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2020

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Articles 661 - 669 of 669

Full-Text Articles in Chemical Engineering

Effect Of Molecular Sieve Addition On Methanol Synthesis From Co2 And H2 Through Alcohol Assisted Method Over Cu/Zno Catalyst, Tanawut Boonamnuay Jan 2020

Effect Of Molecular Sieve Addition On Methanol Synthesis From Co2 And H2 Through Alcohol Assisted Method Over Cu/Zno Catalyst, Tanawut Boonamnuay

Chulalongkorn University Theses and Dissertations (Chula ETD)

Low-temperature methanol synthesis from CO2 and H2 was carried out using ethanol as catalytic solvent. The alcohol-assisted method reduced synthesis temperature and enhanced methanol yield (35.8%) at 150 oC (5.0 MPa, Cu/ZnO catalyst). However, ethyl acetate and water were generated as byproducts from the reaction. The byproducts formed azeotrope mixture with methanol and led to a complex product purification. Therefore, in this study, molecular sieves (MS) were introduced to adsorb the byproducts. The effect of different MS (3A and 5A) was studied. It was found that MS helped enhancing methanol yield. The highest methanol yield (42.6%) was obtained when adding …

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Process Analysis And Economic Evaluation Of Acetaldehyde Production From Ethanol Via Non-Oxidative Dehydrogenation, Thanakarn Suthirojn Jan 2020

Process Analysis And Economic Evaluation Of Acetaldehyde Production From Ethanol Via Non-Oxidative Dehydrogenation, Thanakarn Suthirojn

Chulalongkorn University Theses and Dissertations (Chula ETD)

At present, there is an awareness of global warming. The use of combustion fuel in cars is another cause of carbon dioxide emission which can caused global warming. As a result, electric vehicles (EV) have a greater role in the world Including Thailand, resulting in lower fuel consumption. For this reason, the demand for ethanol may decreased. Due to the higher price and wide range of applications, it is interesting to find alternatives to convert ethanol into acetaldehyde in this work. In this research, Aspen plus will be utilized for the process simulation and economic evaluation of two processes by …

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Analysis Of Mass Transfer Coefficient Of Co2 Absorbed By Two-Component Amine Mixture In A Packed Bed Column, Thanakornkan Limlertchareonwanit Jan 2020

Analysis Of Mass Transfer Coefficient Of Co2 Absorbed By Two-Component Amine Mixture In A Packed Bed Column, Thanakornkan Limlertchareonwanit

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, coal fired plant has an important role in generating energy all over the world. It affects to greenhouse gases effect (GHGs) and global warming. Carbon dioxide (CO2) is a product of coal combustion that is the amount of number one in the world. However, most of the CO2 usually remove from post-combustion process by chemical absorption which is Monoethanolamine (MEA). Anyway, MEA has a disadvantage such as low CO2 loading and corrosion. Therefore, this study needs to investigate the effect of the mass transfer for a new solvents, 2-(Methylamino)ethanol (2-MAE) and Dimethylaminoethanol (DMAE), compensate for the drawbacks of MEA …

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Synthesis Of Alkane From Lauric Acid Via Electrochemical Reaction In Microreactor, Thantip Kiattinirachara Jan 2020

Synthesis Of Alkane From Lauric Acid Via Electrochemical Reaction In Microreactor, Thantip Kiattinirachara

Chulalongkorn University Theses and Dissertations (Chula ETD)

In the present work, decarboxylation of lauric acid to undecane was conducted by Kolbe electrochemical oxidation process in a microreactor. The microreactor is widely used to study reaction kinetics as well as reaction mechanisms because of negligible heat and mass transfer resistances within the reactor. The reactor is also very effective in the control of residence time. The 250-micron thick reactor was formed between graphite anode and stainless steel cathode sheets. Reactive alkyl radicals were produced from the supplied electrical potential and their combination with proton produced alkane with the release of carbon dioxide. The experiments were conducted to study …

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Effect Of Cocatalyst Combination In Titanium-Based Ziegler-Natta Catalyst On Olefin Polymerization, Thanyaporn Pongchan Jan 2020

Effect Of Cocatalyst Combination In Titanium-Based Ziegler-Natta Catalyst On Olefin Polymerization, Thanyaporn Pongchan

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research focused on effect of cocatalyst types (TEA, TnOA, and TEA+TnOA) on titanium-based Ziegler-Natta catalyst in olefin polymerization both in slurry and gas-phase systems. This study has been divided into four sections. The commercial titanium-based catalyst was selected to investigate effect of reaction temperature and oxidation state of titanium from ESR measurement on slurry ethylene and propylene polymerization in the first and the second parts, respectively. The commercial catalyst with TEA exhibited the highest activity in ethylene polymerization. However, divalent, and trivalent of titanium (Ti2+ and Ti3+) was active in ethylene polymerization to produce more polymer. Stability of Ti3+ …

