| Autor: |
Pinto JSS; University of Sao Paulo, Luiz de Queiroz College of Agriculture, Piracicaba, SP, Brazil., Assis LM; Federal University of Technology - Paraná, Curitiba, PR, Brazil., Andrade MA; University of Sao Paulo, Institute of Chemistry of São Carlos, São Carlos, SP, Brazil., Lanças FM; University of Sao Paulo, Institute of Chemistry of São Carlos, São Carlos, SP, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of chromatographic science [J Chromatogr Sci] 2018 Sep 01; Vol. 56 (8), pp. 761-769. |
| DOI: |
10.1093/chromsci/bmy051 |
| Abstrakt: |
This work reports a study on the use of Pressurized Liquid Extraction (PLE) for the selective extraction of organic compounds (aliphatic hydrocarbons - AHs, polycyclic aromatic hydrocarbons - PAHs and polycyclic aromatic compounds - PACs) from high-ash Brazilian coal. A homemade PLE system was built and solvents of different polarities (hexane, toluene and ethanol) were employed to extract the organic compounds from coal samples at a pressure of 10 MPa, under temperatures of 80°C and 200°C and extraction times up to 120 min. The selectivity of the extraction process was evaluated by a well-established methodology employed for the characterization of coal extracts (Preparative Liquid Chromatography - PLC 8). The fractions obtained in the PLC-8 method were dried and, after, quantified by gravimetry. Results showed that the proposed method of extraction was selective for the extraction of AHs using hexane at the temperature of 80°C and for the extraction of PAHs at 200°C. Additionally, the method showed to be selective for the extraction of PACs using ethanol at both studied temperatures. The AHs and PAHs fractions were also analyzed by GC-MS, showing that the first was composed mainly by low molecular weight compounds (<31 carbons) while the second by pyrenes, fluoranthenes, crysenes, benzopyrenes, perylenes and benzofluoranthenes. The present method showed to be a powerful tool for selective extraction of organic compounds from coal samples with simplicity, low quantity of solvent and filling other the requirements to be considered a greener method of extraction. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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