Transformation of petroleum asphaltenes in supercritical alcohols—A tool to change H/C ratio and remove S and N atoms from refined products
| Autor: | Andrey M. Chibiryaev, Oleg N. Martyanov, Ivan V. Kozhevnikov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_element
Fraction (chemistry) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur Catalysis Supercritical fluid 0104 chemical sciences chemistry.chemical_compound chemistry Yield (chemistry) Methanol 0210 nano-technology Chemical composition Asphaltene Nuclear chemistry |
| Zdroj: | Catalysis Today. 329:177-186 |
| ISSN: | 0920-5861 |
| Popis: | The aliphatic alcohols (methanol, ethanol, 1- and 2-propanol) were used for the upgrading of petroleum asphaltenes. The process was performed under supercritical (sc) conditions at 350 °C. CHNSO analysis and GC methods were used to characterize the elemental and chemical composition of the products preliminarily divided into three fractions: hexane-soluble (HSF), benzene-soluble (BSF), and insoluble residue (IR). It was shown that the sc alcohols leads to the decrease of total content of sulfur and nitrogen in the products (HSF + BSF + IR) by 18–23 and 31–33 wt%, correspondingly, as compared with the initial asphaltenes (IA). The highest yield of the soluble fractions (HSF and BSF) was observed for 1-propanol and ethanol. It appeared that the alcohols used as a reaction media are partially consumed by incorporating in the product molecules as alkoxy substituents. The H and O content of HSF and BSF for all alcohols was significantly higher than that for IA. The composition of hexane-soluble fraction obtained after sc upgrading is quite similar to chemical composition of the diesel fraction, specifically to straight-run gas oil. The efficiency of each supercritical alcohol used for the upgrading of asphaltenes is analyzed and discussed. |
| Databáze: | OpenAIRE |
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