Bio-oil production from hydrothermal liquefaction of waste Cyanophyta biomass: Influence of process variables and their interactions on the product distributions

Song, Wenhan; Wang, Shuzhong; Guo, Yang; Xu, Donghai

doi:10.1016/j.ijhydene.2017.06.010

Cited by 31 publications

(9 citation statements)

References 30 publications

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“…The increase in the contributions of phenols and indoles resulting from the higher temperature of the process may be due to their high stability, which is consistent with the results reported by other authors [46,47]. As the raw material was characterized by the high content of protein, a significant contribution to the bio-oil composition may originate from nitrogen-containing compounds such as amines, amides, nitriles, indoles and lactams.…”

Section: Gc-mssupporting

confidence: 90%

“…A detailed overview of these compounds as a function of the process temperature was presented in Appendix C. The main groups of the identified compounds are heterocyclic aromatics and alicyclic, higher alkanes, alkenes, amines, phenols, indoles and amides. Such set of groups of organics in biooil produced from low-lipid algae by HTL was reported previously also by others [14,[41][42][43][44][45][46][47].…”

Section: Gc-mssupporting

confidence: 80%

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

Wądrzyk

Janus

Vos

et al. 2018

Journal of Analytical and Applied Pyrolysis

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Hydrothermal liquefaction of biomass in near-/supercritical water has attracted great attention in recent years. Although this technology seems to be promising for transformation of microalgal biomass, the information on the impact of feedstock and processing variables of continuous hydrothermal liquefaction on the properties of bio-oil provided in previous literature is scarce. Herein, the low-lipid Scenedesmus sp. biomass has been transformed to bio-oils through continuous hydrothermal liquefaction under various process conditions. The influence of temperature and residence time on bio-oil characteristic was discussed based on characterization by IR, GC-MS and gel permeation chromatography. The relative degree of branching of carbon chain of bio-oils components was estimated based on deconvolution of methyl and methylene IR absorption bands. The presumptive pathways of the reactions have been postulated. Finally, it was found that the parameters of bio-oil may be tailored by adjustment of processing variables, however, possible subsequent/parallel effects must be considered while designing the process.

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Section: Gc-mssupporting

confidence: 90%

Section: Gc-mssupporting

confidence: 80%

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

Wądrzyk

Janus

Vos

et al. 2018

Journal of Analytical and Applied Pyrolysis

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“…Optimizing these factors is a major step toward producing desirable outcomes of the treatment such as high energy recovery or high carbon yield in biocrude oil with ultralow content of heteroatoms and high nutrient yield in the aqueous phase for recycling. The literature on optimizing process conditions for energy and nutrient recovery using HTL suggests a wide range of methods for different feedstocks. − …”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have suggested 280–320 °C and 15–60 min as the optimum range for reaction temperature and reaction time, respectively, to produce high bio-oil yield with high carbon content from microalgae, a mixture of model compounds, and animal manure digestate, although higher temperatures have also been reported. ,,,, Both alkaline and acidic conditions have been reported to improve the carbon recovery in biocrude oil by suppressing hydro-char formation and catalyzing oil production. − A solid concentration 10–35 wt % in the feedstock is also favored to obtain high energy recovery. ,,,, However, a high inorganic (ash) content in the feedstock has been reported to be detrimental for biomass conversion to bio-oil …”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Liquefaction of Acid Whey: Effect of Feedstock Properties and Process Conditions on Energy and Nutrient Recovery

Sudibyo

Wang

Tester

2021

ACS Sustainable Chem. Eng.

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Improper management of dairy wastewater (acid whey) leads to water basin eutrophication and greenhouse gas emissions. We evaluated hydrothermal liquefaction as a means to sustainably manage and valorize acid whey wastes by converting them into biocrude oil and recovering nutrients in aqueous-phase byproducts. In a set of well-defined experiments, we studied the effects of reaction temperatures (280−360 °C), reaction times (7.5−37.5 min), feedstock pH values (2.5−8.5), and feedstock salt contents (0−2 wt %) on the energy recovered and the yields of products and elements. Response surface analysis showed that an alkaline feedstock pH (8.5) and a short reaction time (7.5 min) combined with a specific optimal reaction temperature for certain salt content in the feedstock were required to maximize biocrude energy recovery and nutrient recovery for a range of feedstock compositions. In general, 280−290 °C was optimal for salt contents ≤1.675 wt % and 360 °C for salt contents 1.675−2 wt %. Carbon and nitrogen were mostly distributed between biocrude and aqueous-phase products, added with distribution to the gas phase at higher temperatures. Partitioning of inorganics, for example, calcium and phosphorus, into aqueous-phase and solid hydrochar products depended on reaction conditions. This study provides new information for controlling target product composition as well as specifying desirable operating conditions for practical systems.

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“…Based on this property, because of hydrolysis as the most typical ionic reaction, many scholars studied the hydrolysis of organics such as indole, phenol and guaiacol under subcritical conditions [53][54][55]. Biomass resources (such as lignin and microalgae) and wastes (such as sludge and chemical wastewater) were also gasified or partially oxidized under subcritical conditions to produce bio-oil or hydrogen and thus realize clean utilization of biomass and resource utilization of pollutants [56][57][58][59][60][61]. K w , however, drops sharply above the critical point.…”

Section: Ionic Reactions and Free Radical Reactionsmentioning

confidence: 99%

Review on Mechanisms and Kinetics for Supercritical Water Oxidation Processes

Jiang

Wang

et al. 2020

Applied Sciences

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Supercritical water oxidation (SCWO) is a promising wastewater treatment technology owing to its various advantages such as rapid reactions and non-polluting products. However, problems like corrosion and salt decomposition set obstacles to its commercialization. To address these problems, researchers have been developing the optimal reactor design and strengthening measures based on sufficient understandings of the degradation kinetics. The essence of the SCWO process and the roles of oxygen and hydrogen peroxide are summarized in this work. Then, the research status and progress of empirical models, semi-empirical models, and detailed chemical kinetic models (DCKMs) are systematically reviewed. Additionally, this paper is the first to summarize the research progress of quantum chemistry and molecular dynamics simulation. The challenge and further development of kinetics models for the optimization of reactors and the directional transformation of pollutants are pointed out.

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Bio-oil production from hydrothermal liquefaction of waste Cyanophyta biomass: Influence of process variables and their interactions on the product distributions

Cited by 31 publications

References 30 publications

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

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

Hydrothermal Liquefaction of Acid Whey: Effect of Feedstock Properties and Process Conditions on Energy and Nutrient Recovery

Review on Mechanisms and Kinetics for Supercritical Water Oxidation Processes

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