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• W2949677225 abstract "Abstract Mesophase pitch, as an important chemical intermediate, belongs to highly structured pitch materials that has good property for conducting heat or electricity. Pitch can be naturally derived from petroleum or coal tar. Prior to producing the mesophase pitch materials, the removal of complex low molecular weight polycyclic aromatic hydrocarbons (PAHs) from the original petroleum pitch is essential. In the study, we have developed a two-step process using high pressure CO2 for separating the useful part with desired properties from the raw petroleum pitch sample. Firstly, a stepwise supercritical CO2 (scCO2) extraction process was employed for removing the lightest molecular weight fractions. The residual and CO2-insoluble fractions were further separated by a subcritical anti-solvent (SAS) process using CO2 at 25 °C and three high pressure conditions. A modified SAS apparatus was utilized in this study. The gel-permeation chromatography (GPC) analysis system with standard calibrations was used to determine the molecular weight of various pitch samples. The GPC system was equipped with dual Ultraviolet (UV) and Refractive Index (RI) detectors. The polydispersity index (PDI) value of the raw petroleum pitch 6 (PP6) sample was 6.9, and it was reduced to 3.8 after the scCO2 extraction and under the appropriate SAS processing pressure. The corresponding weight average molecular weight (Mw) was increased from 987 to 1493 g/mol. This study provides an effective separation and product identification method that only employs commonly used GPC analyses with dual UV and RI detectors. A useful screening method has been developed for selecting the most appropriate separation parameters." @default.
• W2949677225 created "2019-06-27" @default.
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• W2949677225 date "2019-12-01" @default.
• W2949677225 modified "2023-10-17" @default.
• W2949677225 title "Development of an effective method for the separation of petroleum pitch using high pressure CO2" @default.
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• W2949677225 doi "https://doi.org/10.1016/j.jcou.2019.04.009" @default.
• W2949677225 hasPublicationYear "2019" @default.
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