Extraction, characterization and deoxy-liquefaction of crude polysaccharide from Enteromorpha prolifera to high-quality liquid oil

Co‐Production of Bio‐Ethanol and Bio‐Oil from Different Species of Macroalgae

“…The H/C and O/C ratios (1.86–1.88 and 0.037–0.046) were lower than those of original feedstock (2.16–2.52 and 1.47–2.04). The phenomenon may be due to the deoxy‐liquefaction technique which is regarded as an effective method for oxygen removal as reported previously [24] . The HHV for the oils were calculated to be 45.06, 44.53 and 45.12 MJ/kg, respectively.…”

“…Similar to the previous reports, [24,27] the major compounds could be divided into six categories on the basis of the functional groups: alkanes, alkenes, aromatic hydrocarbons, phenols, nitrogenous compounds as well as some oxygenous compounds including alcohols, esters and ketones. There were some differences in the kinds of compounds as well as their peak area which could be attributed to the component diversity among three algae residues after hydrolysis.…”

“…The appearance of broad band between 3600 and 3200 cm −1 implied the absorption peak for O−H stretching vibrations [23] . The peaks located in 3000–2800 cm −1 corresponded to C−H stretching vibrations, and those in 1200–1000 cm −1 were the C−O stretching vibrations from sugar ring and glycosidic bond [24] . In addition, the absorption peaks around 1640 cm −1 could be the COO − stretching vibrations.…”

“…The phenomenon may be due to the deoxy-liquefaction technique which is regarded as an effective method for oxygen removal as reported previously. [24] The HHV for the oils were calculated to be 45.06, 44.53 and 45.12 MJ/kg, respectively. This is close to our previously reported liquid oils from macroalgae by deoxyliquefaction [27] and much higher than those from macroalgae by pyrolysis or hydrothermal liquefaction listed in Table S2.…”

“…The peak area for aromatic hydrocarbons and phenols from EPR, UPR and GAR was 1.70 %, 2.38 %, 1.19 % and 14.12 %, 7.84 % and 13.69 %, respectively, which is lower than that obtained from macroalgae raw materials reported previously. [24,27] The monocyclic aromatics including benzene, toluene, and xylene etc. may come from amino acids decomposition in protein in macroalgae.…”