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

详细信息	查看全文 | 推荐本文 |

• 作者：Chao Miao¹ ; Moumita Chakraborty¹ ; Shulin Chen ; ^{chens@wsu.edu}
• 关键词：Sequential hydrothermal liquefaction ; Polysaccharides ; Chlorella sorokiniana ; Bio-oil ; Thermal efficiency
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：April, 2012
• 卷：110
• 期：Complete
• 页码：617-627
• 文件大小：375 K

摘要

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 (32 wt.%) of polysaccharides was obtained at 160 掳C, 20 min and 1:9 biomass/water ratio. Considering the operation cost and bio-oil yield (>30%); 240 掳C, 20 min and 1:9 biomass/water ratio was preferred as ideal SEQHTL condition for bio-oil extraction. SEQHTL always produced 鈭?%more bio-oil and 鈭?0%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 鈭?5%less MJ/kg bio-oil than DHTL. Energy recovery rate for SEQHTL is nearly 4%higher than the DHTL.