关键词: 餐厨废油, 生物柴油, 化工产品

Abstract: Considering the duality (waste and resource) of used cooking oil (UCO)，studies on utilization technologies of used cooking oil can effectively address many social issues，such as food safety，waste oil pollution，etc. The different chemical compositions and recovery status of UCO are presented，and various added value chemicals like first- and second-generation biodiesel，surfactants，detergents，fatty acids，synthesis gas，and other chemical products from used cooking oil are also summarized. Due to the complicated compositions of UCO provided，the industrialization of chemicals preparation from UCO is limited by harsh process condition and small-scale production，while the biodiesel from UCO shows significant advantages. The fuel properties of first- and second-generation biodiesel fuel from used cooking oil are also reviewed and compared with each other. The first-generation biodiesel has a low cetane number and oxidation stability，while the second-generation biodiesel fuels prepared by advanced technological methods like hydrocracking，catalytic cracking，and polarizing the carboxyl group of fatty acid salt with microwave radiation have better quality and economic advantage. After reviewing some major UCO processes and their advantages/disadvantages，the development prospect of UCO is discussed.

Key words: used cooking oil, biodiesel, chemicals