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Full-Text Articles in Chemical Engineering
Microemulsion Formation Of Vegetable Oils Using Mixed Extended Surfactant For Cleaning Applications, Siriluk Jariyawattanarat
Microemulsion Formation Of Vegetable Oils Using Mixed Extended Surfactant For Cleaning Applications, Siriluk Jariyawattanarat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Some vegetable oils and animal fats can form semi-solid crystalline. The formation of semi-solid fats or waxy soils results in weak interactions between the oil and surfactant during the cleaning process. In this study, the anionic extended surfac-tant (C14-15, 8PO-SO4) systems were employed to form a middle phase microemul-sion with various vegetable oils (coconut, palm and soybean oil). The addition of nonionic extended surfactant (C16-18, 2PO-4EO-OH) in the mixed surfactant systems was also evaluated to observe the solubility enhancement of oil and water phase. The IFT value of formulated surfactant systems was measured to determine the optimum salinity. The Hydrophilic-Lipophilic …
Synthesis Of Magnetic Carbon Nanoparticles Using Pyrolysis Of Glycerol And Ferrocene For Antibiotic Removal, Konrat Kerdnawee
Synthesis Of Magnetic Carbon Nanoparticles Using Pyrolysis Of Glycerol And Ferrocene For Antibiotic Removal, Konrat Kerdnawee
Chulalongkorn University Theses and Dissertations (Chula ETD)
Synthesis of magnetic carbon nanoparticles (M-CNPs) via nebulizing co-pyrolysis of glycerol and ferrocene with magnetic induction was successfully conducted. Experimental investigation on influence of synthesizing temperature and ratio of glycerol to ferrocene suggested that at 800 °C of synthesizing temperature with an initial weight ratio of glycerol to ferrocene of 3:1, the highest M-CNP synthesizing yield of 15.9 % was achieved. With the presence of magnetic induction, controlled synthesis of M-CNPs could be anticipated as a promising method for producing M-CNPs with high quality and high yield. Oxy-tetracycline (OTC) has been recognized as environmental contamination due to its over-dosage and …
Development Of Conductive Polyimide/Polysulfone Composites As Positive Temperature Coefficient Materials, Noppawat Kuengputpong
Development Of Conductive Polyimide/Polysulfone Composites As Positive Temperature Coefficient Materials, Noppawat Kuengputpong
Chulalongkorn University Theses and Dissertations (Chula ETD)
For positive temperature coefficient (PTC) applications of electrically conductive composites, volume resistivity at room temperature of lower than 104 Ω.cm is one major requirement. Conductive polyimide (PI) PTC with the above level of conductivity value can be achieved by a use of carbon black (CB) as conductive filler. For materials with PTC, there is a change in resistance related to temperature. In order to reduce the amount of CB used in the PTC composites, one of well-known methods is to introduce another polymer into a polymer to generate immiscible blends. When the conductive filler is dispersed in one polymer phase, …
Performance Evaluation Of Integrated Co2 Huff-N-Puff And Wag In Low-Pressure Heterogeneous Reservoir, Hutthapong Yoosook
Performance Evaluation Of Integrated Co2 Huff-N-Puff And Wag In Low-Pressure Heterogeneous Reservoir, Hutthapong Yoosook
Chulalongkorn University Theses and Dissertations (Chula ETD)
The integrated CO2 Huff-n-Puff and WAG is a novel technique to combine CO2 Huff-n-Puff technique that conducted at early state and followed by WAG technique until the end of operating time. This technique is effectiveness in term of increased oil recovery and reduced CO2 utilization. However, the integrated CO2 Huff-n-Puff and WAG process contains numerous adjustable operating parameters. Hence, numerical simulation study and sensitivity analysis become essential to investigate the effects of main operational parameters and evaluate the performance of the integrated CO2 Huff-n-Puff and WAG process in low-pressure heterogeneous reservoir to achieve the maximum benefits. According to simulation results, …
