Pyrolysis of asphalt in the presence and absence of water

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 prope...

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Bibliographic Details
Published in:Fuel processing technology 2001-12, Vol.74 (2), p.107-123
Main Authors: Schlepp, Laurence, Elie, Marcel, Landais, Patrick, Romero, M.A
Format: Article
Language:English
Subjects:
Applied sciences
Bitumen
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Hydrocarbons
Pollution
Pollution, environment geology
Pyrobitumen
Pyrolysis
Radioactive wastes
Time–temperature index
Wastes
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Summary: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.
ISSN:0378-3820
1873-7188
DOI:10.1016/S0378-3820(01)00207-7