Effects of pressurized PFO-based pitch coking conditions on coke yield and graphite conductivity
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Carbon Letters https://doi.org/10.1007/s42823-020-00197-z
ORIGINAL ARTICLE
Effects of pressurized PFO‑based pitch coking conditions on coke yield and graphite conductivity Jong Hoon Cho1,2 · Byong Chol Bai3 Received: 13 August 2020 / Revised: 14 October 2020 / Accepted: 15 October 2020 © Korean Carbon Society 2020
Abstract In the present study, pyrolyzed fuel oil (PFO)-based pitch without impurities was used to prepare coke under pressure, and the preparation yield and the powder resistance depending on the graphitization were investigated. The preparation yield of green coke by pressurized coking at 500 °C was about 26–27% higher than that at normal pressure. However, the coke yield after the thermal treatment of green coke at 900 °C was lower by 10.6–14.8% at the pressurization conditions than under normal pressure. This may be because the substances that are not vaporized under the pressurized conditions remain in the reactants and then are discharged later. The coke yield after the thermal treatment at 900 °C was higher by 14.9–28.3% under the pressurized conditions than under the normal pressure, indicating that the low-boiling point materials of the pitch participated more in coke polymerization under the pressurized conditions. The density of the coke prepared under the pressurized conditions was lower than that of the coke prepared under normal pressure, because the low-boiling point materials of the pitch participated in the reaction. However, after graphitization, the density values became similar (2.27–2.26 g/cm3). The volume resistivity of the graphitized samples was in a range of 0.499 × 10–2–0.384 × 10–2 Ω cm, indicating that the coke samples have similar electrical properties. The results of the present study show that, in comparison with the conventional normal-pressure process, the pressurized coking process can improve the yield through the participation of low-boiling point materials in the polymerization reaction, while maintaining the properties of the prepared coke and graphite, such as the conductivity and density. Keywords Coke · PFO-based pitch · Yield · Conductivity
1 Introduction Various petrochemical products are produced by oil refineries, where many petroleum-based byproducts are generated. Recently, many studies have been conducted to produce high value-added products by effectively utilizing petroleum-based byproducts [1, 2]. These byproducts are named differently depending on the process from which they * Byong Chol Bai [email protected] 1
Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
2
Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
3
Korea Institute of Convergence Textile, Iksan‑si, Jeollabuk‑do 54588, Republic of Korea
are generated [for example, fluid catalytic cracking decant oil (FCC-DO), pyrolyzed fuel oil (PFO), and vacuum residue (VR)]. These materials can be used as precursors of carbon materi
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