Evaluation Of Captured Co2 And Waste H2 As Potential Feedstock For Methanol Production, Kankanit Kitsahawong
Evaluation Of Captured Co2 And Waste H2 As Potential Feedstock For Methanol Production, Kankanit Kitsahawong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Global warming is the critical issue that is the result of Greenhouse Gases (GHGs) emission. Carbon dioxide (CO2) is concerned to be major GHGs. Thus, Carbon dioxide utilization is the promising pathway to reduce the emission of CO2. To utilize CO2, waste hydrogen from sodium methoxide production is used to produce methanol which can be recycled as reactant of sodium methoxide synthesis. Carbon dioxide hydrogenation process is used for produce methanol from CO2 and waste H2 from various size of sodium methoxide production process. In every size of methanol production process, methanol which produce from the process is 16.3% of …
Catalytic Activity Of Cu-Ceo2zro2 For Biodiesel Production, Wasupon Wongvitvichot
Catalytic Activity Of Cu-Ceo2zro2 For Biodiesel Production, Wasupon Wongvitvichot
Chulalongkorn University Theses and Dissertations (Chula ETD)
CeO2-ZrO2 was synthesized by co-precipitation (CZ copre) and nanocasting (MSP CZ) methods for supporting 9%wt Cu catalyst loaded by deposition-precipitation (DP) method (CuCZ copre and Cu-MSP CZ, respectively). Both CuCZ copre and Cu-MSP CZ were used in esterification reaction for biodiesel production. Structure and specific surface area of the synthesized supports and catalysts were characterized by XRD and BET tecnhiques. It was found that the specific surface area of CZ copre was less than MSP CZ support. The XRD result of CuCZ copre exhibited the diffraction peak of CuO, indicating the agglomeration of Cu species on support while that of …
Designing Efficient Petroleum Fiscal System For Mozambique, Nelson Victor
Designing Efficient Petroleum Fiscal System For Mozambique, Nelson Victor
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, tax regime is designed to attract investment and provide the contractor with fair return on investment, at the same time, provide the host government with adequate resources for rent, thereby resulting in win-win situation. This study analyses the existing petroleum fiscal regime in the Republic of Mozambique and proposes a more efficient and flexible regime. The analysis shows that the government take currently remains at around 39% while the contactors' net present value (NPV) increases as field sizes and oil prices increase. The current system is considered a regressive system which is inefficient in distributing wealth from oil profit. …
Carbon Nanotube/Polymer Composite Membrane For Co2 Capture, Pacharaporn Yaisanga
Carbon Nanotube/Polymer Composite Membrane For Co2 Capture, Pacharaporn Yaisanga
Chulalongkorn University Theses and Dissertations (Chula ETD)
Membrane gas absorption (MGA) was applied for carbon dioxide capture due to its unique potential, such as independent adjustment of gas and liquid, compact equipment installation, and sizable module. However, a major issue of MGA is membrane wetting, causing lower absorption efficiency and membrane damages. Hydrophobicity is one of the key parameters to improve membrane property for solving such problem. This thesis focused on using carbon nanotubes as the filler to composite with polyacrylonitrile (PAN) or polyvinylidene fluoride (PDVF) via a phase inversion technique to improve membranes hydrophobicity. In case of PAN, the results showed that the addition of CNT …
Novel Shape Memory Polymer From Bio-Based Polybenzoxazine/Bio-Based Epoxy Copolymers, Phakakrong Hombunma
Novel Shape Memory Polymer From Bio-Based Polybenzoxazine/Bio-Based Epoxy Copolymers, Phakakrong Hombunma
Chulalongkorn University Theses and Dissertations (Chula ETD)
