Journal article
Impact of reaction conditions on the simultaneous production of polysaccharides and bio-oil from heterotrophically grown Chlorella sorokiniana by a unique sequential hydrothermal liquefaction process
Bioresource technology, Vol.110, pp.617-627
04/2012
Handle:
https://hdl.handle.net/2376/115560
PMID: 22330592
Abstract
► Polysaccharides and bio-oil are extracted concomitantly by a novel sequential hydrothermal liquefaction (SEQHTL). ► By SEQHTL, optimal bio-oil production is achieved at much lower temperature than direct hydrothermal liquefaction (DHTL). ► SEQHTL produces 50% less bio-char than DHTL. ► SEQHTL requires less energy and has higher thermal efficiency than DHTL.
A two-step sequential hydrothermal liquefaction (SEQHTL) model for simultaneous extraction of polysaccharide at the first step followed by bio-oil in the second was established. The effects of reaction temperature, residence time, and biomass/water ratio on the product distribution of each SEQHTL step were evaluated. Maximum yield (32wt.%) of polysaccharides was obtained at 160°C, 20min and 1:9 biomass/water ratio. Considering the operation cost and bio-oil yield (>30%); 240°C, 20min and 1:9 biomass/water ratio was preferred as ideal SEQHTL condition for bio-oil extraction. SEQHTL always produced ∼5% more bio-oil and ∼50% less bio-char than direct hydrothermal liquefaction (DHTL). Free fatty acid content of the bio-oils exhibited a sharp decrease with increase in temperature. Comparative analysis of the energy input and net energy balance showed that SEQHTL requires ∼15% less MJ/kg bio-oil than DHTL. Energy recovery rate for SEQHTL is nearly 4% higher than the DHTL.
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Details
- Title
- Impact of reaction conditions on the simultaneous production of polysaccharides and bio-oil from heterotrophically grown Chlorella sorokiniana by a unique sequential hydrothermal liquefaction process
- Creators
- Chao MiaoMoumita ChakrabortyShulin Chen
- Publication Details
- Bioresource technology, Vol.110, pp.617-627
- Academic Unit
- Biological Systems Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900548090401842
- Language
- English
- Resource Type
- Journal article