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Preparation And Characterization Of Ceramic Nanofiltration Membrane Prepared From Hazardous Industrial Waste, Shereen Kamel Amin, Mai Hassan Roushdy, Heba Mohamed Abdallah, Ahmed Mostafa, Magdi Fouad Abadir Jan 2020

Preparation And Characterization Of Ceramic Nanofiltration Membrane Prepared From Hazardous Industrial Waste, Shereen Kamel Amin, Mai Hassan Roushdy, Heba Mohamed Abdallah, Ahmed Mostafa, Magdi Fouad Abadir

Chemical Engineering

Kiln rollers, which are widely used in ceramic tiles production, are usually subjected to surface grinding to remove the contaminations. The resulted fine powder is considered useless waste and a hazardous source of environmental pollution particularly as it contains health‐threatening fine free silica. In the present paper, the grind waste from kiln rollers was reused as raw material in the fabrication of nanofiltration cerramic membrane. The samples of produced ceramic membranes were formed into disks by adding 15% (by weight) organic binder solution with 2% concentration, then pressed at 35 MPa, dried and fired at temperatures range from 1100°C to …

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Effect Of The Electrodeposition Potential Of Platinum On The Catalytic Activity Of A Pt/Gc Catalyst Toward Formic Acid Electro−Oxidation, Islam M. Al-Akraa, Bilquis A. Al-Qodami Ms., Ahmad M. Mohammad Prof Jan 2020

Effect Of The Electrodeposition Potential Of Platinum On The Catalytic Activity Of A Pt/Gc Catalyst Toward Formic Acid Electro−Oxidation, Islam M. Al-Akraa, Bilquis A. Al-Qodami Ms., Ahmad M. Mohammad Prof

Chemical Engineering

The electrocatalytic activity of platinum (Pt)–modified glassy carbon (GC) (referred as Pt/GC) electrodes toward the formic acid electro−oxidation (FAO) was investigated. The Pt deposition on the GC substrate was carried out by a potentiostatic technique at different potentials (from 0.2 V to −0.2 V vs. Hg/Hg2Cl2/KCl (sat.) reference electrode) and the corresponding influence on the catalytic activity toward FAO was monitored. The electrocatalytic inspection revealed a potential role for the Pt deposition potential in boosting the catalytic efficiency of the catalyst toward FAO and further in mitigating the CO poisoning that eventually deactivate the catalyst. Interestingly, the highest activity toward …

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A Spin-Coated Tiox/Pt Nanolayered Anodic Catalyst For The Direct Formic Acid Fuel Cells, Islam M. Al-Akraa, Ahmad M. Mohammad Prof Jan 2020

A Spin-Coated Tiox/Pt Nanolayered Anodic Catalyst For The Direct Formic Acid Fuel Cells, Islam M. Al-Akraa, Ahmad M. Mohammad Prof

Chemical Engineering

The CO poisoning of the platinum anodic catalyst which typically functions the catalytic deterioration of the direct formic acid fuel cells could be minimized with a simple modification for Pt with titanium oxide. The fabrication scheme involved the spin-coating of a Ti precursor onto a Pt thin layer that was physically sputtered onto a Si substrate. The whole assembly was subjected to a post-annealing processing to produce the TiOx layer (60 nm) in a porous structure (mostly Anatase) atop of the Pt surface. The porous nature of the TiOx layer permitted the participation of Pt in the electrocatalysis of the …

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Development Of Novel Adsorbent For Industrial Waste Water Treatment, Hassaan M. Shehata, Dalia A. Ali, Islam M. Al-Akraa Dr, Hany A. Elazab, Hoda A. Elsawy Dr Jan 2020

Development Of Novel Adsorbent For Industrial Waste Water Treatment, Hassaan M. Shehata, Dalia A. Ali, Islam M. Al-Akraa Dr, Hany A. Elazab, Hoda A. Elsawy Dr

Chemical Engineering

The main objective of this research project is to perform some experimental procedures to inform the ability of the novel adsorbent used in this project. The chemical modification of the adsorbent is the chemical oxidation of pure powder chitosan using some specific redox pairs which are potassium dichromate and sodium bisulphite. After preparing the modified chitosan, there are some parameters that must be discussed during the adsorption process. The first parameter is the time parameter, showing experimentally the optimum time for adsorption under certain conditions by collecting values of absorbance and concentration of thymol blue adsorbed after the process from …

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