Abstract: Mercaptan removal is an important part of liquefied petroleum gas (LPG) refining process, and a relatively perfect theoretical system has been formed for its proprietary technology. The four research directions of mercaptan removal for LPG are introduced from the aspects of mercaptan removal system, caustic catalytic oxidation regeneration system, tail gas treatment methods and technologies and waste caustic treatment, the research achievements of mercaptan removal for LPG are introduced from the aspects of material structure，physical properties, chemical reaction characteristics, process principle, technological process and patent technology and methods, and the direction and ideas of its future development are discussed.

Key words: liquefied petroleum gas/LPG, mercaptan, catalytic oxidation regeneration, tail gas treatment, waste caustic treatment