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Articles 6451 - 6480 of 14185

Full-Text Articles in Engineering

Hydrogen Production From Biogas By The Combined Process Of Chemical Looping Water Splitting And Sorption Enhanced Reforming Process: Process Analysis And Design, Natthaporn Saithong Jan 2017

Hydrogen Production From Biogas By The Combined Process Of Chemical Looping Water Splitting And Sorption Enhanced Reforming Process: Process Analysis And Design, Natthaporn Saithong

Chulalongkorn University Theses and Dissertations (Chula ETD)

The integrated sorption-enhanced chemical looping reforming and water splitting (SECLR-WS) process was proposed for hydrogen (H2­­) production from biogas using iron oxide as the oxygen carrier and calcium oxide (CaO) as a carbon dioxide (CO2) adsorbent. The simulation of the SECLR-WS process was based on a thermodynamic approach and was performed using an Aspen Plus simulator. The sensitivity results showed that the H2 yield (mole of H2/mole of CH4), H2 purity in the fuel reactor (FR), and CH4 conversion could be improved by increasing the steam feed to the FR to CH4 (SFR/CH4) and CaO to CH4 (CaO/CH4) molar ratios. …

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Improving Fouling Resistance Of Thin Film Composite Membranes By Addition Of Tio2, Palach Kedchaikulrat Jan 2017

Improving Fouling Resistance Of Thin Film Composite Membranes By Addition Of Tio2, Palach Kedchaikulrat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Polyamide thin film nanocomposite (TFN) membranes with the addition of titanium dioxide (TiO2) nanoparticles (NPs) were synthesized via an interfacial polymerization (IP) on polyacrylonitrile (PAN) support. Also, the TFC membranes with addition of individual components in the TiO2 colloidal solution, ethanol, TiO2 NPs and nitric acid, were individually studied. The performances of the fabricated membranes were evaluated in terms of NaCl salt rejection, water permeability and anti-fouling capability. Membranes characterizations were conducted to observe various characteristics of membranes such as morphology, surface roughness, surface chemistry and hydrophilicity. The results revealed that the addition of TiO2 colloidal solution in aqueous amine …

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Determination Of Mass Transfer Coefficient Of Co2 In Solutions Of Monoethanolamine, 2-(Methylamino)Ethanol And Dimethylaminoethanol In Packed Absorption Column, Parintorn Vaewhongs Jan 2017

Determination Of Mass Transfer Coefficient Of Co2 In Solutions Of Monoethanolamine, 2-(Methylamino)Ethanol And Dimethylaminoethanol In Packed Absorption Column, Parintorn Vaewhongs

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study, mass transfer of two new solvents, 2-MAE and DMAE were studied with various factors affecting mass transfer coefficient in comparison with MEA. Effect of solvent types, CO2 inlet loading 0.0, 0.1 and 0.2 mol/mol, solvent concentration 3, 4 and 5 kmol/m3, solvent flow rate 5.3, 10.6 and 15.9 m3/(m2·h) and CO2 content 13-15 v/v% in gas feed were investigated. In all cases, 2-MAE performed highest mass transfer rate among others. The highest mass transfer rate was 1.2656 kmol/(kPa·h·m3) for the case that CO2 inlet loading 0.0 mol/mol, solvent concentration 3 kmol/m3, solvent flow rate 10.6 m3/(m2·h) and …

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Development Of Starch-Nanocellulose Composites For Using In Surface Treatment Of Paper, Phanthakan Ow Jan 2017

Development Of Starch-Nanocellulose Composites For Using In Surface Treatment Of Paper, Phanthakan Ow

Chulalongkorn University Theses and Dissertations (Chula ETD)

The main role of surface sizing is to increase the surface strength of paper. Starch is commonly used as surface sizing agents, but there are still some limitations. In this study, nano-bacterial cellulose (NBC) produced by Acetobacto xylinum was used as a reinforcing material in starch-based composites. The suspensions of NBC starch-based composites were prepared by the additions of 0.10-10.00% w/w NBC into starch solution and were used as surface sizing agents. The structures and properties of NBC starch-based composite films were characterized by FTIR, XRD, and SEM. The mechanical properties and barrier properties of cellulosic paper with surface sizing …

