Effect of process conditions on bio-oil obtained through continuous hydrothermal liquefaction of Scenedesmus sp. microalgae

Wądrzyk, Mariusz; Janus, Rafał; Vos, Mathijs P.; Brilman, Wim

doi:10.1016/j.jaap.2018.07.008

Cited by 53 publications

(15 citation statements)

References 53 publications

(93 reference statements)

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“…Another lab-scale continuous HTL plant was built at the University of Twente, The Netherlands [67]. This system features a tubular reactor of 5.5 m length with an internal diameter of 3 mm, for a total volume of ca.…”

Section: Bench-scale Plantsmentioning

confidence: 99%

Continuous Hydrothermal Liquefaction of Biomass: A Critical Review

2018

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Hydrothermal liquefaction (HTL) of biomass is emerging as an effective technology to efficiently valorize different types of (wet) biomass feedstocks, ranging from lignocellulosics to algae and organic wastes. Significant research into HTL has been conducted in batch systems, which has provided a fundamental understanding of the different process conditions and the behavior of different biomass. The next step towards continuous plants, which are prerequisites for an industrial implementation of the process, has been significantly less explored. In order to facilitate a more focused future development, this review—based on the sources available in the open literature—intends to present the state of the art in the field of continuous HTL as well as to suggest means of interpretation of data from such plants. This contributes to a more holistic understanding of causes and effects, aiding next generation designs as well as pinpointing research focus. Additionally, the documented experiences in upgrading by catalytic hydrotreating are reported. The study reveals some interesting features in terms of energy densification versus the yield of different classes of feedstocks, indicating that some global limitations exist irrespective of processing implementations. Finally, techno-economic considerations, observations and remarks for future studies are presented.

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Section: Bench-scale Plantsmentioning

confidence: 99%

Continuous Hydrothermal Liquefaction of Biomass: A Critical Review

2018

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“…In order to isolate the bio-oil from as-received reaction mixture, the typical procedure of the extraction with dichloromethane (DCM; Sigma Aldrich 99.9%) was employed, according to the method reported elsewhere [16]. Ultimately, four following products were isolated from the reaction mixture: (i) bio-oil; (ii) water phase containing dissolved polar organics; (iii) volatile phase; and (iv) solid residue.…”

Section: Product Separationmentioning

confidence: 99%

“…The contributions of the detected compounds were computed relatively as a ratio of peak area of particular compound to the summary peak area of all detected components. The detailed information concerning the FT-IR, GPC and GC-MS analysis procedures and samples preparation were reported previously [16].…”

Section: Product Analysismentioning

confidence: 99%

Hydrothermal processing of pine wood: effect of process variables on bio-oil quality and yield

et al. 2019

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Hydrothermal liquefaction processes (HTL) comprise complex chemical and physical transformations of biomass under the conditions of high temperature and pressure, commonly near- or supercritical water. During this processes, the components of biomass undergo various complicated chemical reactions strongly influenced by process variables. In this study, lignocellulosic biomass (pine wood) has been converted via liquefaction in subcritical water to bio-oil, water-soluble organics, gas and solid products. The process parameters (i.e. temperature and time processing) affecting the bio-oil yields and composition were comparatively studied. The chemical composition of resulting bio-oils was analyzed by means of mid-infrared spectroscopy, gel permeation chromatography, gas chromatography coupled to mass spectrometry and elemental analysis. The maximum bio-oil yield (38.35 wt.%) was obtained at 350 ºC for 10 min. The HHV of the obtained resultant bio-oils varied in the range of 24-28 MJ kg-1. Bio-oils from HTL of pine wood are complex mixtures of aromatic and cyclic compounds with numerous hydroxyl and carboxyl functional groups. The experiments exhibited that the increase in the temperature results in adeeper decomposition of biomass manifested by the higher yield of bio-oil and its gradual deoxygenation. In fact, the obtained oil products are promising, valuable intermediates, which may act as a source of many valueadded chemicals.

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“…Despite the advantages of HTL, the biocrude composition from HTL of algae is also complex. To gain a high biocrude yield, HTL treatment usually conducts at high temperatures (>300 • C) [89,90]. The dissolution of proteins or saccharides which contain a high proportion of N and O makes the quality of biocrude reduced and limits its commercialization [91].…”

Section: Biocrude From Direct Hydrothermal Liquefactionmentioning

confidence: 99%

Catalytic Thermochemical Conversion of Algae and Upgrading of Algal Oil for the Production of High-Grade Liquid Fuel: A Review

Zhou

2020

Catalysts

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The depletion of fossil fuel has drawn growing attention towards the utilization of renewable biomass for sustainable energy production. Technologies for the production of algae derived biofuel has attracted wide attention in recent years. Direct thermochemical conversion of algae obtained biocrude oil with poor fuel quality due to the complex composition of algae. Thus, catalysts are required in such process to remove the heteroatoms such as oxygen, nitrogen, and sulfur. This article reviews the recent advances in catalytic systems for the direct catalytic conversion of algae, as well as catalytic upgrading of algae-derived oil or biocrude into liquid fuels with high quality. Heterogeneous catalysts with high activity in deoxygenation and denitrogenation are preferable for the conversion of algae oil to high-grade liquid fuel. The paper summarized the influence of reaction parameters and reaction routes for the catalytic conversion process of algae from critical literature. The development of new catalysts, conversion conditions, and efficiency indicators (yields and selectivity) from different literature are presented and compared. The future prospect and challenges in general utilization of algae are also proposed.

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Effect of process conditions on bio-oil obtained through continuous hydrothermal liquefaction of Scenedesmus sp. microalgae

Cited by 53 publications

References 53 publications

Continuous Hydrothermal Liquefaction of Biomass: A Critical Review

Continuous Hydrothermal Liquefaction of Biomass: A Critical Review

Hydrothermal processing of pine wood: effect of process variables on bio-oil quality and yield

Catalytic Thermochemical Conversion of Algae and Upgrading of Algal Oil for the Production of High-Grade Liquid Fuel: A Review

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