Determinação do calor especifico do xisto da Formação Irati e do xisto de New Brunswick, usando o calorimetro de varredura diferencial DSC-50

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Oil shale is a compact rock of sedimentary origin, made up of complex organic components distributed in a mineral matTÍx. The organic matter, called kerogen is liberated upon heating at temperatures above 3500 C. A large part ofthe organic carbon in the world is present in the form of combustible fossil fuels and most of these are found in oil shale. It is important to know the thermal properties of shale, such as specific heat. fu order to determine the specific heat of oil shales from the Irati Formation (Brazil) and from New Brunswick (Canada), a differencial scanning calorimetry DSC-50 from the Shimadzu Corporation was used. The analyses were performed on samples of raw , retorted and burned shale. This investigation has as the main objetive the obtaining of the optimal conditions for the analysis in order to minirnize errors. The experimental data were analyzed by the amplitude method (method 1) and by using T A-50WS software by Shimadzu (method 2). The results were analyzed using the Origin version 6.0 statistical software. The obtained equations describe the effect of specific heat on temperature. The results show that the values of specific heat obtained for these shales increase with temperature. The values of specific heat ofthe New Brunswick shale were greater than that ofthe Irati Formation shale. The cp values are in the range 1,33 - 1,37 J/g °c and 1,30 - 1,37 J/g °c for temperatures ranging from 100 to 300°C, respectively. Good repeatability of the results was obtained in optimal operating conditions

ASSUNTO(S)

calorimetria calor especifico xisto

ACESSO AO ARTIGO

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