster pace than ever. The main villain, mostly released from industry, is carbon dioxide (CO2), which contributes about 79.7 percent of total greenhouse gases. Consequently, Carbon Capture, Utilization and Storage (CCUS) has now become an important role to mitigate this problem. A widely used industrial medium for capturing CO2 is aqueous solution of monoethanolamine (MEA), which is capable of capturing CO2 from fossil fuel-fired processes. However, current MEA regeneration by stripping has high energy requirements for …

Enhance Effectiveness Of Monitoring Scheme Using Insar On Tailings Storage Facility No. 2, Chatree Gold Mine, Thailand, Shanghai Chea

Chulalongkorn University Theses and Dissertations (Chula ETD)

Tailings storage facility (TSF) is a critical component of the mining industry, serving to safely contain waste generated during mineral extraction. At Chatree Gold Mine, the largest and only active gold mine in Thailand, TSF No.2 handles approximately 5 million tons of tailings annually. Effective monitoring of the facility is crucial for hazard prevention and regulatory compliance. This study aims to enhance the monitoring scheme of TSF No.2 by employing Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) technique, processed via MintPy software, to analyze ground deformation. Despite traditional monitoring methods, such as in-situ geodetic surveying, offering valuable insights, they …

Recovery Of Tin From Kaolin Mine Tailing, Rangoon, Thailand, Archana Pandit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study investigates the recovery of tin from kaolin waste using gravity, electrostatic, and magnetic separation techniques. A total of 123.500 kg of sand and 103.200 kg of silt were processed using a shaking table, spiral concentrator, high-tension separator, induced roll magnetic separator, and Frantz magnetic separator. Mineralogical and chemical characterization was conducted using X-ray diffractometer (XRD), X-ray fluorescence (XRF), and microscopic analysis to determine tin distribution and occurrence. Experimental results showed that the silt fractions generally exhibited higher tin content than the sand fractions. In this study, Case A refers to the samples (Sand A and Silt A) processed …

Ethanol-Assisted Co2 Hydrogenation To Methanol In A Trickle-Bed Reactor, Pattarapol Akeakkharanusorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

The hydrogenation of carbon dioxide (CO2) to methanol is a promising approach for CO2 utilization. However, conventional methanol synthesis is thermodynamically limited at high temperatures. Alcohol-assisted methanol synthesis has emerged as a novel low-temperature method, using alcohol as a catalytic solvent to alter reaction pathways. Equilibrium analysis using Gibbs free energy minimization in Aspen Plus showed that increasing ethanol enhanced CO2 conversion and methanol yield. At high ethanol concentrations, ethanol remained in the liquid phase. This study investigated ethanol-assisted CO2 hydrogenation in a trickle-bed reactor using a commercial Cu/ZnO/Al2O3 catalyst. CO2 and H2 were introduced in gaseous form, while ethanol …

Simulation Study For Enhancing Thermal Performance Of Cotton Facemasks Through Integration Of Organic Phase Change Materials, Poptham Chaviengpop

Chulalongkorn University Theses and Dissertations (Chula ETD)

Climate change has caused temperature extremities around the world. Maintaining body temperature against cold temperatures is important for preventing long term health risks. PCM incorporated facemasks offers the solution to this problem. In this study, computational fluid dynamics utilizing laminar flow of air in a simulated wind chamber is used to model the human breathing cycle in cold environments (0-10°C) through four different types of PCM incorporation facemasks (random, coating, hollow fiber, and lamination) used in the industry and three separate PCM candidates (n-octadecane, capric acid, and PEG-600). The findings indicates that the facemask utilizing the coating PCM incorporation method …

Photocatalytic Activity Of N, S-Cqds/Tio2 Composites For The Degradation Of Methylene Blue Under Light Irradiation, Thanyapak Akkharaamnuay

Chulalongkorn University Theses and Dissertations (Chula ETD)

Water pollution from synthetic dyes like methylene blue (MB), especially from textile industries, poses serious environmental challenges due to their resistance to conventional treatment. This study focuses on the develops nitrogen and sulfur co-doped carbon quantum dots (N, S-CQDs) incorporated into titanium dioxide (TiO2) for the degradation of methylene blue under light irradiation. The composites were calcined at 400 °C and 500 °C to investigate the effect of calcination temperature on photocatalytic performance. Characterization was conducted using techniques such as XRD, SEM-EDX, TEM, FT-IR, UV–Vis spectroscopy, Photoluminescence, and BET analysis. The results revealed that increasing the calcination temperature enhanced crystallinity, …

Regeneration Of Carbon Dioxide-Rich Amines Via Mineralization, Tanasorn Thumpanisakool

Chulalongkorn University Theses and Dissertations (Chula ETD)