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Continuous Hydrotreating Process Of Palm Fatty Acid Distillate (Pfad) Over Bimetallic Nicu/Hzsm-5 Catalyst For Bio Jet Fuel Production, Phisit Wirikulcharoen Jan 2017

Continuous Hydrotreating Process Of Palm Fatty Acid Distillate (Pfad) Over Bimetallic Nicu/Hzsm-5 Catalyst For Bio Jet Fuel Production, Phisit Wirikulcharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research investigated bimetallic NiCu/HZSM-5 catalyst for the production of bio jet fuel via hydrotreating process. The catalysts with different Ni and Cu ratio were characterized by XRD, NH3-TPD, H2-TPR, SEM-EDX and N2-physisorption techniques. Palm fatty acid distillate (PFAD), nonedible by-product from palm oil refining process, was employed as a low-cost feedstock. For catalyst screening, the reaction was performed in an autoclave reactor under batch operation with operating temperature of 375°C, initial H2 pressure of 50 bars and reaction time of 3 h. The results showed that doping Cu could enhance deoxygenation activity while carbon formation was found to be …

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Preparation Of Stable Hydrothermal Carbon-Based Catalyst From Defatted Rice Bran And Glucose For Biomass Conversion To 5-Hydroxymethylfurfural, Piyaporn Wataniyakul Jan 2017

Preparation Of Stable Hydrothermal Carbon-Based Catalyst From Defatted Rice Bran And Glucose For Biomass Conversion To 5-Hydroxymethylfurfural, Piyaporn Wataniyakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research investigated the preparation of hydrothermal carbon-based catalysts (HTC-SO3H) derived from defatted rice bran (DRB) and glucose for biomass conversion to 5-hydroxymethylfurfural (HMF). Firstly, the effects of hydrothermal carbonization conditions: temperature (180-250 °C) and time (1-8 h) on the yield and the chemical characteristics of the hydrothermal carbons (HTCs) were investigated. The HTCs were then sulfonated with sulfuric acid to obtain HTC-SO3H catalysts. The stability of the catalysts was evaluated based on the amount of biomass conversion products leached into the water at a specified biomass conversion condition. Since no HMF and furfural, and only small amounts of levulinic …

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Effects Of Titania Phase And Tungsten Loading Content In W/Tio2 Catalysts On Dehydration Of Ethanol To Diethyl Ether, Pongsatorn Kerdnoi Jan 2017

Effects Of Titania Phase And Tungsten Loading Content In W/Tio2 Catalysts On Dehydration Of Ethanol To Diethyl Ether, Pongsatorn Kerdnoi

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, ethanol which is one of the most used renewable energies can be converted into the more valuable compounds. It was reported that titania-supported tungsten (W/TiO2) catalyst is able to convert ethanol into diethyl ether. However, titania support has different crystalline phases that can result in differences of physicochemical properties for the catalyst. Therefore, the present work reports on the catalytic behaviors of both different phases of titania and tungsten loading contents in catalytic ethanol dehydration to diethyl ether. To prepare the catalysts, the three different phases [anatase (A), rutile (R), and mixed phases (P25)] of titania supports were impregnated …

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Modification Of Titanium Dioxide With Nitrogen, Silicon, And Carbon For Visible Light Photocatalysis, Rachan Klaysri Jan 2017

Modification Of Titanium Dioxide With Nitrogen, Silicon, And Carbon For Visible Light Photocatalysis, Rachan Klaysri

Chulalongkorn University Theses and Dissertations (Chula ETD)

Titanium dioxide and nitrogen-silicon-codoped titanium dioxide were prepared by two different ways. The first method was prepared by using nitrogen as a nitrogen source and silicon-containing chemical as a silicon source via solvothermal- and sol-gel-made photocatalysts. The nitrogen-silicon-codoped titanium dioxide showed the highest photocatalytic activity under both UV and visible light irradiation. The addition of silicon resulted in the formation of partial monolayer of silicon on titanium dioxide and an increase of the anatase phase stability. The annealing atmosphere affected the distribution concentration of surface and interface species such as surface oxygen and Ti3+ sites, thus improving photocatalytic activity. Moreover, …

