Preparation of Calcium Magnesium Acetate Deicer Using Raw Acetic Acid-Rich Bio-oil Obtained from Continuous Two-Stage Pyrolysis of Corncob

Seung Jin Oh, Gyung Goo Choi, Joo Sik Kim

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Two-stage pyrolysis of corncob was performed to simultaneously produce acetic acid-rich and phenolic-rich bio-oils. The two-stage pyrolyzer consisted of an auger reactor and a fluidized bed reactor connected in series. The temperature of the auger reactor was varied between 320 and 400 °C, whereas that of the fluidized bed reactor was fixed at about 520 °C. The total bio-oil yield was over 50 wt %. The bio-oil produced from the auger reactor contained up to 48 wt % acetic acid based on the relative response factor method and low concentrations of lignin degradation products. In contrast, the bio-oil produced from the fluidized bed reactor was enriched with phenolic compounds with a maximum phenol concentration of about 19 wt %. Further, the acetic acid-rich bio-oil was used for the synthesis of calcium magnesium acetate (CMA), a nonchloride deicer, without any post-treatments for acetic acid separation or enrichment. CMA synthesized using bio-oil was chemically identical to the reference CMA. On the other hand, biochar, a byproduct, was activated using CO2 to produce microporous activated carbon with a BET surface area of about 580 m2/g. In summary, it was possible to produce value-added products (CMA and activated carbon) from the continuous two-stage pyrolysis of corncob.

Original languageEnglish
Pages (from-to)4362-4369
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number3
DOIs
StatePublished - 5 Mar 2018

Keywords

  • Activated carbon
  • Bio-oil
  • Calcium magnesium acetate
  • Pyrolysis
  • Two stage pyrolyzer

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