Carbon dioxide (CO2) a major driver of the increasing greenhouse effect, making the development of CO2 capture and utilization technologies. Although monoethanolamine (MEA) is a highly efficient sorbent, the energy cost of its thermal regeneration remains a significant challenge. This thesis investigates a low-energy regeneration route for MEA based on mineralized CO2. Especially, the study systematically investigates the effects of MEA concentration, calcium source selection, and amine regeneration mechanisms. A 5 M MEA solution achieved a CO2 loading capacity up to 2.9 mol/L. However, mineralization with CaSO4 alone resulted in irreversible MEA protonation and poor reusability. Mechanistic analysis revealed that …

Design And Development Of A Sustainable Ethylene Glycol Production Process Via Electrochemical Co2 Reduction, Nichapat Leelalertwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Addressing the critical issue of rising atmospheric CO2 concentrations and their impact on climate change necessitates innovative technological solutions. This study presents a novel and sustainable method for producing ethylene glycol, commonly used in antifreeze, polyester, and various industrial applications, through electrochemical CO2 reduction, offering a lower environmental impact compared to conventional coal-based or biomass-based processes. This process is known as the "OCEAN" technique, which utilizes oxalic acid as a key intermediate to enhance efficiency and minimize unwanted byproducts. The process was simulated in Aspen Plus to evaluate both technological performance and environmental impact. CO2 is converted to oxalic acid …

Parametrization Of Fluid Models For Electrical Breakdown Of Nitrogen At Atmospheric Pressure, Shirshak K. Dhali

Electrical & Computer Engineering Faculty Publications

In the transient phase of an atmospheric pressure discharge, the avalanche turns into a streamer discharge with time. Hydrodynamic fluid models are frequently used to describe the formation and propagation of streamers, where charge particle transport is dominated by the creation of space charge. The required electron transport data and rate coefficients for the fluid model are parameterized using the local mean energy approximation (LMEA) and the local field approximation (LFA). In atmospheric pressure applications, the excited species produced in the electrical discharge determine the subsequent conversion chemistry. We performed the fluid model simulation of streamers in nitrogen gas at …

Grain Boundary Engineering: An Emerging Pathway Toward Efficient Electrocatalysis, Xiaomin Xu, Yijun Zhong, Magdalena Wajrak, Tejas Bhatelia, San Ping Jiang, Zongping Shao

Research outputs 2022 to 2026

Electrochemical transformation processes involving carbon, hydrogen, oxygen, nitrogen, and small-molecule chemistries represent a promising means to store renewable energy sources in the form of chemical energy. However, their widespread deployment is hindered by a lack of efficient, selective, durable, and affordable electrocatalysts. Recently, grain boundary (GB) engineering as one category of defect engineering, has emerged as a viable and powerful pathway to achieve improved electrocatalytic performances. This review presents a timely and comprehensive overview of recent advances in GB engineering for efficient electrocatalysis. The beneficial effects of introducing GBs into electrocatalysts are discussed, followed by an overview of the synthesis …

The Phase Behaviour And Stability Of An Environmentally Friendly Oil-In-Water Emulsion Produced Using Balanites Aegyptiaca Oil And Green Emulsifiers, Sami A.M. Yagoub, Swee P. Yeap, Nurudeen P. Yekeen, Mohammed A. Ayoub

Research outputs 2022 to 2026

Due to environmental concerns about extensively using chemical emulsifiers and hydrocarbon oil in emulsion systems formation, recent research has shifted to using natural emulsifiers and oil. This study produced green emulsion using Balanites aegyptiaca oil and various bio-emulsifiers (such as sodium alginate, carboxymethylcellulose, guar gum, and Saponin). Phase behavior and stability of the emulsion were tested at different NaCl concentrations over one month of ageing. The emulsion was also produced using Balanites aegyptiaca oil and synthetic emulsifiers (Tween 80 and Triton X-100). The critical micelle concentrations of emulsifiers were determined and used as the fixed concentration for the green emulsion …

Direct Blue 86 Textile Dye Removal From Aqueous Solution Using Rice Husk-Based Adsorbent, M. Zulbahari M. Zua, Muhammad Raza Ul Mustafa, Mohamed Hasnain Isa, Teh Sabariah Binti Abd Manan, Naimah Ibrahim, Rozeana Hj Md Juani, Wida Susanty Hj Suhaili, Asmaal Muizz Sallehhin Bin Hj Mohammad Sultan, Zuliana Binti Hj Nayan

ASEAN Journal on Science and Technology for Development

Adsorption by activated carbon is an effective method of dye removal. However, due to high production and regeneration costs of activated carbon, various studies on low-cost adsorbents have been conducted. Agricultural waste such as rice husk (RH) is seen to be a good adsorbent for dye removal. Moreover, rice husk is readily available. In this study, rice husk-based adsorbents were prepared by chemical and thermal treatments. Standard curve (colour vs absorbance) for Direct Blue 86 (DB 86) was prepared to determine the concentration of dye before and after adsorption. The adsorption potential of the adsorbent for textile dye DB 86 …