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A Study Of Catalyst Type And Dispersion On Pyrolysis Of High Density Polyethylene, Ratchanon Chantanuson Jan 2017

A Study Of Catalyst Type And Dispersion On Pyrolysis Of High Density Polyethylene, Ratchanon Chantanuson

Chulalongkorn University Theses and Dissertations (Chula ETD)

The study of catalyst type and dispersion on pyrolysis of high density polyethylene (HDPE) was investigated in batch and semi-batch reactor system. The separation system in semi-batch was rapidly separated between oil and gas products while in batch system was separated after cooling down process. The obtained oil products in semi-batch system had higher in short-chain hydrocarbon. Because the increased pressure and the high severity in batch system led to occur side reactions. Two types of catalyst were studied, Cat A was acid catalyst with 200 m2/g surface area and 20 A average pore diameter and HZSM-5 zeolite was stronger …

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Effect Of Amino Propanol Structure On Carbon Dioxide Absorption, Rossukon Nimcharoen Jan 2017

Effect Of Amino Propanol Structure On Carbon Dioxide Absorption, Rossukon Nimcharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Currently, global warming is the main issue on environmental concern due to the higher amount of carbon dioxide (CO2) in the atmosphere.The current technology to remove CO2 effectively is carbon capture and storage or CCS, especially absorption with aqueous amine solutions. The commonly used amine solutions are monoethanolamine (MEA). They have some disadvantages like low capacity. Therefore, a new solvent such as 3-amino-1-propanol (3A1P), 3-dimethylamino-1-proapnol (3DMA1P) and 1-dimethylamino-2-proapnol (1DMA2P) have been designed to be used as alternative solvents for CO2 removal. In this work, the solubility of carbon dioxide in new promising solvents. The effect of solvent concentration is studied …

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Improving The Efficiency Of Dye-Sensitized Solar Cells With Spray-Coated Tio2 Electrode Modified By Cuo, Nio, Or In2o3, Sakun Preedavijitkul Jan 2017

Improving The Efficiency Of Dye-Sensitized Solar Cells With Spray-Coated Tio2 Electrode Modified By Cuo, Nio, Or In2o3, Sakun Preedavijitkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research investigated the application of the CuO/TiO2, NiO/TiO2, or In2O3/TiO2 thin film electrode in dye-sensitized solar cells (DSSCs). Second metal oxide and TiO2 sols were synthesized separately via sol-gel methods. The sols were mixed and sprayed onto the fluorine-doped tin oxide glass substrates. The amount of second metal oxide added to TiO2 was varied at 0, 0.1, 0.5, 1.0, and 3.0%wt. The electrode layer was sintered at 400˚C for two hours. The addition of CuO, NiO, and In2O3 produced the photovoltaic efficiency of the cell 4.03±0.58% with 0.1%wt. CuO/TiO2, 5.17±0.07% with 0.5%wt. NiO/TiO2, and 6.21±0.87% with 1.0%wt. In2O3/TiO2, respectively. …

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Comparison Of Zsm - 5 And Poss Nanocomposite Pervaporation Membranes For Furfural/Water Separation, Seth Sawatdiruk Jan 2017

Comparison Of Zsm - 5 And Poss Nanocomposite Pervaporation Membranes For Furfural/Water Separation, Seth Sawatdiruk

Chulalongkorn University Theses and Dissertations (Chula ETD)

The recovery of furfural via a conventional separation technology like distillation and solvent extraction requires very large energy consumption and high amount of chemical solvent. Thus, there is a need for an alternative separation process that is economic and more energy friendly for the furfural recovery. Pervaporation is a well - recognized energy friendly and effective separation tool. If there is suitable pervaporation membrane with efficient separation performance, the pervaporation can be a promising replacement for the conventional separation method. Therefore, this thesis aims to develop a suitable membrane for furfural recovery via pervaporation process. In this work, the polydimethylsiloxane …

