In this study gasoline samples were collected from Khartoum refinery from Fluid Catalytic Cracking unit (FCC), the Reformate Gasoline unit (RFG) and finished product. The Oxygenated were prepared from the finished gasoline plus the ethanol in a different blend ratios, such as 5 % of ethanol (E5), 7.8 % of ethanol (E7.8), and 10 % of ethanol (E10). The analysis carried out on the gasoline samples and the blends. The analysis done in this study is the main properties of gasoline that have direct impact on the environment, etc. Gas chromatography was used to analyze the olefins and aromatics hydrocarbon groups and benzene component. Octane number, Reid Vapor Pressure (RVP) and sulphur content were measured, etc. The result shows the aromatics content of the Sudanese gasoline produced from Khartoum refinery was of a good quality worldwide, especially when it compared with the British, the World Wide Fuel Charter (WWFC), the Emirate, and the Indian standard specifications. Which is a better environmental outcome will be achieve. Also the current Sudanese gasoline has an intermediate value of benzene, olefins and sulphur contents when it compared with the British and the WWFC specifications as a high standard, and the Emirate and the Indian specifications as a low standard. On the present study the octane number of the current Sudanese gasoline produced at the Khartoum refinery is found to be low when it is compared with the WWFC and the British standard specifications, also the existing gum of the Sudanese gasoline is within the international specification. The result present of study shows that the adding of the ethanol to the gasoline obtained a greatest improvement in octane number, e.g. the use of 10% ethanol will increase the octane number to 3.6 points. Also there are noticeably decreasing in aromatics, benzene and sulphur contents, and there is a major reduction of olefins substantially with the ethanol volume, which is to somewhat a better environmental outcome will be achieve. The RVP of the blends E5, E7.8 & E10, are within the range of the RVP of the Sudanese standard specifications.
