Catalytic valorization of starch-rich food waste into hydroxymethylfurfural (HMF): Controlling relative kinetics for high productivity

Iris K.M. Yu, Chiu Wa Tsang, Alex C.K. Yip, Season S. Chen, Lei Wang, Yong Sik Ok, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

81 Citations (Scopus)

Abstract

� 2017 Elsevier Ltd This study aimed to maximize the valorization of bread waste, a typical food waste stream, into hydroxymethylfurfural (HMF) by improving our kinetic understanding. The highest HMF yield (30�mol%) was achieved using SnCl4as catalyst, which offered strong derived Br�nsted acidity and moderate Lewis acidity. We evaluated the kinetic balance between these acidities to facilitate faster desirable reactions (i.e., hydrolysis, isomerization, and dehydration) relative to undesirable reactions (i.e., rehydration and polymerization). Such catalyst selectivity of SnCl4, AlCl3, and FeCl3was critical in maximizing HMF yield. Higher temperature made marginal advancement by accelerating the undesirable reactions to a similar extent as the desirable pathways. The polymerization-induced metal-impregnated high-porosity carbon was a possible precursor of biochar-based catalyst, further driving up the economic potential. Preliminary economic analysis indicated a net gain of USD 43-236 per kilogram bread waste considering the thermochemical-conversion cost and chemical-trading revenue.
Original languageEnglish
Pages (from-to)222-230
Number of pages9
JournalBioresource Technology
Volume237
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • 5-Hydroxymethylfurfural
  • Acid-catalyzed reaction
  • Biorefinery
  • Food waste
  • Waste valorization

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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