Investigation into role of CO₂ in two-stage pyrolysis of spent coffee grounds

Youkwan KIM, Jechan LEE, Haakrho YI, Yiu Fai TSANG, Eilhann E. KWON

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9 Citations (Scopus)

Abstract

As a way of improving process efficiency of pyrolysis of waste biomass, the effect of carbon dioxide (CO₂) on pyrolysis of spent coffee grounds (SCGs) was examined using a two-stage pyrolysis reactor consisting of a region with increasing temperature and an isothermal region. It was experimentally validated that CO₂ accelerates thermal cracking of organic compounds formed during the pyrolysis of SCGs. The expedited thermal cracking attributed to employing CO₂ in pyrolysis of SCGs led to changing pyrolytic products in gas, liquid, and solid phases. The production of gaseous carbon monoxide was increased when using CO₂ as the pyrolysis medium. In liquid pyrolytic products, the formation of phenolic compounds was hindered in the CO₂-assited pyrolysis. Biochar morphology (solid pyrolytic product) was also changed with different pyrolysis environments. This study shows that CO₂ can help improve applicability of pyrolysis of waste biomass by modifying three phase pyrolytic products in a two-stage pyrolyzer. Copyright © 2018 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)48-53
JournalBioresource Technology
Volume272
Early online dateOct 2018
DOIs
Publication statusPublished - Jan 2019

Citation

Kim, Y., Lee, J., Yi, H., Tsang, Y. F., & Kwon, E. E. (2019). Investigation into role of CO₂ in two-stage pyrolysis of spent coffee grounds. Bioresource Technology, 272, 48-53. doi: 10.1016/j.biortech.2018.10.009

Keywords

  • Waste-to-energy
  • Biomass valorization
  • Thermo-chemical process
  • Carbon dioxide

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