BioChem - DOS

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 : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Miao, C.; Chakraborty, M.; Chen, S.

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<SUP>o</SUP>C, 20min and 1:9 biomass/water ratio. Considering the operation cost and bio-oil yield (>30%); 240<SUP>o</SUP>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.

2012

Elsevier Applied Science

0960-8524

110

pp.617-627

10.1016/j.biortech.2012.01.047

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART62400006

Sequential hydrothermal liquefaction; Polysaccharides; Chlorella sorokiniana; Bio-oil; Thermal efficiency