Upgrading Sewage Sludge Liquefaction Bio-Oil by Microemulsification: The Effect of Ethanol as Polar Phase on Solubilization Performance and Fuel Properties

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• 作者：Xiaowei Ding ; Xingzhong YuanLijian Leng ; Huajun Huang ; Hou Wang ; Jianguang Shao ; Longbo Jiang ; Xiaohong Chen ; Guangming Zeng
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1574-1582
• 全文大小：507K
• ISSN：1520-5029

文摘

Sewage sludge liquefaction bio-oil is capturing extensive attention for its sustainability and easy availability. However, some limitations of bio-oil such as high viscosity and poor cold flow properties hamper its direct application in engines. Two microemulsions including ethanol-in-diesel (M1) and diesel microemulsion (M2) were produced to upgrade bio-oil. Adding ethanol in M1 facilitated bio-oil solubilization and improved fuel properties of bio-oil. Because of low viscosity and low pour point of ethanol, M1 with ethanol as polar phase produced a more promising biofuel with acceptable viscosity and better cold flow properties compared with M2. Through microemulsification in diesel, hydrophilic and hydrophobic bio-oil components may penetrate into the polar core and the continuous phase, respectively, while amphiphilic components mainly located at the interface. The hydrogen bonding between ethanol and hydrophilic bio-oil components could enhance solubility and improve stability. Besides, polar phase ethanol could also act as a solvent to dissolve more less-hydrophilic bio-oil components into the polar core.