Study on compatibility of binary mixture systems between lard oil and three kinds of plant oil

Oil compatibility is the important factor which influence the quality and stability of mixed oil.The study about unsaturation and compatibility of binary mixture system ( LO and RO/SBO/CNO) was researched by the detection of iodine value and the map of solid fat content isotherm curve ( SFC-T) or the deviation curve ( Δ SFC-T) .At the same time, the basic physical and chemical properties of lard oil ( LO) , rapeseed oil ( RO) , soybean oil ( SBO) and coconut oil ( CNO) were analyzed.The results showed that the unsaturation of oil which mixed with LO and RO/SBO/CNO was increased with the mass fraction of RO/SBO and showed positive correlation, while CNO was the opposite. The mixed oil present mild eutectic phenomenon appeared in 5/10 ℃ and monotectic phenomenon in 15 ~ 50 ℃. RO and SBO had better compatibility with LO, CNO was the worst.The best mix proportion were 1∶ 9 ( RO∶ LO) , 1∶ 9/2∶ 8 ( SBO∶ LO) and 1∶ 9 ( CNO∶ LO) , and all the value of Δ SFC were in the range of-1.5% ~2%.