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Waste plastic for increasing softening point of pitch and specific surface area of activated carbon based on the petroleum residue

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Abstract

Pyrolysis fuel oil (PFO) is used for the manufacturing of high-purity pitch for carbon precursor due to its high carbon content, high aromaticity, and low heterogeneous element and impurity content. Pitch is commonly classified with its softening point, which is most considerable physical property affecting to various characteristics of the carbon materials based on pitch, such as electrical and thermal conductivity, mechanical strength, and pore property. Hence, the softening point should be controlled to apply pitch to produce various carbon materials for different applications. Previous studies introduce reforming process under high pressure and two step heat treatment for the synthesis of pitch with high softening point from PFO. These methods lead to a high process cost; therefore, it is necessary to develop a process to synthesize the pitch with high softening point by using energy effective process at a low temperature. In this study, waste polyethylene terephthalate (PET) was added to control the softening point of PFO-based pitch. The pitch synthesized by the heat treatment with the addition of PET showed the softening point higher than that of the pitch synthesized with only PFO. The softening point of PFO-based pitch synthesized at 420 °C was 138.3 °C, while that of the pitch synthesized by adding PET under the same process conditions was 342.8 °C. It is proposed that the effect of the PET addition on the increase in the softening point was due to the radicals generated from thermal degradation of PET. The radicals from PET react with the PFO molecules to promote the polymerization and finally increase the molecular weight and softening point of the pitch. In addition, activated carbon was prepared by using the pitch synthesized by adding PET, and the results showed that the specific surface area of the activated carbon increased by the addition of PET. It is expected that the pitch synthesis method with PET addition significantly contributes to the manufacture of pitch and activated carbon.

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Acknowledgements

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) and the Ministry of Trade, Industry and Energy(MOTIE) of the Republic of Korea (No. 20181110200070).

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Authors and Affiliations

  1. C1 Gas and Carbon Convergent Research, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea

    Cheol Hwan Kwak, Sang Wan Seo, Min Il Kim & Ji Sun Im

  2. Department of Biological Engineering, Inha University, Incheon, 22212, Republic of Korea

    Cheol Hwan Kwak & Yun Suk Huh

  3. Department of Applied Chemical Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea

    Sang Wan Seo

  4. Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea

    Ji Sun Im

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  1. Cheol Hwan Kwak
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Correspondence to Ji Sun Im.

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Kwak, C.H., Seo, S.W., Kim, M.I. et al. Waste plastic for increasing softening point of pitch and specific surface area of activated carbon based on the petroleum residue. Carbon Lett. 31, 991–1000 (2021). https://doi.org/10.1007/s42823-020-00211-4

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  • DOI: https://doi.org/10.1007/s42823-020-00211-4

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