Shape memory polymers (SMPs) are known as smart polymer materials which can be deformed and fixed in a temporary shape and can recover to its original shape upon an external stimulus such as temperature which is the main stimulus for general SMPs. In this research, a renewable natural resource based on vanillin-furfurylamine benzoxazine (V-fa) and eugenol-furfurylamine benzoxazine (E-fa) are developed to substitute the use of petroleum based polybenzoxazine. The as-synthesized V-fa and E-fa show the degradation temperature at 5% weight loss to be as high as 343 and 310°C and char content to be 66 and 54%, respectively. Effects of …
Effects Of Fillers On The Properties Of Polypropylene For Fused Deposition Modeling-Based 3d Printing Technique, Chomphoonut Buaprommee
Effects Of Fillers On The Properties Of Polypropylene For Fused Deposition Modeling-Based 3d Printing Technique, Chomphoonut Buaprommee
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of this research was to study the influence of filler contents and filler types on the tensile properties and shrinkage behavior of polypropylene composites to develop the properties of polypropylene (PP) to be a raw material for fused deposition modeling (FDM) technique. PP was compounded with three fillers, i.e., talc and milled glass fiber with aspect ratio 5.4 and 15.4, at various contents of 10, 20 and 30 wt%. The test specimens were fabricated by FDM and injection molding techniques for tensile and shrinkage tests. The findings showed that the increase of filler contents into PP matrix tended …
Microwave Heating With Potassium Hydroxide Activation For Converting Water Hyacinth Into Activated Carbon, Purichaya Kuptajit
Microwave Heating With Potassium Hydroxide Activation For Converting Water Hyacinth Into Activated Carbon, Purichaya Kuptajit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Activated carbon was successfully synthesized form dried water hyacinth via KOH activation with microwave irradiation. Resultant activated carbon with large specific surface area can be produced using microwave irradiation for 1 minute which was consumed less time than conventional heating method that consumed 1 hour. Microwave irradiation can be a strategic way to improve uniform and quick heating to prepare porous carbons by inducing dipole rotation in atomic scale and creating a frictional force between atoms and molecules within heated material so that volumetric heating inside the heated material is realized. The BET analysis shown that the activated carbon, derived …
Mechanism And Performance Of Solid Non-Particulate Soil (Waxy Solid) Removal From Fabrics, Jarussri Chanwattanakit
Mechanism And Performance Of Solid Non-Particulate Soil (Waxy Solid) Removal From Fabrics, Jarussri Chanwattanakit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Methyl palmitate or palmictic acid methyl ester was used as both a model solid fat and an oily soil was removed from cotton and polyester above and below the melting point. Surfactants studied were extended surfactants (C12,13-4PO-SO4Na , C12,14-10PO-2EO-SO4Na and C12,14-16PO-2EO-SO4Na), alcohol ethoxylate (EO9), sodium dodecyl sulfate (SDS), methyl ester sulfonate (MES), methyl ester ethoxylate (MEE), and mixed surfactants between extended surfactant (C12,13-4PO-SO4Na) and sodium mono- and dimethyl naphthalene sulfonate (SMDNS). Above the melting point (~30 ºC) of methyl palmitate, the maximum oily soil removal was found to correlate well with the lowest dynamic interfacial tension (IFT) with increasing washing …
Use Of Anionic Surfactant In Regeneration Of Spent Activated Carbon, Buch Kallapadee
Use Of Anionic Surfactant In Regeneration Of Spent Activated Carbon, Buch Kallapadee
Chulalongkorn University Theses and Dissertations (Chula ETD)
