Examensarbeten på grundnivå // Basic Level Theses
Länka till denna samling:
Browse
Browsar Examensarbeten på grundnivå // Basic Level Theses efter Titel
Visar 1 - 20 av 153
Sökresultat per sida
Sortera efter
- PostA Desulphurization Study of Sour Gas in Petroleum Refining(2019) Abulkheir, Randa; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical EngineeringIn this work, a detailed comparison of three desulphurization methods (chemical solvents, physical solvents, and solid beds) are evaluated, with focus on proposing a suitable gas sweetening method applicable to the vacuum distillation off-gases in Nynas Gothenburg refinery. To obtain necessary input data for the evaluation, a gas measurement method was developed to extract gases using a modified gas syringe with check valves. The extracted gases were analysed to detect their concentrations using colorimetric gas detection tubes coupled with a tube hand pump. The compounds measured are hydrogen sulphide, mercaptan, ethyl mercaptan, carbon disulphide, carbonyl sulphide, sulphur dioxide, water vapor, and oxygen. The experiments were carried out on two separate dates while the refinery was on two different drift modes, mode 200 and mode 412. The measured concentrations showed that with drift mode 200, hydrogen sulphide is 45 ppm, and mercaptans >24000 ppm (>2.4 w/w%). For drift mode 412, the concentration for both hydrogen sulphide and mercaptan were above detection limit (>1000ppm). However, with the use of a triazine physical solvent Prosweet, the concentration of hydrogen sulphide was measured to be 3 ppm, and mercaptans 50 ppm, with 85w/w% of the mercaptans being ethyl mercaptan. Based on this data, the most effective desulphurization method according to literature is solid beds, specifically molecular sieves. However, this method needs to be verified by desulphurization experiment for the specific case before an engineering study of its feasibility can be performed. Based on the data available in this evaluation, the proposed method for Nynas Gothenburg is therefore a physical solvent, specifically triazine, although this method also requires further testing, in particular with the new feed stock “Europa”, to verify the effectiveness of the method, before applying it in the refinery.
- PostA review of pyrolysis of bark towards bio-oil(2015) Lövhall, Fredrik; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostA study of alternative polyurethane films with hemicellulose(2017) Magnusson, Maria; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAgglomeration of granulated copper smelter slag in oxygen carrier aided combustion(2023) Thorpe, Ati; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering; Leion, Henrik; Eliasson Störner, FeliciaOxygen carrier aided combustion (OCAC) is a concept used in fluidized bed boilers. The oxygen carrier used in OCAC functions as an oxygen buffer, which allows for better oxygen distribution which in turn decreases incomplete combustion and the excess air flow need. A promising potential oxygen carrier is granulated copper smelter slag, commonly known as iron sand. However, in unpublished research it’s been observed that granulated copper smelter slag has agglomerated (lumped together) when rapidly heated from its fresh state to around 800 °C during OCAC. As agglomeration could cause the fluidized bed boiler to stop fluidizing (defluidization), investigation seemed prudent. The project aimed to investigate the cause of the agglomeration, and potential solutions. A laboratory scale fluidized bed was used in conjunction with a sweep electron microscope to try to find the cause of agglomeration. The study found that defluidization of granulated copper smelter slag occurred both in the presence and absence of air, at around 650 ºC. In other words, oxidation is unlikely to be the primary cause for defluidization and in turn agglomeration. Additionally, it was found that oxidation of copper smelter slag affected defluidization and higher oxidation levels hindered defluidization. As the oxidation affected defluidization it could be possible to avoid defluidization by slowly heating copper smelter slag. In conclusion additional research on the oxygen free defluidization would be required to understand the underlying cause for the agglomeration of granulated copper smelter slag in OCAC.
- PostAlternative Anti-Skinning Agents -For Solvent-Borne Woodcare Coatings(2013) Komi, Louise; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostAn analysis of films based on different cellulose derivatives(2013) Ambrus, Erik; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostAnalys av kvicksilver i urin med flam-lös atomfluorescensspektrometri(2019) Kölbel, Sebastian; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostAnalysis of acrylic acid, phosphoric acid and 2-ethylhexylamine in surfactant with capillary electrophoresis(2012) Larsson, Napaporn; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostAskinteraktioner med syrebärare i en CLC-process - enskilda och sammansatta askor(2013) Eresund, Lisa; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostÅtervinning av bildäck: Möjliga separationsprocesser mellan kimrök-metall och strukturanalyser av kimrök(2014) Gunnarsson, Emmelie; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostAttrition analysis of oxygen carriers in combustion appliances(2023) Sandell, Erik; Hertzberg, Mattias; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering; Leion, Henrik; Purnomo, VictorCarbon capture and storage (CCS) is a technology which can help reduce emissions of CO2 into the atmosphere and thereby reduce environmental impacts. Ideally, this is implemented by storing pure CO2 gas in stable geological structures. However, this can be challenging to achieve due to emissions often being a mixture of CO2, nitrogen and other byproducts. Chemical looping technology (CLT) can simplify this process by implementing an oxygen-carrying material instead of air to supply oxygen for the reaction. This removes nitrogen from the combustion process and resulting exhausts which consists of CO2 and water. The oxygen-carrying material used in CLT is often metal oxide particles circulated between two fluidized bed reactors. The harsh conditions in the systems lead to attrition of the particles and future implementation of this technology requires a material that is inexpensive, well suited for the reactions, and with a long lifespan in the process. Therefore, this study aims to analyze the attrition rate of different oxygen carrier materials, namely, ilmenite, iron sand, mill scale, LD slag, and synthetic ilmenite. Each material was also examined at different reduction degrees. The most attrition-resistant materials were ilmenite and iron sand and the least resistant were LD-slag and synthetic ilmenite. Most materials were not considerably affected by reduction. Mill scale showed increased attrition in partially oxidised and highly reduced states with cracks forming in the particles visible in SEM imagery.
- PostAvvattning av biologiskt slam(2011) Nes, Ganic; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostBy-Product Hydrogen to Fuel Cell Vehicles(2016) Braxenholm, Daniel; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCarbohydrate Synthesis: A synthesis of functionalized glucoronic acids as potential model substrates(2015) Svantesson, Mona; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCarbohydrate synthesis: Study on the synthesis of methyl 2,3,6-tri-O-benzyl-alfa-D-Glucopyranoside(2016) Axelsson, Nicolas; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCellulose reinforced composites(2018) Torén, Krister; Gidlund, Love; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostCharacterisation of chemical decomposition of biodiesel with a focus on B10, B30 and B100 blends.(2012) Wäring, Jens; Svanberg, Krister; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostCharacterization of Acetylcholine esterase - gold nanoparticle conjugates(2012) Åkesson, Sebastian; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostCharacterization of Pharmaceutical Aerosols(2019) Alhede, Jakob; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostChemical Modification of Microcrystalline Cellulose for use in Biocomposites with Polylactic acid(2015) Jerre, Lea; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering