Hydrothermal Liquefaction of Biomass as One of the Most Promising Alternatives for the Synthesis of Advanced Liquid Biofuels: A Review

Grande, Lucía; Pedroarena, Ivan; Korili, S.A.; Gil, A.

doi:10.3390/ma14185286

“…Catalysts can influence the HTL processes to improve the bio-oil yield and properties, decrease the hydrochar yield [58], reduce operation times, hindering secondary reactions, and reduce pressure and temperature dependency of the process [63]. The effect on the process is influenced by the type of catalyst, process conditions and biomass used [59].…”

Section: Hydrothermal Liquefactionmentioning

confidence: 99%

“…The effects of different parameters and catalysts application on HTL yield and products characteristics has been well reviewed by different authors [57], [58], [60]- [62], [66], [67].…”

Section: Hydrothermal Liquefactionmentioning

confidence: 99%

A review on the interplay between bioeconomy and soil organic carbon stocks maintenance.

Díaz

¹

,

Albers

²

,

Zamora-Ledezma

³

et al. 2022

Preprint

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Crop residues potential for the bioeconomy is often limited under the basis of avoiding prospective soil organic carbon depletion. However, when processed in the bioeconomy the biomass carbon can be partially recovered in a stabilized degradation-resistant state in the coproducts. This study interlinks the theoretical basis between the coproducts’ characteristics and behavior in soils and the use of soil models to predict the effect of replacing crop residues with bioeconomy coproducts. Stemming from a revision of over 600 datasets we defined conversion coefficients from biomass C to coproduct (Cc) and their inherent recalcitrance in soils (CR) for pyrolysis (Cc: 48%, CR: 95%) and gasification biochar (Cc: 20%, CR: 95%), hydrochar (Cc: 31%, CR: 83%), digestate (Cc: 36%, CR: 68%) and lignocellulosic bioethanol solid (Cc: 44%, CR: 42%) and liquid (Cc: 21%, CR: 46%) coproducts. Different approaches to incorporate stabilized organic matter in soil models were investigated as well as the data requirements of a variety of soil models to set the basis for model adaptation in a dynamic harvest – return of C to explore future scenarios involving the coproducts return as a strategy to increase the bioeconomy feedstock provision while ensuring the maintenance of SOC stocks.

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“…Hydrothermal Liquefaction (HTL) is a thermochemical process carried out in a liquid-phase media, acknowledge as a promising technology for biofuels production, alternative to pyrolysis and gasification [55]- [57]. Compared to other thermochemical processes, HTL is considered a more energy effective technology as it allows the use of a wide variety of feedstocks, from lignocellulosic to algal biomass [58], without previous drying steps, it produces a biocrude with less oxygen content, yields less tar, and requires lower amounts of chemical additives and heat consumption [56],…”

Section: Hydrothermal Liquefactionmentioning

confidence: 99%

“…The effects of different parameters and catalysts application on HTL yield and products characteristics has been well reviewed by different authors [57], [58], [60]- [62], [66], [67]. However, the focus of HTL reviews has been the biocrude and when the interest is on the yields and characteristics of hydrochar the HTL literature is rather scarce since the hydrochar attention has been given to HTC.…”

Section: Hydrothermal Liquefactionmentioning

confidence: 99%

A review on the interplay between bioeconomy and soil organic carbon stocks maintenance.

Díaz

¹

,

Albers

²

,

Zamora-Ledezma

³

et al. 2022

Preprint

View full text Add to dashboard Cite

Crop residues potential for the bioeconomy is often limited under the basis of avoiding prospective soil organic carbon depletion. However, when processed in the bioeconomy the biomass carbon can be partially recovered in a stabilized degradation-resistant state in the coproducts. This study interlinks the theoretical basis between the coproducts’ characteristics and behavior in soils and the use of soil models to predict the effect of replacing crop residues with bioeconomy coproducts. Stemming from a revision of over 600 datasets we defined conversion coefficients from biomass C to coproduct (Cc) and their inherent recalcitrance in soils (CR) for pyrolysis (Cc: 48%, CR: 95%) and gasification biochar (Cc: 20%, CR: 95%), hydrochar (Cc: 31%, CR: 83%), digestate (Cc: 36%, CR: 68%) and lignocellulosic bioethanol solid (Cc: 44%, CR: 42%) and liquid (Cc: 21%, CR: 46%) coproducts. Different approaches to incorporate stabilized organic matter in soil models were investigated as well as the data requirements of a variety of soil models to set the basis for model adaptation in a dynamic harvest – return of C to explore future scenarios involving the coproducts return as a strategy to increase the bioeconomy feedstock provision while ensuring the maintenance of SOC sotcks.

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“…Generally, the utilization mode of biomass resources mainly includes the physical chemistry method represented by compression molding; the thermochemical method represented by combustion, liquefaction, gasification; and the biochemical method represented by fermentation. Among the above methods, hydrothermal liquefaction (HTL) is a thermochemical process in which biomass is treated under high pressure (5-20 MPa) at a moderate temperature (200-374 • C) [6,7]. During the HTL process, biomass feedstocks undergo hydrolysis, dehydration, repolymerization, and other reactions to produce bio-oil (HT bio-oil), water-soluble products, gases, and solids with the presence of water [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Advance in Hydrothermal Bio-Oil Preparation from Lignocellulose: Effect of Raw Materials and Their Tissue Structures

Zhang

¹

,

Dou

²

,

Yang

³

et al. 2021

Biomass

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The conversion of abundant forest- and agricultural-residue-based lignocellulosic materials into high-quality bio-oil by the mild hydrothermal method has great potential in the field of biomass utilization. Some excellent research on biomass hydrothermal process has been completed, including temperature, time, catalyst addition, etc. Meanwhile, some research related to the biomass raw material tissue structure has been illustrated by adopting mode components (cellulose, hemicellulose, lignin, protein, lipid, etc.) or their mixtures. The interesting fact is that although some real lignocellulose has approximate composition, their hydrothermal products and distributions show individual differences, which means the interaction within biomass raw material components tremendously affected the reaction pathway. Unfortunately, to our knowledge, there is no review article with a specific focus on the effects of raw materials and their tissue structure on the lignocellulose hydrothermal process. In this review, research progress on the effects of model and mixed cellulose/hemicellulose/lignin effects on hydrothermal products is initially summarized. Additionally, the real lignocellulosic raw materials structure effects during the thermal process are summed up. This article will inspire researchers to focus more attention on wood fiber biomass conversion into liquid fuels or high-value-added chemicals, as well as promote the development of world energy change.

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Hydrothermal Liquefaction of Biomass as One of the Most Promising Alternatives for the Synthesis of Advanced Liquid Biofuels: A Review

Cited by 60 publications

References 100 publications

A review on the interplay between bioeconomy and soil organic carbon stocks maintenance.

A review on the interplay between bioeconomy and soil organic carbon stocks maintenance.

A review on the interplay between bioeconomy and soil organic carbon stocks maintenance.

Advance in Hydrothermal Bio-Oil Preparation from Lignocellulose: Effect of Raw Materials and Their Tissue Structures

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