An investigation of reaction pathways of hydrothermal liquefaction using Chlorella pyrenoidosa and Spirulina platensis

Chao Gai, Yuanhui Zhang, Wan Ting Chen, Peng Zhang, Yuping Dong

Research output: Contribution to journalArticlepeer-review

Abstract

Low-lipid microalgae can be successfully converted to bio-crude oil in a hydrothermal liquefaction (HTL) environment. This study examined the behavior of hydrothermal liquefaction of two low-lipid content microalgae in subcritical water between 200 °C and 320 °C at 20 °C intervals. Under these conditions, the chemical composition and functional groups for the bio-crude oil and aqueous fraction were analyzed. Results indicated that reaction temperature greatly affected the distribution of chemical composition and functional groups of HTL bio-crude oil and aqueous fraction. The bio-crude oil with a higher percentage of aliphatic functional groups was obtained at higher reaction temperatures (280-320 °C). Besides, the aqueous fraction recovered under the same operating conditions had a lower concentration of nitrogenous organic compounds (NOCs) with two or more methyl groups. The general reaction network for HTL of low-lipid microalgae was proposed. The specific reaction pathways for microalgae substrates were analyzed in terms of lipid, protein and non-fibrous carbohydrate based on the spectral analysis.

Original languageEnglish (US)
Pages (from-to)330-339
Number of pages10
JournalEnergy Conversion and Management
Volume96
DOIs
StatePublished - May 15 2015

Keywords

  • Biofuel
  • Chlorella
  • Hydrothermal liquefaction
  • Low-lipid microalgae
  • Spirulina

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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