Aquathermolysis of humic and fulvic acids: Simulation of organic matter maturation in hot thermal waters |
| |
| Institution: | 1. Institute for Geochemical Research, Hungarian Academy of Sciences, H-1112 Budapest, Budaörsi út 45, Hungary;2. EKOL, Joint Research and Training Laboratory on Separation Techniques, Eötvös Loránd University, Budapest, Hungary;3. Department of Colloid Chemistry, University of Szeged, Hungary;1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China;2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China;3. GuanZhuang Campus, University of Science and Technology Beijing, Beijing, 100083, China;4. School of Chemical Engineering, The University of Queensland, Queensland, 4072, Australia;5. China Steel Development Research Institute, Beijing, 100010, China;6. Swerim AB, SE-971 25, Luleå, Sweden;1. Royal Institute of Technology, School of Industrial Engineering and Management, Department of Materials Science and Engineering, Group of Energy and Furnace Technology, Brinellvägen 23, SE-100 44 Stockholm, Sweden;2. RISE – Research Institutes of Sweden, Box 5604, SE-114 86 Stockholm, Sweden;1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. College of Environment, Hohai University, Nanjing, Jiangsu 210024, China;3. Nanjing Environment Group Co. LTD, Nanjing, Jiangsu 210026, China;1. College of Environment, Hohai University, Nanjing 210098, PR China;2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China;3. Environmental Policy and Standard Research Department, Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou, Zhejiang 310007, PR China |
| |
| Abstract: | Dissolved aromatic compounds in Hungarian thermal waters were first reported more than 10 years ago. Among the identified compounds were alkylbenzene, polyaromatic hydrocarbon and heteroaromatic homologue series. The appearance of dissolved organic compounds has been bound to a threshold temperature of ～80 °C, and their distribution is controlled by the water temperature. Relative demethylation and aromatisation were observed with increasing temperature. The origin of these compounds is not proved. Among precursor candidates are humic substances.Simulation experiments were carried out on humic and fulvic acid and on their mixture to gain information on aromatic compounds formed. The samples were heated and products were measured with GC-MS.In the presence of oxygen, increasing concentration of benzene can be observed as a function of temperature. Toluene and thiophene can be identified, other alkylbenzenes are missing. Under reductive conditions the concentration of benzene, toluene and the ratio of short to long chained aromatics generally increases in every sample as a function of temperature. Main compounds are toluene and benzene. The amount of heteroaromatic compounds increases with temperature, but their relative concentration compared to aromatic hydrocarbons decreases. At higher temperatures the proportion of pyrroles drops and S and O containing ones become dominant.The different processes (formation, aromatisation, polycondensation, relative demethylation, decomposition) occur in parallel but their relative intensities vary as a function of temperature. The effects of duration and increasing temperature are similar but not equal: both demethylation and aromatisation can be observed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
