Hydrothermal liquefaction of microalgae for biocrude production: Improving the biocrude properties with vacuum distillation

Eboibi, B. E.; Lewis, David M.; Ashman, Peter J.; Chinnasamy, Senthil

doi:10.1016/j.biortech.2014.10.029

Cited by 86 publications

(23 citation statements)

References 35 publications

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“…The residue obtained from the present study were found to be about 5wt% to 14wt% higher compared to that derived from vacuum distillation in a previous report (Eboibi et al, 2014b), where 10wt% residue were reported under optimum operating condition. The variation could be due to the fact that fractional distillation being a unit operation is mostly meant for distillation of low boiling compounds.…”

Section: Eboibi Becontrasting

confidence: 64%

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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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Section: Eboibi Becontrasting

confidence: 64%

“…Using a similar equation (Eq. 2), the species mass balances were calculated but after replacing the higher heating values of product and feedstocks with the elemental composition of a particular specie (Eboibi et al, 2014b;Neveuz et al, 2014…”

Section: Eboibi Bementioning

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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“…The process yielded 81.9% of upgraded oil with pressure as low as 4.2 MPa. Eboibi et al [8] improved bio-crude properties with vacuum distillation (353-373 K, 100 kPa). The process resulted in large reduction in metal contents and 97% deoxygenation of bio-crude, and the distilled bio-crude yield was up to 73%.…”

Section: Introductionmentioning

confidence: 99%

“…Bio-crude has abundant heavy components according to the molecular weight distribution [4][5][6] and boiling range distribution [7,8]. Biocrude is composed of hydrocarbons (almost no alkanes) [9] and various oxygenated and nitrogenous compounds, especially heterocyclic compounds [10].…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric and kinetic analysis of bio-crude from hydrothermal liquefaction of Enteromorpha prolifera

2016

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“…Microalgae are of considerable interest for the production of next-generation biofuels [1,2] that are indistinguishable from petroleum fuels based on their properties [3]. This is because using microalgae for biofuel production would have fewer adverse effects on food supply and other agriculture [4,5] as…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Physical and Chemical Properties for Microalgae HTL Bio-Crude Using a Large Batch Reactor

et al. 2017

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As a biofuel feedstock, microalgae has good scalability and potential to supply a significant proportion of world energy compared to most types of biofuel feedstock. Hydrothermal liquefaction (HTL) is well-suited to wet biomass (such as microalgae) as it greatly reduces the energy requirements associated with dewatering and drying. This article presents experimental analyses of chemical and physical properties of bio-crude oil produced via HTL using a high growth-rate microalga Scenedesmus sp. in a large batch reactor. The overarching goal was to investigate the suitability of microalgae HTL bio-crude produced in a large batch reactor for direct application in marine diesel engines. To this end we characterized the chemical and physical properties of the bio-crudes produced. HTL literature mostly reports work using very small batch reactors which are preferred by researchers, so there are few experimental and parametric measurements for bio-crude physical properties, such as viscosity and density. In the course of this study, a difference between traditionally calculated values and measured values was noted. In the parametric study, the bio-crude viscosity was significantly closer to regular diesel and biodiesel standards than transesterified (FAME) microalgae biodiesel. Under optimised conditions, HTL bio-crude's high density (0.97-1.04 kg·L −1 ) and its high viscosity (70.77-73.89 mm 2 ·s −1 ) had enough similarity to marine heavy fuels. although the measured higher heating value, HHV, was lower (29.8 MJ·kg −1 ). The reaction temperature was explored in the range 280-350 • C and bio-crude oil yield and HHV reached their maxima at the highest temperature. Slurry concentration was explored between 15% and 30% at this temperature and the best HHV, O:C, and N:C were found to occur at 25%. Two solvents (dichloromethane and n-hexane) were used to recover the bio-crude oil, affecting the yield and chemical composition of the bio-crude.

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Hydrothermal liquefaction of microalgae for biocrude production: Improving the biocrude properties with vacuum distillation

Cited by 86 publications

References 35 publications

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

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

Thermogravimetric and kinetic analysis of bio-crude from hydrothermal liquefaction of Enteromorpha prolifera

Experimental Investigations of Physical and Chemical Properties for Microalgae HTL Bio-Crude Using a Large Batch Reactor

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