Surfactant-enhanced carbon regeneration (SECR) is a regeneration process that utilizes surfactant solution to dissolve adsorbed organic from spent activated carbon. Sodium dodecyl sulfate (SDS) and methyl ester sulfonate (MES) are anionic surfactants that are used in this investigation. The study is done in 3 steps: sample characterization, regeneration and water flushing step. The proximate analysis of spent activate carbon contains 27.5% moisture, 27.2% volatile matter content, 10% total ash content. The spent activated carbon also contains 18.4% benzene. In regeneration step, the benzene removal by SDS and MES solution were compared. The effect of concentration, solution flow rate and temperature …
Conversion Of Palm Fatty Acid Distillate To Biojet Fuel Over Ni/Hy-Pditioz Core-Shell Catalyst, Chanakran Homla-Or
Conversion Of Palm Fatty Acid Distillate To Biojet Fuel Over Ni/Hy-Pditioz Core-Shell Catalyst, Chanakran Homla-Or
Chulalongkorn University Theses and Dissertations (Chula ETD)
Generally, jet fuel is obtained from the refining of petroleum feedstock in order to powering the aircrafts, hence the world is more confronting a problem with increasing air pollution emission. Therefore, biojet fuel is introduced as an alternative way to solve the problem. Biojet fuel can be derived from bio-based feedstock such as palm fatty acid distillate or PFAD. Which is converted via the deoxygenation reaction in order to remove oxygenated compounds, carboxylic and carbonyl groups in the fatty acid molecules then followed by hydrocracking and hydroisomerization reaction. The heterogeneous catalyst is used to convert PFAD into saturated paraffins in …
Analysis Of Biomarkers In Crude Oils, Processed Oils, And Spilled Oils, Pornpetch Hattakijvilai
Analysis Of Biomarkers In Crude Oils, Processed Oils, And Spilled Oils, Pornpetch Hattakijvilai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Oil spills in marine are commonly come from crude oils, fuel oils and lubricating oils by accidental leakages or purposeful discharges to the surroundings. As crude oil and fuel oil which refined from the heavy fraction of crude oil have similar physical properties especially if they were weathering, it is difficult to differentiate that the spill has the origin from crude oil or fuel oil. In this study, five crude oils, two fuel oils, one fresh and one used lube oil that are typically used in Thailand were investigated. All crude oils, fuel oils, and used lube oil were weathered …
ปฏิกิริยาทรานส์เอสเทอริฟิเคชันของกลีเซอรอลและไดเมทิลคาร์บอเนตโดยใช้ตัวเร่งปฏิกิริยาโซเดียมฟอสเฟต, แพรพรรณ ศรีสอ้าน
ปฏิกิริยาทรานส์เอสเทอริฟิเคชันของกลีเซอรอลและไดเมทิลคาร์บอเนตโดยใช้ตัวเร่งปฏิกิริยาโซเดียมฟอสเฟต, แพรพรรณ ศรีสอ้าน
Chulalongkorn University Theses and Dissertations (Chula ETD)
งานวิจัยนี้เป็นการศึกษาปฏิกิริยาทรานส์เอสเทอริฟิเคชันของกลีเซอรอลและไดเมทิลคาร์บอเนต โดยใช้ตัวเร่งปฏิกิริยาโซเดียมฟอสเฟต โดยทำการทดลองในเครื่องปฏิกรณ์แบบกะ ปริมาณตัวเร่งปฏิกิริยาโซเดียมฟอสเฟตร้อยละ 1 3 และ 5 โดยน้ำหนักของกลีเซอรอล อัตราส่วนโดยโมลระหว่างกลีเซอรอลต่อไดเมทิลคาร์บอเนต 1:1 1:2 1:3 และ 1:4 อุณหภูมิในการทำปฏิกิริยาที่ 60 70 75 และ 80 องศาเซลเซียส ผลการทดลองแสดงให้เห็นว่า ตัวเร่งปฏิกิริยาโซเดียมฟอสเฟตมีความว่องไวในการทำปฏิกิริยาทรานส์เอสเทอริฟิเคชันของกลีเซอรอลและไดเมทิลคาร์บอเนต การเพิ่มปริมาณของตัวเร่งปฏิกิริยาที่ไม่เกินร้อยละ 3 โดยน้ำหนักของกลีเซอรอล ส่งผลให้ค่าร้อยละผลได้ของกลีเซอรอลคาร์บอเนตมีค่าเพิ่มมากขึ้น การลดลงของอัตราส่วนโดยโมลระหว่างกลีเซอรอลต่อไดเมทิลคาร์บอเนต ส่งผลให้ค่าร้อยละการแปลงผันของกลีเซอรอลและค่าร้อยละผลได้ของกลีเซอรอลคาร์บอเนตเพิ่มมากขึ้น นอกจากนี้ยังช่วยลดการเกิดดีคาร์บอกซิเลชันของกลีเซอรอลคาร์บอเนตไปเป็นไกลซิดอลอีกด้วย ในส่วนของการเพิ่มอุณหภูมิในการทำปฏิกิริยาส่งผลให้ค่าร้อยละการแปลงผันของกลีเซอรอล ค่าร้อยละผลได้ของกลีเซอรอลคาร์บอเนตเพิ่มสูงขึ้นและยังช่วยให้ปฏิกิริยาเข้าสู่สมดุลเร็วมากยิ่งขึ้น
Effects Of Ratio Of Oxygen Partial Pressure To Propane Partial Pressure And Temperature On Non-Faradaic Electrochemical Modification Of Catalytic Activity (Nemca) Of Propane Oxidation On Pt-Ysz, Sareerat Thongsrigate
Effects Of Ratio Of Oxygen Partial Pressure To Propane Partial Pressure And Temperature On Non-Faradaic Electrochemical Modification Of Catalytic Activity (Nemca) Of Propane Oxidation On Pt-Ysz, Sareerat Thongsrigate
Chulalongkorn University Theses and Dissertations (Chula ETD)
