Prediction model of biocrude yield and nitrogen heterocyclic compounds analysis by hydrothermal liquefaction of microalgae with model compounds

Sheng, Lili; Wang, Xin; Yang, Xiaoyi

doi:10.1016/j.biortech.2017.08.011

Cited by 91 publications

(36 citation statements)

References 34 publications

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“…Besides, the fraction of biooil from the aqueous phase, bio-oil yield and the energy recovery in the biooil [146] can be calculated as follows: Since HTL bio-crude is derived from an organic material, it contains many oxygenated organic chemicals present including Nitrogenates, alkanes, phenolics, esters, ketones, aromatics and heterocyclics, aldehydes and carboxylic acids. Table S1 represents the various chemical groups, from biomass derived biocrude which is subjected to GC-MS.…”

Section: Product Identification and Separationmentioning

confidence: 99%

Lignocellulosic and algal biomass for bio-crude production using hydrothermal liquefaction: Conversion techniques, mechanism and process conditions: A review

Venkatachalam¹,

Ravichandran²,

Sengottian³

2021

Environmental Engineering Research

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Thermochemical conversion is an effective process in production of biocrude. It mainly includes techniques such as torrefaction, liquefaction, gasification and pyrolysis in which Hydrothermal Liquefaction (HTL) has the potential to produce significant energy resource. Algae, one of the third-generation feedstocks is placed in the top order for production of bio-oil compared to the first and second-generation feedstock, as the algae can get multiplied in shorter time with the uptake of greenhouse gases. In HTL, the subcritical water helps the biomass to undergo thermal depolymerisation and produce various chemicals such as nitrogenates, alkanes, phenolics, esters, etc. The produced “biocrude” or “bio-oil” may be further upgraded into value-added chemicals and fuels. In addition, the bio-gas and bio-char are also synthesized as by-products. This review provides an overview of different routes available for thermochemical conversion of biomass. It also provides an insight on the operating parameters such as temperature, pressure, dosage of catalyst and solvent for lignocellulosic and algal biomass under HTL environment. In extent, the article covers the conversion mechanism for these two feedstocks and also the effects of the operating parameters on the yield of biocrude are studied in detail.

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Section: Product Identification and Separationmentioning

confidence: 99%

Lignocellulosic and algal biomass for bio-crude production using hydrothermal liquefaction: Conversion techniques, mechanism and process conditions: A review

Venkatachalam¹,

Ravichandran²,

Sengottian³

2021

Environmental Engineering Research

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“…The resultant DCM fractions were added to the biocrude phase containing DCM. The combined biocrude phase were subjected to 40 o C to evaporate DCM and water, the remnant defined as biocrude (Sheng et al, 2018). The aqueous and residue were quantified after drying at 100 o C in accordance to (Eboibi et al, 2014a;Yang et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

“…Importantly, it avoids energy-intensive (Cheng et al, 2018;Wagner et al, 2017) normally applied to processes such as transesterification and pyrolysis for biofuels production. HTL of microalgae is carried out at subcritical operating conditions (200 o C to 374 o C), pressures 5-25MPa, using biomass of 10wt% to 20wt% solids, with/or without catalyst and water acting as both solvent and catalyst, at vary reaction times (Wang et al, 2018;Fushimi and Umeda, 2016). HTL products include biocrude, solid residue, aqueous phase and gas phase.…”

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confidence: 99%

Assessing yield and properties of distillate from biocrude and blend after hydrothermal liquefaction of microalgae