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Development Of Graphite/Graphene/Carbon Nanotubes Filled Benzoxazine Composites For Bipolar Plates In Fuel Cell Applications, Sirawit Witpathomwong Jan 2017

Development Of Graphite/Graphene/Carbon Nanotubes Filled Benzoxazine Composites For Bipolar Plates In Fuel Cell Applications, Sirawit Witpathomwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aims to develop bipolar plate from polymer composite to be used in proton exchange membrane fuel cells. The key properties of bipolar plates include high thermal conductivity, high electrical conductivity, high flexural strength and modulus, and low water absorption. The polybenzoxazine composites having three types of carbon derivatives i.e. graphite, graphene, and carbon nanotubes were prepared using a compression molder with a pressure of 15 MPa and a temperature of 200oC for 2 hours. The effects of carbon nanotube contents varying from 0-2wt% at an expense of graphite with constant content of graphene and benzoxazine at 7.5 and …

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Effect Of Palm Fatty Acid Distillate On Hydrodesulfurization And Hydrodeoxygenation In Co-Processing With Petroleum Gas Oil In Hydrotreating Unit, Sunya Boonyasuwat Jan 2017

Effect Of Palm Fatty Acid Distillate On Hydrodesulfurization And Hydrodeoxygenation In Co-Processing With Petroleum Gas Oil In Hydrotreating Unit, Sunya Boonyasuwat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Deoxygenation of palm fatty acid distillate (PFAD) to produce renewable diesel had been experimented in co-processing with petroleum light gas oil (LGO) in a pilot-scale reactor. The reaction was achieved in the fixed-bed hydrotreating reactor, over commercial CoMo/Al2O3 under 280-350 oC, 25 barg, H2/feed of 630 Nm3/m3 and 0.75 h-1 of LHSV. High conversion were achieved when varied PFAD up to 25 wt%. The presence of PFAD in LGO improved cetane index of the liquid products. Heat effect due to overall exothermic reactions was observed. Hydrogen consumption was then theoretically calculated and extrapolated for hydrotreating of pure PFAD. Further study …

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The Effect Of Adsorption On Photocatalytic Degradation Of Phenyl Urea Herbicides On Zinc Oxide, Sutaporn Meephon Jan 2017

The Effect Of Adsorption On Photocatalytic Degradation Of Phenyl Urea Herbicides On Zinc Oxide, Sutaporn Meephon

Chulalongkorn University Theses and Dissertations (Chula ETD)

The effect of adsorption on photocatalytic degradation was studied by using zinc oxide with different morphologies and exposed surfaces as the photocatalyst. Polar zinc-terminated surface and polar oxygen-terminated surface are dominating planes on the top and bottom of a crystal of ZnO conventional particles, while non-polar surface is the main plane on the side of ZnO nanorods. These surfaces affect the adsorption behavior of phenylurea herbicides, i.e. diuron, linuron and 3,4-dichloroaniline. Consequently, they cause the difference in photocatalytic degradation rate and intermediate products formed during the degradation. The adsorption capacity of ZnO conventional particles is about twice as high as …

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Performance Comparison Of Multifunctional Reactors For Biodiesel Production From Transesterification Of Palm Oil, Tanutporn Laosuttiwong Jan 2017

Performance Comparison Of Multifunctional Reactors For Biodiesel Production From Transesterification Of Palm Oil, Tanutporn Laosuttiwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Biodiesel is classified as a qualified alternative energy that can be used for diesel engine. It is produced via transesterification of vegetable oil with alcohol in presence of homogeneous or heterogeneous catalyst. However, oil and alcohol are not totally miscible leading to slow reaction rate. Multifunctional reactors, especially cavitational reactors, are proposed to overcome this issue. The cavitational reactors include ultrasonic reactor and homogenizer reactor. In this work, ultrasonic reactor, homogenizer reactor and conventional magnetic stirred reactor were used to investigate and compare biodiesel yield and the efficiency in terms of biodiesel yield based on the energy consumption at different …

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Effects Of Modification Of Γ-Al2o3 Support By La And Ce On Pt Dispersion And Oxygen Mobility For Co Oxidation, Thanawat Wandondaeng Jan 2017

