Hydrothermal Oxidation of Hydrogen Sulfide
Author
Gerganov, Alexandr
Term
4. term
Education
Publication year
2025
Abstract
I olie- og gasindustrien skaber hydrogensulfid (H2S) betydelige sikkerheds-, korrosions- og miljøproblemer, særligt offshore hvor plads og drift er begrænset. I dag anvendes oftest kemiske scavengers, som efter reaktion med H2S udledes til havet, hvilket giver miljømæssige bekymringer. Dette speciale undersøger hydrotermisk (våd) oxidation som et alternativ, hvor H2S først opfanges i et basisk opløsningsmiddel og derefter oxideres, så uønskede kemikalier ikke når havmiljøet. De centrale forskningsspørgsmål er: hvilke driftsbetingelser (fx temperatur og opholdstid) muliggør effektiv oxidation af opløst sulfid, hvilke oxidationsprodukter dannes, og hvordan ændrer svovlspecieringen sig under processen. Arbejdet omfatter en problem- og litteraturanalyse af H2S-dannelse og -fjernelse, gennemgang af hydrotermisk/våd oxidation og reaktionsveje, samt laboratorieforsøg i en højtemperaturreaktor med trinvise og temperaturafhængige serier. Svovl i forskellige former karakteriseres med Raman-spektroskopi, ionkromatografi, et analysekit for sulfitter og ICP-OES til total svovl, efterfulgt af dataanalyse og reaktionsmodellering. De konkrete forsøgsresultater og konklusioner (herunder temperaturens indflydelse og modeltilpasninger) er ikke beskrevet i dette uddrag og præsenteres i specialets senere kapitler.
In the oil and gas industry, hydrogen sulfide (H2S) poses major safety, corrosion, and environmental challenges, especially offshore where space and operations are constrained. The prevailing practice is to use chemical scavengers that react with H2S and are then discharged to the sea, raising environmental concerns. This thesis investigates hydrothermal (wet air) oxidation as an alternative, in which H2S is first captured in a basic solvent and then oxidized to prevent harmful chemicals from reaching the marine environment. The core research questions are: which operating conditions (e.g., temperature and residence time) enable efficient oxidation of dissolved sulfide, which oxidation products form, and how sulfur speciation evolves during treatment. The work comprises a problem and literature review on H2S formation and removal, an overview of hydrothermal/wet oxidation and reaction pathways, and laboratory experiments in a high‑temperature reactor conducted in stages with temperature comparisons. Sulfur in different forms is characterized using Raman spectroscopy, ion chromatography, a colorimetric kit for sulfite, and ICP‑OES for total sulfur, followed by data analysis and reaction modeling. Specific experimental outcomes and conclusions (including temperature effects and model fits) are not included in this excerpt and are presented in later chapters of the thesis.
[This summary has been generated with the help of AI directly from the project (PDF)]
Documents