Advancing Natural Hydrogen Exploration: Headspace Gas Analysis In Water-Logged Environments, Krista Davies, Lionel Esteban, Alireza Keshavarz, Stefan Iglauer

Research outputs 2022 to 2026

Natural hydrogen has gained prominence as a potential contributor to the low-carbon energy landscape; however, exploration techniques are still evolving. Current methods primarily rely on dry soil gas studies or gas vent measurements. Because gas vents are scarce and groundwater inhibits hydrogen gas flux from the soil, other field detection techniques are necessary. This research paper presents a novel approach for advancing natural hydrogen exploration through the analysis of headspace gas of agitated groundwater extracted from dedicated shallow boreholes to better estimate the hydrogen gas flux and its variations with time. Several shallow boreholes were drilled in Western Australia on …

Assessing The Feasibility And Mechanism Of Destructive Removal Of Per- And Polyfluoroalkyl Substances (Pfas) From Water, Kaushik Vinaykumar Londhe

Dissertations

One of the most pertinent challenges faced by the drinking water community is the widespread contamination of per- and polyfluoroalkyl substances (PFAS). These anthropogenic chemicals have been ubiquitously used in everyday products such as carpets, stain repellents, dyes, shampoos, non-stick cookware as well as in aqueous firefighting foams. PFAS are linked with adverse health effects in humans such as thyroid disease, obesity, immunological and reproductive disorders and linked to cancer in adults and low birth weight and developmental defects in infants.

Conventional water treatment technologies have proven to be largely ineffective in PFAS remediation, due to their extreme stability and …

Classification Of Oil Products According To The Nomenclature Of Goods, Kurbankul Mavlankulovych Karimkulov Profesor, Azoda Abdurahmanova

Technical science and innovation

The article analyzes types of vegetable oils. Simple methods of determining their quality using liquid gas chromatography have been developed. Recommendations for improving the classification of foreign economic activity based on commodity nomenclature were developed and recommended for customs operations. “Fats and oils of animal, vegetable or microbiological origin and products of their breakdown; prepared edible fats; waxes of animal or vegetable origin” was called. Animal fats, including pork, beef, sheep, goat, fish and oils of animals such as marine mammals are classified according to the Nomenclature of Foreign Economic Activities of the Republic of Uzbekistan in commodity headings 1501-1506 …

Advancing Polymer Sustainability Through Custom Interpenetrating Polymer Network Synthesis, Processing, And Design, Alexandra Maria Lehman-Chong

Theses and Dissertations

The need for improving polymer sustainability is as ubiquitous as the role of polymers in modern society. Interpenetrating polymer network (IPN) design flexibility offers opportunities for improved polymer sustainability while balancing desired polymer properties for various applications. This work investigates the structure-property-processing relationships of IPNs judiciously designed under the framework of the polymer life cycle. Sustainable polymer design was largely considered at the feedstock and manufacturing stages while considering overall polymer performance. Chemicals from bio-based feedstocks were used to design a full simultaneous polybenzoxazine-epoxy IPN, focusing on the effects of monomer and polymer structure on polymer properties. Processing-property relationships were …

Reducing Food Scarcity: The Benefits Of Urban Farming, S.A. Claudell, Emilio Mejia

Journal of Nonprofit Innovation

Urban farming can enhance the lives of communities and help reduce food scarcity. This paper presents a conceptual prototype of an efficient urban farming community that can be scaled for a single apartment building or an entire community across all global geoeconomics regions, including densely populated cities and rural, developing towns and communities. When deployed in coordination with smart crop choices, local farm support, and efficient transportation then the result isn’t just sustainability, but also increasing fresh produce accessibility, optimizing nutritional value, eliminating the use of ‘forever chemicals’, reducing transportation costs, and fostering global environmental benefits.

Imagine Doris, who is …

Algorithms For Synthesis Of Adaptive Control Systems With A Customized Model Using The Speed Gradient Method, Jasur Sevinov, Oxunjon Boborayimov

Chemical Technology, Control and Management

Algorithms are considered for the synthesis of adaptive control systems with a customized model based on the speed gradient method. For the synthesis of adaptive control systems, the identification approach is based on obtaining estimates of the unknown parameters in the object. By calculating the speed gradient, identification algorithms with an explicit and implicit customized model were obtained as well as that in sliding modes. A joint solution is given to the interrelated problems of identifying parameters with insufficient current information. The position of an object is about assessing the state with insufficient a priori information about its parameters. This …