A review on fast hydrothermal liquefaction of biomass. (1st November 2022)

• Record Type: Journal Article
• Authors: Ni, Jun; Qian, Lili; Wang, Yanxin; Zhang, Bo; Gu, Heng; Hu, Yamin; Wang, Qian
• Is Part Of: Fuel. Volume 327(2022)
• Publication Date: 2022-11-01
• Subjects: Biomass -- Fast hydrothermal liquefaction -- Biocrude -- Aqueous phase -- Reaction kinetics -- CFD; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.125135
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: First comprehensive review on fast HTL of biomass. Effects of biomass property and HTL parameter on biocrude production were overviewed. Yields and properties of biocrude and AP from isothermal and fast HTL were compared. Fast HTL led to biocrude yields of 4.1–93.1 wt% (∼3.3 wt% higher than isothermal HTL). Seven reaction kinetics applicable to isothermal and fast HTL were summarized. Abstract: Hydrothermal liquefaction (HTL) is one of the most promising processes for the production of liquid biofuel as it can directly and efficiently convert wet biomass into biocrude with high heating values and avoid the energy-intensive drying process. Compared with conventional isothermal HTL, fast HTL utilizes a rapid heating process to avoid unfavorable secondary reactions and achieves a higher biocrude yield in short reaction times. This paper summarized the effects of biomass composition, moisture content, heating rate, temperature, holding time and pressure on the yield and composition of biocrude from fast HTL. Recoveries of nutrients such as carbon, nitrogen and phosphorus in aqueous phase products under isothermal and fast HTL conditions were compared. In addition, reaction kinetic networks of fast HTL and computational fluid dynamics modeling of the reactor were also reviewed. Future research directions were finally proposed to realize the industrialization of fast HTL.