Patent Document ID: 20150090631
Application ID: 14395417
Patent Flag: 0

Claim One:
1. A method of preparing a hydrocarbon blend by blending at least two hydrocarbon oils, comprising: determining a stability factor of each of the at least two hydrocarbon oils; and blending the at least two hydrocarbon oils so as to satisfy Mathematical Formula 1 below based on the determined stability factor: ∑ i = 1 n a i A i > 0 [ Mathematical Formula 1 ] wherein a i is a stability factor of a hydrocarbon oil (i) in the blend, A i is wt % of the hydrocarbon oil (i) in the blend, and n indicates a number of hydrocarbon oils in the blend and is an integer of 2 or more, (a) when a SPOT value of a hydrocarbon oil according to ASTM D 4740-02 is less than 2, the stability factor is determined by Mathematical Formula 2 below: 
 Stability Factor( a i )=1× B i −1 [Mathematical Formula 2] wherein B i is a minimum amount of the hydrocarbon oil (i) to be blended with 100 g of a reference sample having SPOT 5 so as to exhibit SPOT 1, and (b) when a SPOT value of a hydrocarbon oil according to ASTM D 4740-02 is 2 or more, the stability factor is determined by Mathematical Formula 4 below: 
 Stability Factor( a i )=−(0.025× T i ×0.01)  [Mathematical Formula 4] wherein T i is a minimum amount of toluene to be blended with 100 g of the hydrocarbon oil (i) so as to exhibit SPOT 1.