TY - JOUR
T1 - Valorization of waste biomass through hydrothermal liquefaction: A review with focus on linking hydrothermal factors to products characteristics
AU - Fan, Qingwen
AU - Fu, Peng
AU - Song, Chaoyun
AU - Fan, Yonglei
N1 - Funding Information:
This work was supported by National Natural Science Foundation of China [ 51976112 ]; Special Project Fund of “Taishan Scholar” of Shandong Province [ tsqn202103066 ]; Zibo Key Research and Development Project [ 2019ZBXC300 ], and China Scholarship Council.
Publisher Copyright:
© 2022
PY - 2023/1
Y1 - 2023/1
N2 - Hydrothermal liquefaction (HTL) is one of the important conversion technologies from biomass to value-added products. However, the product quality is directly related to the reaction conditions and properties of raw materials. As a result, the review thoroughly examined the linking hydrothermal factor (temperature, retention time, and pressure) to products characteristics in order to systematically improve the quality of HTL products. The improvement degree of various pretreatment techniques (acid, alkali, enzyme, ozone, ultrasonic, and microwave) coupled with HTL was subsequently summarized, as well as their mechanism of breaking and depolymerizing long-chain polymers by hydrolysis or energy-assisted methods in such as lignin, cellulose, protein, and lipid. Finally, the contribution of components to calorific value and yield of products was emphasized, as well as the synergistic and antagonistic effects of model compounds. Therefore, the pretreatments of biomass are promising yet challenging in reducing N-/O-heteroatoms.
AB - Hydrothermal liquefaction (HTL) is one of the important conversion technologies from biomass to value-added products. However, the product quality is directly related to the reaction conditions and properties of raw materials. As a result, the review thoroughly examined the linking hydrothermal factor (temperature, retention time, and pressure) to products characteristics in order to systematically improve the quality of HTL products. The improvement degree of various pretreatment techniques (acid, alkali, enzyme, ozone, ultrasonic, and microwave) coupled with HTL was subsequently summarized, as well as their mechanism of breaking and depolymerizing long-chain polymers by hydrolysis or energy-assisted methods in such as lignin, cellulose, protein, and lipid. Finally, the contribution of components to calorific value and yield of products was emphasized, as well as the synergistic and antagonistic effects of model compounds. Therefore, the pretreatments of biomass are promising yet challenging in reducing N-/O-heteroatoms.
KW - Component characteristics
KW - Fundamental conditions
KW - Hydrothermal liquefaction
KW - Model compounds
KW - Pretreatment technology
UR - http://www.scopus.com/inward/record.url?scp=85142870899&partnerID=8YFLogxK
U2 - 10.1016/j.indcrop.2022.116017
DO - 10.1016/j.indcrop.2022.116017
M3 - Article
SN - 0926-6690
VL - 191
JO - Industrial Crops and Products
JF - Industrial Crops and Products
IS - Part B
M1 - 116017
ER -