Production of Hydrochars from Lignocellulosic Biomass with and without Boric Acid

Ercan B., Ajagbe Y. O., Uçar S., Tekin K., Karagoz S.

CHEMICAL ENGINEERING & TECHNOLOGY, vol.45, no.11, pp.2112-2122, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 11
  • Publication Date: 2022
  • Doi Number: 10.1002/ceat.202200117
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.2112-2122
  • Keywords: Biorefining, Boric acid, Hydrochars, Hydrothermal carbonization, Lignocellulosic biomass, HYDROTHERMAL CARBONIZATION, GREEN CHEMISTRY, WOOD CHIPS, CELLULOSE, MORPHOLOGY, LIGNIN, FUEL
  • Dokuz Eylül University Affiliated: Yes


Hydrothermal carbonization (HTC) is an important thermochemical process where biomass is converted into coal-like solid products known as hydrochars. The HTC process is performed in hot-compressed water under self-generated pressures. In this work, the HTC of acorn shells was conducted at various temperatures and reaction times with and without boric acid (H3BO3). A high degree of carbonization occurred at 250 degrees C in non-catalytic and catalytic 4-h runs. Hydrochars obtained from non-catalytic and catalytic runs at 250 degrees C consisted of spherically carbon particles with diameters ranging from 303 nm to 3.27 mu m. Carbon spheres at 200 and 225 degrees C for 2 h were not observed. The yield and carbon content of the hydrochars were slightly increased by reuse of the process water in thermal runs without catalysts.