https://orcid.org/0000-0002-4777-0681
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ABSTRACT
This study focuses on the ultrasonic pretreatment of bio-oil produced from the hydrothermal liquefaction (HTL) of microalgae. Ultrasonic pretreatment would increase the viscosity of the bio-oil. Time was the most influential factor affecting the viscosity of the bio-oil and increasing the time significantly increased the viscosity of the bio-oil. Ultrasonic pretreatment could increase the H/C molar ratio of the bio-oil. Ultrasonic frequency has little effect on the properties of the bio-oil. Basically, the pretreated bio-oil produced at a higher temperature, longer reaction time, higher frequency, and higher power contained lower N. However, contrary results were observed for the O content.
Funding
The authors gratefully acknowledge the financial support provided by the Program for New Century Excellent Talents in University (NCET-13-775) and the Fundamental Research Funds for the Universities of Henan Province (NSFRF140205).