The oils model of compatibility depends on (SBN) (IN)

ASTM D7112 analysis provides Solubility Blending Numberand Insolubility Number (IN) in addition to Po, Pa, and P-value (IN). When a fuel’s P-value is less than one, it is termed unstable. When a fuel’s P-value is lowerthan one, it is termed unstable. The greater the P-value, the less likely it is that asphaltenes will precipitate in the gasoline. The FRmax and Po are determined by analyzing according to ASTM D7060. The P-ratio is used to defined PoFRmax, and a fuel is considered stable when the Po is higher than FRmax, i.e. when Po/FRmax = P-ratio is greater than 1. The higher the P-ratio, the less the danger of asphaltenes precipitating from the fuel.
The oils model of compatibility depends on (SBN) (IN) as described below: The IN max is the factor of limit of the two fuels, linear variation of SBN. Through the average volumetric calculation of the SBNs of the individual fuels, SBNmix, the model takes into consideration the mixing ratio of the two fuels. SBNmix = % FuelA x SBN, fuel A + % FuelB x SBN, Fuel B. Recognizing the intricacy of asphaltene’s stability behavior, a certain degree of uncertainty is recognized by criteria of adding a “margin for error.” A 1.4 [2] factor is used in the following examples: The FRmax together with Po are calculated using ASTM D7060 analysis. The P-ratio is utilized to determine PoFRmax, and a fuel is deemed stable when Po exceeds FRmax, i.e. when Po/FRmax = P-ratio is larger than 1. The less the risk of asphaltenes crystallizationfrom the fuel, the greater the P-ratio.

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