Agent for reducing acid value of used cooking oil and method for regenerating used cooking oil using same

An agent for reduction of the acid value of used cooking oil, the agent comprising a hydrotalcite-related compound as an effective component, wherein the agent has a deacidification capacity that reduces the acid value by 70% or more, and has a decoloration capacity that reduces yellowness due to deterioration by 15%,

• characterized in that the hydrotalcite-related compound is a silica-supported Mg—Al-based hydrotalcite-based compound in which silica is supported in the interlayer or on the surface of a Mg—Al-based hydrotalcite-based compound;
• the molar ratio (MgO/Al2O3) is 4 to 8;
• in X-ray diffraction, the peak for the (003) face of the silica-supported hydrotalcite-based compound is shifted toward the low-angle side relative to the peak for the (003) face of the Mg—Al-based hydrotalcite-based compound;
• the specific surface area according to the BET method is 150 m2/g or more;
• the total specific surface area according to the t-plot method is 200 m2/g or more;
• the pore specific surface area according to the t-plot method is 140 m2/g or more;
• and the pore specific surface area according to the t-plot method accounts for 70% or more of the total specific surface area.