Effect of solvent on the hydrothermal liquefaction of macro algae Ulva fasciata

Singh, Rawel; Bhaskar, Thallada; Balagurumurthy, Bhavya

doi:10.1016/j.psep.2014.03.002

Cited by 98 publications

(41 citation statements)

References 21 publications

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“…26 Using organic solvents, either in neat form or as cosolvents, has been shown to significantly increase biocrude yields. 13,21,25 However, one study reported that lower biocrude quality accompanied the higher yields. 21 When an alcohol is used as the sole solvent, it has the advantage that HTL can be performed under supercritical conditions at much lower temperatures and pressures compared to using water as a solvent.…”

Section: Resultsmentioning

confidence: 99%

Pilot-Scale Continuous-Flow Hydrothermal Liquefaction of Filamentous Fungi

2016

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This study examined the potential of using the filamentous fungus Rhizopus oligosporus as a feedstock for hydrothermal liquefaction (HTL). The fungal biomass, cultivated in thin stillage from a corn ethanol plant, was processed at pilot-scale using a 1.5-L capacity continuous-flow HTL system. HTL operating conditions of 300−400°C at 27 MPa for 12−30 min were tested. Biocrude yields ranging from 48.2 to 60.9% were obtained. At low reaction temperatures (300°C), yields as high as 59.9% could still be achieved. Aside from the least severe reaction condition studied (300°C, 12 min), neither the yield nor elemental composition of the biocrude was significantly impacted by residence time or temperature, as is typically seen with batch reactors. Similarities in the biochemical and elemental composition between R. oligosporus and microalgae resulted in biocrude yields that were comparable to those previously reported for continuous-flow systems using microalgae. These findings demonstrate the viability of using fungal biomass as a feedstock for the HTL process, and they show that lower temperatures can be used at pilot-scale while still achieving maximal yields.

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Section: Resultsmentioning

confidence: 99%

Pilot-Scale Continuous-Flow Hydrothermal Liquefaction of Filamentous Fungi

2016

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“…The solid residues can be used as asphalt [36] and/or fertilizer [11] if N partitions into the solid phase during the SWE process. FTIR spectra of solid residue from SWE of Ulva fasciata were presented by Singh et al [63]. The macroalga carbohydrates and proteins were indicated by O-H and N-H bonds observed from broad bands around 3406 cm À1 .…”

Section: Solid Residuementioning

confidence: 99%

Process application of Subcritical Water Extraction (SWE) for algal bio-products and biofuels production

et al. 2015

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“…High reactivity and superior ionic product (K w ) of subcritical water break down biomass complex polymers including polysaccharides, lipids, and proteins into simpler molecules that can be converted into bio-oils with different viscosities (Peterson et al, 2008;Villadsen et al, 2012) depending on the catalysts, solvents, feedstock composition, and pretreatment methods employed. Neveux et al, 2014;Singh et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Demineralization of Sargassum spp. Macroalgae Biomass: Selective Hydrothermal Liquefaction Process for Bio-Oil Production

et al. 2015

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Algae biomasses are considered a viable option for the production of biofuel because of their high yields of oil produced per dry weight. Brown macroalgae Sargassum spp. are one of the most abundant species of algae in the shores of Puerto Rico. Its availability in large quantity presents a great opportunity for use as a source of renewable energy. However, high ash content of macroalgae affects the conversion processes and the quality of resulting fuel products. This research studied the effect of different demineralization treatments of Sargassum spp. biomass, subsequent hydrothermal liquefaction (HTL), and bio-oil characterization. Demineralization constituted five different treatments: nanopure water, nitric acid, citric acid, sulfuric acid, and acetic acid. Performance of demineralization was evaluated by analyzing both demineralized biomass and HTL products by the following analyses: total carbohydrates, proteins, lipids, ash content, caloric content, metals analysis, Fourier transform infrared-attenuated total reflectance spectroscopy, energy dispersive spectroscopy, scanning electron microscopy, and GCMS analysis. HTL of Sargassum spp. before and after citric acid treatment was performed in a 1.8 L batch reactor system at 350°C with a holding time of 60 min and high pressures (5-21 MPa). Demineralization treatment with nitric acid was found the most effective in reducing the ash content of the macroalgae biomass from 27.46 to 0.99% followed by citric acid treatment that could reduce the ash content to 7%. Citric acid did not show significant leaching of organic components such as carbohydrates and proteins, and represented a less toxic and hazardous option for demineralization. HTL of untreated and citric acid treated Sargassum spp. resulted in bio-oil yields of 18.4 0.1 and 22.2 0.1% (ash-free dry basis), respectively. ± ±

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Effect of solvent on the hydrothermal liquefaction of macro algae Ulva fasciata

Cited by 98 publications

References 21 publications

Pilot-Scale Continuous-Flow Hydrothermal Liquefaction of Filamentous Fungi

Pilot-Scale Continuous-Flow Hydrothermal Liquefaction of Filamentous Fungi

Process application of Subcritical Water Extraction (SWE) for algal bio-products and biofuels production

Demineralization of Sargassum spp. Macroalgae Biomass: Selective Hydrothermal Liquefaction Process for Bio-Oil Production

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