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- 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
- 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
- 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
- PostChemical Resistance of the clear coating of a car - An exploratory journey using micro-vickers hardness test with an emphasis on washer fluid(2013) Rolka, Lucas; Chalmers tekniska högskola / Institutionen för kemi- och bioteknik; Chalmers University of Technology / Department of Chemical and Biological Engineering
- PostEarly Hydration of Alite with and without Polycarboxylate Ether Based Superplasticizer(2015) Guang, Yun Gao; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostEvaluation and Characterization of Polyurethane Foam from Naturally and Artificially Aged District Heating Pipes(2019) Byäng, Cornelia; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostHexansyra som alternativ diluent i en GANEX process(2017) Elfverson, Hanna; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostHydrometallurgical Treatment of Spent Lithium-Ion Batteries: A study of optimal conditions for the leaching(2018) Wendy, Zhou; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical EngineeringThe interest of recycling lithium-ion batteries to recover valuable metals has traditionally been focused on economic benefit. Nowadays, the interest has shifted towards a more global perspective on waste disposal because of issues from both environmental impacts and resource supply. The current recycling processes are designed to operate with small lithium-ion batteries from portable electronic devices [1], and do not satisfy the new requirement in environment and recycling efficiency for larger, more advanced lithium-ion batteries from electric vehicles and plug-in hybrid electric vehicles. Therefore, recycling processes must be developed to accommodate an increasing amount of vehicle lithium-ion batteries, that are expected to enter the waste stream in the near future. Leaching is an essential step for effective recovery of metals from spent lithium-ion batteries during hydrometallurgical treatment. The objective of the present work was to determine the optimal leaching conditions for recovery of metals from spent lithium-ion batteries. The leaching was carried out by using hydrochloric acid. Effects of different concentrations, temperatures, reaction times and solid-to-liquid ratios were examined. With optimal leaching conditions found to be 1 M hydrochloric acid, 60 min leaching time, at 40oC with solid to liquid ratio of 1/20 g/ml.
- PostInfluence of process parameters of xanthan gum(2015) Kerttu, Malin; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostKartläggning av ång- och kondensatsystem på Borealis Polyeten(2016) Hillberg, Malin; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostKlassificering av silicapartiklar i mikrostorlek med våtsiktningsteknologi(2019) Ekebom, Filip; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostKlassificering av silicapartiklar i mikrostorlek med våtsiktningsteknologi(2019) Karlsson, Emil; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostKorrosionsstudie av bipolära plattor i HT-PEM bränsleceller(2015) Ärleborg, Sandra; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostLeaching and recovery of metals from municipal soild waste incineration ashes(2015) Khan, Taha; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostMicrokinetic Modeling of Promotional Effects of H2 for Diesel Oxidation Catalyst(2015) Pissot, Sebastien; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostMixing cement with carbon dioxide – effect on early hydration(2017) André, Joel; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostModeling of the Cement System and Clinker Phases using MOPAC and NWChem(2015) Tollesson, Joakim; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering
- PostModellering av ekotoxisk påverkan för bekämpningsmedel(2015) Lindgren, Jorun; Chalmers tekniska högskola / Institutionen för kemi och kemiteknik; Chalmers University of Technology / Department of Chemistry and Chemical Engineering