Production of low-nitrogen bio-crude oils from microalgae pre-treated with pre-cooled NaOH/urea solution

被引:23
作者
Hu, Yulin [1 ]
Feng, Shanghuan [1 ]
Xu, Chunbao [1 ]
Bassi, Amarjeet [1 ]
机构
[1] Univ Western Ontario, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Microalgae; Pre-treatment; NaOH/urea solution; Diluted acid; Hydrothermal liquefaction; Bio-crude oil; Solid residue; HYDROTHERMAL LIQUEFACTION; ALKALINE PRETREATMENT; DISSOLUTION; CELLULOSE; ENERGY;
D O I
10.1016/j.fuel.2017.06.021
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In this study, a novel two-stage hydrothermal liquefaction (HTL) process was employed to produce low-nitrogen bio-crude oils from microalgae, involving pre-treatment of the microalgae with a pre-cooled NaOH/urea solution or a dilute acid and HTL of the pre-treated algal feedstock at 250 degrees C for 10-50 min. The results indicated that the pre-treatment with a pre-cooled NaOH/urea solution effectively removed carbohydrates and protein from the raw microalgae, leading to a decrease in carbohydrates and protein content by 12 wt% and 10 wt% (both absolute values), respectively, while retaining 70 wt% of the solid mass, corresponding to as high as 82% carbohydrates removal efficiency and 40% protein removal efficiency. The two-stage HTL process slightly increased the overall bio-crude oil yields relative to the conventional single-stage HTL process, and the bio-crude oils obtained from the two-stage HTL process have a better quality than those obtained from the single-stage HTL, in terms of lower nitrogen and oxygen levels and higher energy content. (C) 2017 Published by Elsevier Ltd.
引用
收藏
页码:300 / 306
页数:7
相关论文
共 26 条
[1]   Hydrothermal liquefaction of the brown macro-alga Laminaria Saccharina: Effect of reaction conditions on product distribution and composition [J].
Anastasakis, K. ;
Ross, A. B. .
BIORESOURCE TECHNOLOGY, 2011, 102 (07) :4876-4883
[2]   Hydrothermal liquefaction (HTL) of microalgae for biofuel production: State of the art review and future prospects [J].
Barreiro, Diego Lopez ;
Prins, Wolter ;
Ronsse, Frederik ;
Brilman, Wim .
BIOMASS & BIOENERGY, 2013, 53 :113-127
[3]  
Becker EW., 1994, Microalgae: Biotechnology and Microbiology
[4]   Potential yields and properties of oil from the hydrothermal liquefaction of microalgae with different biochemical content [J].
Biller, P. ;
Ross, A. B. .
BIORESOURCE TECHNOLOGY, 2011, 102 (01) :215-225
[5]   Algal biochar - production and properties [J].
Bird, Michael I. ;
Wurster, Christopher M. ;
Silva, Pedro H. de Paula ;
Bass, Adrian M. ;
de Nys, Rocky .
BIORESOURCE TECHNOLOGY, 2011, 102 (02) :1886-1891
[6]  
BLIGH EG, 1959, CAN J BIOCHEM PHYS, V37, P911
[7]   Rapid dissolution of cellulose in LiOH/Urea and NaOH/Urea aqueous solutions [J].
Cai, J ;
Zhang, L .
MACROMOLECULAR BIOSCIENCE, 2005, 5 (06) :539-548
[8]   Hydrothermal Reactions of Biomolecules Relevant for Microalgae Liquefaction [J].
Changi, Shujauddin M. ;
Faeth, Julia L. ;
Mo, Na ;
Savage, Phillip E. .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2015, 54 (47) :11733-11758
[9]   A unified correlation for estimating HHV of solid, liquid and gaseous fuels [J].
Channiwala, SA ;
Parikh, PP .
FUEL, 2002, 81 (08) :1051-1063
[10]   Upgrading of crude algal bio-oil in supercritical water [J].
Duan, Peigao ;
Savage, Phillip E. .
BIORESOURCE TECHNOLOGY, 2011, 102 (02) :1899-1906