Preprint Article Version 1 This version is not peer-reviewed

Mild Hydrothermal Pretreatment of Microalgae for the Production of Biocrude with a Low N and O Content

Version 1 : Received: 30 August 2019 / Approved: 2 September 2019 / Online: 2 September 2019 (10:33:06 CEST)

How to cite: Montero-Hidalgo, M.; Espada, J.J.; Rodríguez, R.; Morales, V.; Bautista, L.F.; Vicente, G. Mild Hydrothermal Pretreatment of Microalgae for the Production of Biocrude with a Low N and O Content. Preprints 2019, 2019090021 (doi: 10.20944/preprints201909.0021.v1). Montero-Hidalgo, M.; Espada, J.J.; Rodríguez, R.; Morales, V.; Bautista, L.F.; Vicente, G. Mild Hydrothermal Pretreatment of Microalgae for the Production of Biocrude with a Low N and O Content. Preprints 2019, 2019090021 (doi: 10.20944/preprints201909.0021.v1).

Abstract

A hydrothermal pretreatment of the microalga Nannochloropsis gaditana at mild temperatures has been studied in order to reduce N and O content in the biocrude obtained by hydrothermal liquefaction (HTL). The work is focused on the evaluation of temperature, reactor loading and time (factors) to maximize the yield of the pretreated biomass and the heteroatom contents transferred from the microalga biomass to the aqueous phase (responses). The study followed the factorial design and response surface methodology. An equation for every response has been obtained, which leads to the accurate calculation of the operating conditions required to obtain a given value of these responses. Temperature and time are critical factors with a negative effect on the pretreated biomass yield, but a positive one on the N and O recovery in the aqueous phase. The slurry concentration has to be low to increase heteroatom recovery and high to maximize the pretreated microalga yields

Subject Areas

Microalgae; hydrothermal liquefaction; pretreatment, low O and N biocrude

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