Hydrolysis of triacylglycerol(TAG) from fats and oils to glycerol and free fatty acid (FFA), also referred to as fat splitting, is an important reaction for the olechemical industry. Typically, hydrolysis is carried out at 100-260℃ and 100-7000 kPa using 0.4-0.15(w/w) initial water to oil ratio with or without catalysts. It is an endothermic reaction occurs in a stepwise manner where TAG is initially hydrolyzed to diacyglycerol (DAG) then to monoacylglycerol(MAG) and finally to glycerol. Water, in its subcritical state, can be used as both a solvent and reactant for the hydrolysis of triglycerides. subcritical water (150℃<T<370℃,0.4<p<22Mpa) can act as an acid or base catalyst. To investigate milder reaction conditions, in this study, waste cooking oil and fresh soybean oils will be hydrolyzed to free fatty acids with deionized water under SC CO2 medium in a batch reactor. Effects of the reaction temperature, time and solvent to feed ratio on FFA in the hydroysis at equilibrium will also observed for optimum conversion of oil. The reaction products will be analyzed by acid-base titration, GC FID and HPLC.

• Taeha Kim(Department of New Energy･Resource Engineering, Sangji Universiy)
• Younghwan Chu(Department of New Energy･Resource Engineering, Sangji Universiy)
• Md. Sufi Ullah Siddik Bhuyan(Department of Environmental Engineering, Sangji University)
• Kwan Ju Lee(Department of Environmental Engineering, Sangji University)
• Myung chul shin(Department of Environmental Engineering, Sangji University)
• Sungha Hong(Department of Environmental Engineering, Sangji University)
• Yongchan Seo(Department of Environmental Engineering, Sangji University)