Effects Of Modification Of Γ-Al2o3 Support By La And Ce On Pt Dispersion And Oxygen Mobility For Co Oxidation, Thanawat Wandondaeng

Chulalongkorn University Theses and Dissertations (Chula ETD)

Effects of La or Ce modified Pt/γ-Al2O3 catalysts on Pt dispersion and oxygen mobility of catalyst were investigated by CO oxidation reaction. 0, 0.01, 0.05, 0.10 and 0.15 molar ratio of La or Ce to Al was doped on Pt/γ-Al2O3 catalysts (0.3wt%Pt) by impregnation method. The CO oxidation activities in terms of light-off temperature (T50) and turnover frequencies (TOF) corresponded to Pt dispersion, oxygen mobility as characterized by various analytical techniques such as X-ray diffraction (XRD), N2-physisorption, CO-pulse chemisorption, and temperature programed desorption of CO2 (CO2-TPD). The results indicated that the addition of La on Pt/γ-Al2O3 catalysts increased the dispersion …

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Effect Of Operating Variables Of Corona Discharge Reactor Onbenzene Removal Efficiency, Thanunwut Thanahirunthitichote Jan 2017

Effect Of Operating Variables Of Corona Discharge Reactor Onbenzene Removal Efficiency, Thanunwut Thanahirunthitichote

Chulalongkorn University Theses and Dissertations (Chula ETD)

Volatile organic compound (VOC) has been known as one of air pollutants generated by the fast growth of industry and social development. There were many kind of VOC which is harmful for humans and environments. All concerned organization requested controlling of these problems. As a result, there were many technologies developed for handling and degrading such VOC. Among these technologies, corona discharge reactor has been known as a promising means because of its effectiveness and compactness. In this work, benzene was selected as a model VOC pollutant. Performance of multi-channeled corona discharge reactor for removal of benzene was experimentally examined …

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Chromatographic Separation Of Free Lutein And Fatty Acids In De-Esterified Marigold Oleoresin And Its Mathematical Modelling, Weerawat Clowutimon Jan 2017

Chromatographic Separation Of Free Lutein And Fatty Acids In De-Esterified Marigold Oleoresin And Its Mathematical Modelling, Weerawat Clowutimon

Chulalongkorn University Theses and Dissertations (Chula ETD)

The petal of marigold flowers has been reported to be the richest source of a xanthophyll, namely lutein which exhibits strong antioxidant and anticancer properties. Although large amount of lutein can be obtained, the compound in the flowers exists as esterified lutein, which is not readily bio-available. As a result, a number of separation and purification steps are required after solvent extraction of marigold flowers. One of the key steps is de-esterification of lutein fatty acid esters in the extract, or namely marigold oleoresin, by the reaction of the oleoresin with alkali solution, e.g., KOH, to obtain free lutein. The …

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Coal Combustion Products Utilization For Soil Amendment, Tran Thi Anh Tuyet Jan 2017

Coal Combustion Products Utilization For Soil Amendment, Tran Thi Anh Tuyet

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, coal has a crucial role in generating energy all over the world. As a result, the consumption of coal creates a huge amount of coal combustion products, including bottom ash and fly ash. The coal ash has the potential characteristics to become a resource material in agriculture such as its texture, water holding capacity, bulk density, pH etc., and contains almost all the essential plant nutrients. However, most of the coal ash created is dumped into the landfill, which is a contributing factor in the environmental degradation. This study wants to use coal ash in agriculture as a way …

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Time Series Pattern Discovery Techniques For Well-To-Well Log Correlation, Chanchai Apiwatsakulchai Jan 2017

Time Series Pattern Discovery Techniques For Well-To-Well Log Correlation, Chanchai Apiwatsakulchai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Well log data is one of the most abundant data sources for subsurface characterization since almost all drilled wells are logged. Subsurface characterization requires correlated well log information. Processes to help perform well-to-well log correlation have been developed in this study based on the two approaches: pattern matching and pattern discovery. Pattern matching focuses on finding a known pattern of interest in uncorrelated wells. The use of Euclidean, Hamming, and Levenshtein distances in similarity measurement, Piecewise Aggregate Approximation (PAA), and Symbolic Aggregate approXimation (SAX) data representation helps create reduced-resolution while maintains the main characteristics of the signals. Multi-resolution analysis provides …

