EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS
Asphaltenes fractions were extracted and purified from three heavy Brazilian oils. Their mass compositions of C, H, N, Ni and V were obtained from elemental analysis and S and O atomic percentages from EDS. The H/C ratios showed high degree of unsaturation, while the O atomic percentages indicated m...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2021-06-01
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| Series: | Química Nova |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422021000400391&tlng=en |
| _version_ | 1818732033292107776 |
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| author | Hemmely Guilhermond de Souza Severino Christiane Béatrice Duyck Pinto André Luiz Durante Spigolon Carlos Siqueira Bandeira de Mello Tais Freitas da Silva Kátia Zaccur Leal |
| author_facet | Hemmely Guilhermond de Souza Severino Christiane Béatrice Duyck Pinto André Luiz Durante Spigolon Carlos Siqueira Bandeira de Mello Tais Freitas da Silva Kátia Zaccur Leal |
| author_sort | Hemmely Guilhermond de Souza Severino |
| collection | DOAJ |
| description | Asphaltenes fractions were extracted and purified from three heavy Brazilian oils. Their mass compositions of C, H, N, Ni and V were obtained from elemental analysis and S and O atomic percentages from EDS. The H/C ratios showed high degree of unsaturation, while the O atomic percentages indicated more pronounced biodegradation effects on two samples. Quantitative data on N, Ni, and V and semi-quantitative data on S were related to oils origins. The structural data of asphaltenes were explored by combining Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR). The oil with the lower degree of biodegradation contained asphaltenes with a lower level of condensed aromatic rings and longer aliphatic chain substituents. The asphaltenes obtained from the two most biodegraded oils showed similarities of polar groups and the presence of carboxylic functions, as well as lower contents of aliphatic substituents. The quality and quantity of occluded hydrocarbons were assessed after the mild oxidation of the separated asphaltenes fractions. It was suggested that the severe biodegradation which altered these structures may also be responsible to affect their occluded hydrocarbons. |
| first_indexed | 2024-12-17T23:27:08Z |
| format | Article |
| id | doaj.art-21bf365ff8d442d6a93023873c046fec |
| institution | Directory Open Access Journal |
| issn | 1678-7064 |
| language | English |
| last_indexed | 2024-12-17T23:27:08Z |
| publishDate | 2021-06-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-21bf365ff8d442d6a93023873c046fec2022-12-21T21:28:44ZengSociedade Brasileira de QuímicaQuímica Nova1678-70642021-06-0144439140110.21577/0100-4042.20170697EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILSHemmely Guilhermond de Souza Severinohttps://orcid.org/0000-0003-0375-6092Christiane Béatrice Duyck PintoAndré Luiz Durante SpigolonCarlos Siqueira Bandeira de MelloTais Freitas da SilvaKátia Zaccur LealAsphaltenes fractions were extracted and purified from three heavy Brazilian oils. Their mass compositions of C, H, N, Ni and V were obtained from elemental analysis and S and O atomic percentages from EDS. The H/C ratios showed high degree of unsaturation, while the O atomic percentages indicated more pronounced biodegradation effects on two samples. Quantitative data on N, Ni, and V and semi-quantitative data on S were related to oils origins. The structural data of asphaltenes were explored by combining Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR). The oil with the lower degree of biodegradation contained asphaltenes with a lower level of condensed aromatic rings and longer aliphatic chain substituents. The asphaltenes obtained from the two most biodegraded oils showed similarities of polar groups and the presence of carboxylic functions, as well as lower contents of aliphatic substituents. The quality and quantity of occluded hydrocarbons were assessed after the mild oxidation of the separated asphaltenes fractions. It was suggested that the severe biodegradation which altered these structures may also be responsible to affect their occluded hydrocarbons.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422021000400391&tlng=enasphalteneheavy oilbiodegradationoccluded hydrocarbon |
| spellingShingle | Hemmely Guilhermond de Souza Severino Christiane Béatrice Duyck Pinto André Luiz Durante Spigolon Carlos Siqueira Bandeira de Mello Tais Freitas da Silva Kátia Zaccur Leal EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS Química Nova asphaltene heavy oil biodegradation occluded hydrocarbon |
| title | EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS |
| title_full | EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS |
| title_fullStr | EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS |
| title_full_unstemmed | EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS |
| title_short | EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS |
| title_sort | evaluation of the chemical composition and structure of asphaltenes from three offshore brazilian biodegraded heavy oils |
| topic | asphaltene heavy oil biodegradation occluded hydrocarbon |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422021000400391&tlng=en |
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