The effects of electrochemical promotion of catalysis (EPOC) or non-faradaic electrochemical modification of catalytic activity (NEMCA) of sputtered-Pt catalyst on Y2O3-stabilized-ZrO2 (YSZ) disk, an O2- conductor, were studied with the catalytic reaction of propane oxidation, which was chosen to model the combustion of residual hydrocarbons in catalytic converters. In electrochemical promotion, the catalyst was electrochemically promoted by applying electric current or potential between the Pt and Au electrodes of YSZ disk. Catalytic performances were studied under the ratio of oxygen partial pressure to propane partial pressure difference of 1 to 5 and partial pressure of propane was 1 kPa, in …
Time Series Pattern Discovery Techniques For Well-To-Well Log Correlation, Chanchai Apiwatsakulchai
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 …
Coal Combustion Products Utilization For Soil Amendment, Tran Thi Anh Tuyet
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 …
Assisted Methane Hydrate Formation With The Addition Of Promoters, Chutikan Jaikwang
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 …
Microbial Conversion Of Cellulose To Sugars By Bacterial Enzyme, Kessara Seneesrisakul
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 …
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 …
Adsorptive Bubble Separation For Oil Removal, Paweena Kanokkarn
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 …
Investigation Of Asphaltene Aggregation Kinetics In The Presence Of Water-In-Oil Emulsion, Penpitcha Roengsamut
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 …
Study On Energy Storage Ability Of Zno/Tio2 For Photocatalytic Degradation Of Isopropanol, Ratchawan Jarumanee
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 …
Vegetable Oil Based Microemulsion Biofuels, U-Larak Peson
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 …
Improvement Of Life Cycle Assessment Software And Its Applications, Yodsathorn Chavewanmas
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 …
Methane Adsorption By Carbon Molecular Sieve Derived From Polycarbonate And Polyaniline, Jakchai Thawornwatthanasirikul
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 …
Effect Of Oxygen-Containing Functional Groups On Methane Adsorption By Activated Carbon, Kittima Dheerapreampree
Effect Of Oxygen-Containing Functional Groups On Methane Adsorption By Activated Carbon, Kittima Dheerapreampree
Chulalongkorn University Theses and Dissertations (Chula ETD)
Natural gas has been applied as a fuel for vehicle because it is cheaper and cleaner burning than other fuels. In the vehicle, natural gas is ordinarily reserved by compressing and storing under high pressure at room temperature but this method has several limitations (e.g. low energy density, high weight of tank). Therefore, a porous material with high specific surface area (e.g. activated carbon) is suggested to eliminate the limitations of natural gas storage by compression, natural gas is adsorbed at relatively low pressure and room temperature. The adsorption capacity of activated carbons is related with their physical and chemical …
The Incipient Layer Of Wax Deposit, Tunya Ketjuntiwa
The Incipient Layer Of Wax Deposit, Tunya Ketjuntiwa
Chulalongkorn University Theses and Dissertations (Chula ETD)
The formation of the incipient layer of wax deposit when waxy oil is exposed to a cold surface is studied. Using a cold-finger apparatus, the evolution of deposit thickness is monitored with a video camera, allowing one to resolve the deposit layer formation from inception up to long times where deposit thickness no longer times where deposit thickness no longer grows. Characterization of wax deposits show that incipient layer has identical composition to waxy oil, indicating that deposit is not formed by a diffusion process. Modelling shows deposit formation at the investigated conditions cannot be explained by a diffusion process.