Pyrolysis of asphalt in the presence and absence of water |
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| Affiliation: | 1. UMR G2R Géologie et Gestion des Ressources Minérales et Energétiques, BP 239, 54506 Vandoeuvre les Nancy, France;2. ANDRA Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92298 Châtenay Malabry cedex France;1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, PR China;2. State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410014, Hunan, PR China;3. Research Institute of Highway, Ministry of Transportation, Beijing 100088, PR China;4. Key Laboratory of Road Structure & Material of Transport Ministry, Chang’an University, Xi’an 710064, Shaanxi, PR China;1. School of Energy and Power Engineering, Northeast Electric Power University, Jilin City, Jilin, 132012, PR China;2. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum (Beijing), Beijing, 102249, PR China;1. Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, PR China;2. State Key Laboratory of Fine Chemicals, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, PR China;3. Shanxi Coal and Chemical Industry Group Co. Ltd, Block B City Gate Building, 1 Jinye Road, High-Tech Zone, Xi’an City, PR China;1. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China;2. Bureau of Economic Geology, The University of Texas at Austin, TX, United States;3. U.S. Geological Survey, Denver, CO, United States;4. School of Geosciences, Lanzhou University, Lanzhou, Gansu 730000, China;1. Cátedra de Medio Ambiente, Facultad de Ciencias, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain;2. Environment and Bioproducts Group, Facultad de Ciencias, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain;3. Centro de Química Aplicada y Biotecnología, Universidad de Alcalá. 28871 Alcalá de Henares, Madrid, Spain |
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| Abstract: | The bitumen used for the embedding of nuclear wastes has been pyrolysed in confined and hydrous systems, in order to evaluate while an elevation of the temperature in the deep geological repository could induce chemical transformations of the bitumen matrix, which could influence its confining properties. The pyrolysates have been extracted in chloroform and the extract has been separated in aliphatic and aromatic hydrocarbons, resins and asphaltenes. These different fractions have been analyzed by GC-MS and μ-IRTF. Few modifications of the bitumen structure are observed up to 300 °C. Above this temperature, the pyrolysis of the bitumen generates light hydrocarbons and an aromatic and condensed insoluble residue. The use of the time–temperature index allows to estimate the temperatures which have to be reached in the repository in order to observe the first transformations of the bitumen. |
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