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Assisted Methane Hydrate Formation With The Addition Of Promoters, Chutikan Jaikwang Jan 2017

Assisted Methane Hydrate Formation With The Addition Of Promoters, Chutikan Jaikwang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Natural gas hydrates play an important role in the largest reservoir of hydrocarbons on earth. The gas hydrates have received increasing attention in an excellent way of new technology for gas in large quantity storage and transportation. However, the main challenge to use methane hy¬drates has faced many challenges such as the slow formation rate, low growth rate during hydrate formation, and low conversion ratio of gas to solid hydrates leading to poor storage capacity. In this work, methane hydrate formation and dissociation in the presence of different Cyclopentane (CP), Tetra-n-butyl phosphonium bromide (TBPB) and Tetra-n-butyl ammonium bromide (TBAB) concentrations …

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Microbial Conversion Of Cellulose To Sugars By Bacterial Enzyme, Kessara Seneesrisakul Jan 2017

Microbial Conversion Of Cellulose To Sugars By Bacterial Enzyme, Kessara Seneesrisakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This work studied the conversion of lignocellulosic materials to sugars, the intermediates for bioethanol production, by a bacterial enzyme. Due to the complex structure of lignocellulose, a cellulase enzyme cannot effectively access and hydrolyse cellulose fibers. Various pretreatment processes of lignocellulose have been studied to enhance enzymatic hydrolysis to date. In this work, corncob was firstly studied for microbial pretreatment using three microorganisms including two bacterial strains of Bacillus subtilis A 002 and Cellulomonas sp. TISTR 784 and a fungal strain of Phanerochaete sordida SK7. The results showed that the microbial pretreatment with P. sordida SK7 was the most effective …

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Effects Of Bead Size And Concentration Of Unstable Asphaltenes Obtained From Different Centrifugation Techniques On Asphaltene Deposition In Packed Bed Apparatus, Kimchhay Lao Jan 2017

Effects Of Bead Size And Concentration Of Unstable Asphaltenes Obtained From Different Centrifugation Techniques On Asphaltene Deposition In Packed Bed Apparatus, Kimchhay Lao

Chulalongkorn University Theses and Dissertations (Chula ETD)

Asphaltenes are the heaviest and most polar fraction of petroleum crude oil. They are the collection of components that can be soluble in aromatics solvents such as benzene or toluene, but insoluble in normal alkanes, n-pentane, n-hexane, or n- heptane. Asphaltenes are a class of molecules consisted of grouped aromatic rings with alkane chains. Changing pressure, temperature, composition, and shear rate during transportation can cause precipitation and deposition, resulting in reduced reservoir productivity due to restricted flow lines, fouling and blockages in the pore spaces of the reservoir. The goal of this investigation is to assess validity of two aspects …

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Adsorptive Bubble Separation For Oil Removal, Paweena Kanokkarn Jan 2017

Adsorptive Bubble Separation For Oil Removal, Paweena Kanokkarn

Chulalongkorn University Theses and Dissertations (Chula ETD)

This present work emphasized on the current knowledge regarding (i) feasibility of multi-stage forth flotation operation for oil removal, and (ii) comprehension of dynamic surface tensions of surfactant solutions in relation to foam characteristics. A multi-stage forth flotation efficiency depends on the enhancement of interfacial adsorption and the number of bubble caps and tray. The operational parameters including foam height, air flow rate and feed flow rate were controlled to obtain the optimum process performance. Under the optimum conditions—a number of trays of 4, a foam height of 60 cm, an air flow rate of 40 L/min, a feed flow …

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Investigation Of Asphaltene Aggregation Kinetics In The Presence Of Water-In-Oil Emulsion, Penpitcha Roengsamut Jan 2017

Investigation Of Asphaltene Aggregation Kinetics In The Presence Of Water-In-Oil Emulsion, Penpitcha Roengsamut

