Effect of washing with diluted acids on Enteromorpha clathrata pyrolysis products: Towards enhanced bio-oil from seaweeds

Bin Cao, Shuang Wang, Yamin Hu, Abd El-Fatah Abomohra, Lili Qian, Zhixia He, Qian Wang, Benjamin Bernard Uzoejinwa and Sivakumar Esakkimuthu

Renewable Energy, 2019, vol. 138, issue C, 29-38

Abstract: Nowadays, macroalgae are widely discussed as advantageous alternative feedstock for crude bio-oil production using pyrolysis. In the present work, pyrolysis products of Enteromorpha clathrata washed with 7% phosphoric acid, hydrochloric acid and sulfuric acid were studied. In general, washing with diluted acids resulted in significant increase in the yields of bio-oil and non-condensable gas over the control in favor of the bio-char. In addition, HCl pretreatment enhanced the relative contents of aliphatic hydrocarbons in the bio-oil by 1.5 times over the control. Furthermore, HCl pretreatment showed 37% and 52.6% reduction in acids and oxygen-containing compounds, respectively, with respect to the control. FTIR analysis showed that acid-washing led to reduction in OH stretching vibration, confirming that it can disrupt hydroxyl bonds reducing phenols, carboxylic acids and water impurities in the bio-oil. In conclusion, washing of biomass using diluted acids could play a key role to enhance the bio-oil yield and significantly influence products characteristics; particularly, HCl enhanced bio-oil yield with higher aliphatic hydrocarbons proportion.

Keywords: Algae; Seaweeds; Enteromorpha clathrata; Bioenergy; Pyrolysis; Acid-washing (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:138:y:2019:i:c:p:29-38

DOI: 10.1016/j.renene.2019.01.084

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