Blends boiling range

Extractive distillation, using similar solvents to those used in extraction, may be employed to recover aromatics from reformates which have been prefractionated to a narrow boiling range. Extractive distillation is also used to recover a mixed ben2ene—toluene stream from which high quaUty benzene can be produced by postfractionation in this case, the toluene product is less pure, but is stiU acceptable as a feedstock for dealkylation or gasoline blending. Extractive distillation processes for aromatics recovery include those Hsted in Table 4. 

Heavy straight run gasoline Contains compounds with a boiling range from approximately 180°F to 380°F (82.2°C to 193.3°C) this fraction is typically blended directly into gasoline or used as reformer feedstock. 

Table II. Boiling Range of Typical Petroleum (Arabian Lift Blend), Coal Syncrude, and Shale Oil...

In this program, two types of fuel oil blends were combusted. One type of blend was derived only from primary liquefaction products, VGO and solvent, having a nominal boiling range of 350 to 1000°F and are referred to as 350-1000°F blends. Fuel oils were also blended by adding coker liquids, containing 1000°F+ material, to the 350-1000°F blends and are referred to as 350°F+ blends. 

Though FAME has limited oxidation stability, they remain a valid alternative for diesel. Conventional diesel fuel has a boiling range of 180-340 °C, with a composition of n-alkanes, cycloalkanes, alkyl benzenes, and polyaromatic compounds. Fossil diesels have a CN in the range 40-100. FAME has properties that are close to all these basic diesel properties. FAME can also easily blend with fossil diesel at any level due to their similar solvent behavior the viscosity of fossil diesel and biodiesel are also in the same range. 

The next cut gasoline stream from the crude distillation column is the naphtha cut. This stream has a boiling range of 200-365°F and contains a significant portion of naphthenes, aromatics, and paraffins. Thus, the naphtha cut is hydrotreated and reformed to upgrade this stream into a gasoline blending stock.9... 

This process involves reaction of dodecene with benzene in the presence of aluminum chloride catalyst fractionation of the resulting crude mixture to recover the desired boiling range of dodecylbenzene sulfonation of the dodecylbenzene and subsequent neutralization of the sulfonic acid with caustic soda blending the resulting slurry with chemical builders and drying. 

Condensate, or natural gasoline, is directly linked in value to that of crude oil. In many parts of the world it sells at a discount to the local marker crude oils because its boiling range profile does not easily fit into normal refinery operations - it contains too much light boiling fractions relative to typical crude oils. The discount is typically about l/bbl but for a given condensate there is considerable variability in the differential. If the octane is sufficient it may be used as a gasoline blend stock and this may make it more attractive than crude oil in some circumstances. 

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