Oxidative desulfurization of catalytically cracked gasolines, produced from a blend of Baku crude oils, with hydrogen peroxide in a formic acid medium under phase transfer catalysis conditions using pyri dine and acetonitrile as ligands has been studied. It has been found that running the process under these con ditions on heterogeneous catalysts containing Mo and Co ions makes it possible to decrease the residual sul fur content in the gasolines from 200 to 33-40 ppm.
Distribution of sulfur compounds in catalytically cracked (CC) light (IBP-130°C) and heavy (130°-EP) gasoline fractions is studied, and separate hydrofining of these fractions on GKD-205 and S-12 catalysts is performed. Hydrofining of catalytically cracked light gasoline fractions is conducted at low temperature (70-100°C) and pressure (0.5-1 MPa) to minimize the drop in octane number (ON). Under these conditions, the degree of hydrogenolysis of the total and mercaptan sulfur comprises 72.7 and 93%, respectively, and the degree of hydrogenation of olefins is 9.2%. When equal proportions of light and heavily catalytically cracked gasoline fractions are blended, and the blend obtained is added to commercial gasoline in the amount of 45-50%, the total s u l f u r c o n t e n t i n t h e l a t t e r f a l l s f r o m 2 0 0 ( w i t h o u t h y d r o f i n i n g o f t h e C C g a s o l i n e ) to 30 ppm. The ON loss is no more than 0.5 point. Key words: catalytically cracked gasoline, total sulfur, selective hydrofining, degree of hydrogenolysis, octane number, olefins. T r a n s p o r t o p e r a t i n g o n h y d r o c a r b o n f u e l i s o n e o f t h e b a s i c s o u r c e s o f a t m o s p h e r i c pollution [1], particularly sulfur oxides. The primary source of sulfur compounds (up to 95%), in commercial gasoline is the catalytically cracked gasoline (CCG) fraction [2]. The method most widely employed to remove sulfur compounds from CCG is hydrofining during which the olefin-saturation process, which leads to a 2-4-unit reduction in octane number (ON), takes place. To reduce the drop in ON, selective hydrofining is carried out, separating the CCG into light and heavy fractions, which are subjected to hydrofining under different conditions [3]. Until recently, the light CCG fraction could not have been subjected to hydrodesulfurization. Only the heavy fraction containing thiophene sulfur and a large amount of olefins were subjected to hydrofining, 226 Indices Broad CCG fraction IBP -130C 130C -EP Density at 20 C, kg/m 3 747 688 750 Fractional composition, C IBP
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