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Biomass Conversion and Biorefinery

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29.12.2017 | Original Article

Ultrasonic pretreatment for low-temperature hydrothermal liquefaction of microalgae: enhancing the bio-oil yield and heating value

verfasst von: Mohammad Saber, Abooali Golzary, Hu Wu, Fumitake Takahashi, Kunio Yoshikawa

Erschienen in: Biomass Conversion and Biorefinery | Ausgabe 3/2018

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Abstract

We investigated the effect of ultrasonic pretreatment on the bio-oil yield and heating value in the low-temperature hydrothermal liquefaction (HTL) of microalgae. HTL is one of the thermochemical processes for bio-oil production. However, the high pressure of the process is one of the main challenges for commercialization. On the other hand, a decrease in the HTL pressure, and consequently a decrease in the temperature, results in a decrease in the bio-oil yield. In this work, we investigated a new method to increase the bio-oil yield at low pressures and temperatures. The microalgae (Nannochloropsis sp.) were first pretreated by ultrasonic waves for 30, 60, and 90 s at 100 W. After then, the bio-oil was produced using HTL at 210, 230, and 250 °C. According to the results, using ultrasonic-assisted HTL increased the bio-oil yield up to the maximum of 28.9% (90-s sonication time at 250 °C). Moreover, applying ultrasonic pretreatment resulted in a decrease in oxygen content of the bio-oil and consequently an increase in its heating value. However, the average nitrogen content did not change dramatically by using ultrasonic-assisted hydrothermal liquefaction.

Vorheriger Artikel Enzymatic production of wheat and ryegrass derived xylooligosaccharides and evaluation of their in vitro effect on pig gut microbiota

Nächster Artikel Characterization of acid-leaching cocoa pod husk (CPH) and its resulting activated carbon

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Titel: Ultrasonic pretreatment for low-temperature hydrothermal liquefaction of microalgae: enhancing the bio-oil yield and heating value
verfasst von: Mohammad Saber
Abooali Golzary
Hu Wu
Fumitake Takahashi
Kunio Yoshikawa
Publikationsdatum: 29.12.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: Biomass Conversion and Biorefinery / Ausgabe 3/2018
Print ISSN: 2190-6815
Elektronische ISSN: 2190-6823
DOI: https://doi.org/10.1007/s13399-017-0300-8

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