Isolating Petroleum Pitch Oligomers via Semi-continuous Supercritical Extraction
| Autor: | Sourabh U. Kulkarni, Mark C. Thies, David F. Esguerra |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Chromatography General Chemical Engineering Supercritical fluid extraction Analytical chemistry Energy Engineering and Power Technology Polycyclic aromatic hydrocarbon Trimer Fractionation Mass spectrometry Toluene chemistry.chemical_compound Fuel Technology Monomer chemistry Desorption |
| Zdroj: | Energy & Fuels. 26:2721-2726 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/ef201456q |
| Popis: | Dense-gas/supercritical extraction (DGE/SCE) was used for the fractionation of a representative petroleum pitch, M-50, into its oligomeric constituents using toluene as the extractive solvent. A small, pilot-scale column was operated in the semi-continuous/semi-batch mode under a linear positive temperature gradient of 380–330 °C from the top to the bottom of the column and over a pressure range of 15–75 bar. This DGE column was used to produce high-purity monomer, dimer, and trimer fractions of M-50 suitable for use as molecular standards for petroleum pitches and for polycyclic aromatic hydrocarbon (PAH) oligomers. During the experimental runs, matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) was used to monitor in real time the progress of the separation (and oligomeric purity) by performing rapid analyses of the molecular-weight distributions (MWDs) of the overhead fractions being collected. These real-time analyses provided us with the ability to fine-tune in situ the operat... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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