Eboibi¹

2018

Journal of Applied Sciences and Environmental Management

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This paper is on assessing yield and properties of distillate derived from biocrude, and blend stream of biocrude and conventional petroleum. Biocrude was produced from hydrothermal liquefaction of a halophytic microalga Tetraselmis sp. at 350 o C, 5min with 16w/v% solids content. The resultant biocrude was coprocessed with petroleum using fractional distillation. The result of the study shows that similar yield and quality distillate were obtained from petroleum and blended stream. Distillate fraction obtained from the blend had similar properties such as higher heating values (HHV), H/C atomic ratio and elemental composition to those of petroleum crude. The energy density of biocrude-distillate significantly improved from 72.4MJ/kg to 86.9MJ/kg with about 97% reduction in oxygen content. Recovery of gasoline fractions with normal boiling point range of 190 o C to 290 o C were found higher in petroleum and blend compared to biocrude. This finding is important as coprocessing blend of biocrude and petroleum would address the issues with heteroatoms, which could be of great economic importance. However further studies are necessary on distillate fractions, in order to assure compatibility with petroleum derived fuels.

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“…The digestate residue investigated as a feedstock for the HTL was obtained from the ACD bioreactor that presented the highest biomethane potential. The yields of the products, namely biocrude, insoluble solid residue (also called biochar), soluble solids dissolved in the post-HTL water and the gas phase products, obtained after the HTL processing of the wet digestate, were estimated using predictive models [44][45][46]. According to the recent work of Sheng et al [46], the optimal yield of the biocrude product (y bio ) on a dry basis (wt.%, percentage of kg product/kg of dry digestate) can be estimated as follows:…”

Section: Preliminary Assessment Of the Alternative One-step Digestatementioning

confidence: 99%

Prognostic Assessment of the Viability of Hydrothermal Liquefaction as a Post-Resource Recovery Step after Enhanced Biomethane Generation Using Co-Digestion Technologies

2018

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In line with global efforts at encouraging paradigm transitions from waste disposal to resource recovery, the anaerobic co-digestion of substrates of wet hydrolyzed meat processing dissolved air flotation sludge and meat processing stock yard waste was investigated in the present study. It was demonstrated that the co-digestion of these substrates leads to the introduction of co-digestion synergizing effects. This study assessed biomethane potentials of the co-digestion of different substrate mixtures, with the preferred substrate mixture composed of stockyard waste and wet hydrolyzed meat processing dissolved air flotation sludge, present in a 4:1 ratio on a volatile solid mass basis. This co-digestion substrate mix ratio presented an experimentally determined cumulative biomethane potential of 264.13 mL/gVSadded (volatile solid). The experimentally determined cumulative biomethane potential was greater than the predicted maximum cumulative biomethane potential of 148.4 mL/gVSadded, anticipated from a similar substrate mixture if synergizing effects were non-existent. The viability of integrating a downstream hydrothermal liquefaction processing of the digestate residue from the co-digestion process, for enhanced resource recovery, was also initially assessed. Assessments were undertaken via the theoretical based estimation of the yields of useful products of biocrude and biochar obtainable from the hydrothermal liquefaction processing of the digestate residue. The environmental sustainability of the proposed integrated system of anaerobic digestion and hydrothermal liquefaction technologies was also initially assessed. The opportunity for secondary resource recovery from the digestate, via the employment of the hydrothermal liquefaction process and the dependence of the environmental sustainability of the integrated system on the moisture content of the digestate, were established. It is anticipated that the results of this study will constitute an invaluable basis for the future large-scale implementation of the proposed integrated system for enhanced value extraction from organic waste streams.

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Prediction model of biocrude yield and nitrogen heterocyclic compounds analysis by hydrothermal liquefaction of microalgae with model compounds

Cited by 91 publications

References 34 publications

Lignocellulosic and algal biomass for bio-crude production using hydrothermal liquefaction: Conversion techniques, mechanism and process conditions: A review

Lignocellulosic and algal biomass for bio-crude production using hydrothermal liquefaction: Conversion techniques, mechanism and process conditions: A review

Assessing yield and properties of distillate from biocrude and blend after hydrothermal liquefaction of microalgae

Prognostic Assessment of the Viability of Hydrothermal Liquefaction as a Post-Resource Recovery Step after Enhanced Biomethane Generation Using Co-Digestion Technologies

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