Compositional characterization of pyrolysis fuel oil from Naphtha and vacuum gas oil
| Autor: | Nenad Ristic, Guy B. Marin, Christian V. Stevens, Kevin Van Geem, Elisabeth Delbeke, Arturo González Quiroga, Marko Djokic |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Technology and Engineering
Vacuum distillation Chemistry General Chemical Engineering Analytical chemistry Energy Engineering and Power Technology 02 engineering and technology Fractionation Fuel oil 021001 nanoscience & nanotechnology 7. Clean energy law.invention Fuel Technology 020401 chemical engineering 13. Climate action law Flame ionization detector Gas chromatography 0204 chemical engineering 0210 nano-technology Naphtha Pyrolysis Asphaltene |
| Zdroj: | ENERGY & FUELS Energy & Fuels |
| ISSN: | 0887-0624 1520-5029 |
| Popis: | Steam cracking of crude oil fractions gives rise to substantial amounts of a heavy liquid product referred to as pyrolysis fuel oil (PFO). To evaluate the potential use of PFO for production of value-added chemicals, a better understanding of the composition is needed. Therefore, two PFO’s derived from naphtha (N-PFO) and vacuum gas oil (V-PFO) were characterized using elemental analysis, SARA fractionation, nuclear magnetic resonance (NMR) spectroscopy, and comprehensive two-dimensional gas chromatography (GC × GC) coupled to a flame ionization detector (FID) and time-offlight mass spectrometer (TOF-MS). Both samples are highly aromatic, with molar hydrogen-to-carbon (H/C) ratios lower than 1 and with significant content of compounds with solubility characteristics typical for asphaltenes and coke (i.e. n-hexane insolubles). The molar H/C ratio of V-PFO is lower than the one measured for N-PFO, as expected from the lower molar H/C ratio of the VGO. On the other hand, the content of n-hexane insolubles is lower in V-PFO compared to the one in N-PFO (i.e., 10.3 ± 0.2 wt % and 19.5 ± 0.5 wt %, respectively). This difference is attributed to the higher reaction temperature applied during naphtha steam cracking, which promotes the formation of poly aromatic cores and at the same time scission of aliphatic chains. The higher concentrations of purely aromatic molecules present in N-PFO is confirmed via NMR and GC × GC−FID/ TOF-MS. The dominant chemical family in both samples are diaromatics, with a concentration of 28.6 ± 0.1 wt % and 27.8 ± 0.1 wt % for N-PFO and V-PFO, respectively. Therefore, extraction of valuable chemical industry precursors such as diaromatics and specifically naphthalene is considered as a potential valorization route. On the other hand, hydro-conversion is required to improve the quality of the PFO’s before exploiting them as a commercial fuel. |
| Databáze: | OpenAIRE |
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