Chulalongkorn University Theses and Dissertations (Chula ETD)

Asphaltene is a component of the petroleum liquid defined operationally. It represents the most refractory (or the heaviest fraction). It is well-known that changes in temperature, pressure, or composition can destabilize asphaltenes and cause aggregation and deposition in porous formations, production lines, and processing facilities (Sheu and Mullins 1995). This leads to the study of the behavior of asphaltene aggregation and parameters that could affect the rate of aggregation which, in this case, is water-in-oil emulsion. In addition, the asphaltene aggregation model derived by Haji-Akbari (2013) is applied as a framework in this study which explains the correlation between the …

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Study On Energy Storage Ability Of Zno/Tio2 For Photocatalytic Degradation Of Isopropanol, Ratchawan Jarumanee Jan 2017

Study On Energy Storage Ability Of Zno/Tio2 For Photocatalytic Degradation Of Isopropanol, Ratchawan Jarumanee

Chulalongkorn University Theses and Dissertations (Chula ETD)

The photocatalytic degradation of isopropanol under UV irradiation was studied by using p-n junction of ZnO/TiO2 photocatalysts prepared by sol-gel technique. Their energy storage ability was tested with their photocatalytic activity where there was no UV illumination. That was investigated by illumination the system with UV light for 2 h and off for 2 h until 8 h. The composition and surface structure of the catalyst were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area analysis, and particle size analysis. The change in the isopropanol concentration was observed by using gas chromatography. The result showed that the …

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Vegetable Oil Based Microemulsion Biofuels, U-Larak Peson Jan 2017

Vegetable Oil Based Microemulsion Biofuels, U-Larak Peson

Chulalongkorn University Theses and Dissertations (Chula ETD)

The growth of energy demand increases dramatically which has resulted in an increase of exhaust emissions to air quality deterioration. Therefore, there are driving forces in the development of renewable energy production technologies. Vegetable oils based reverse micelle microemulsions have been increased in attention for biofuel production. This work aims to formulate microemulsion biofuel containing palm oil/diesel blend as nonpolar phase, and ethanol/butanol, as a polar phase. The nonionic alcohol ethoxylate surfactant with the different numbers of EO groups, EOn (n=1, 3, 5, and 9) were selected as a stabilizing agent. A pseudo-ternary phase diagram was conducted to determine an …

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Improvement Of Life Cycle Assessment Software And Its Applications, Yodsathorn Chavewanmas Jan 2017

Improvement Of Life Cycle Assessment Software And Its Applications, Yodsathorn Chavewanmas

Chulalongkorn University Theses and Dissertations (Chula ETD)

LCSoft is Life Cycle Assessment (LCA) software which developed for perform LCA together with process design. It is a stand-alone tool with ability to be integrated with other process design tools such as process simulation software (PROII/ASPEN), economic analysis tool (ECON), and sustainable process design tool (SustainPro). In addition, several optional interpretation features are available such as, sensitivity analysis, alternative comparison, and eco-efficiency evaluation. In this research, LCSoft had been improved in performance and application range. The development framework consisted of four tasks. The first task deals with improvement of LCI and LCIA calculation which new pathway for calculation and …

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Methane Adsorption By Carbon Molecular Sieve Derived From Polycarbonate And Polyaniline, Jakchai Thawornwatthanasirikul Jan 2017

Methane Adsorption By Carbon Molecular Sieve Derived From Polycarbonate And Polyaniline, Jakchai Thawornwatthanasirikul

Chulalongkorn University Theses and Dissertations (Chula ETD)

The adsorptions of methane by carbon molecular sieves (CMS) were investigated at 35°C and 45°C by volumetric apparatus with the pressure range from 0 to 800 psia. CMS was prepared from polymer precursors such as polycarbonate (PC) and polyaniline (PANI) by carbonization under nitrogen inert atmosphere and activation by CO2 at temperature 700, 800 and 900°C. The yield of CMS is decreased with increasing carbonization and activation temperature. The methane adsorption capacity at 35°C of CMS derived from PC is 2.82 mmol CH4/g. The methane adsorption of the samples from PC is higher than those obtained from PANI for the …

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