FIELD: chemistry.
SUBSTANCE: invention relates to a method of gasoline treatment including contact of gasoline source material with a mixed catalyst and its desulphurization and aromatization under hydrogen resulting in the desulphurization and aromatization product; wherein the mixed catalyst contains an adsorptive desulphurization catalyst and an aromatization catalyst, the percentage of the aromatization catalyst in relation to the mixed catalyst is within the period between 1 and 30% wt. The adsorptive desulphurization catalyst contains silicon dioxide, aluminum dioxide, zinc dioxide and a metal active in desulphurization which is selected from a group including cobalt, nickel, copper, iron, magnesium, molybdenum, tungsten, silver, tin and vanadium. The aromatization catalyst contains, calculated on a dry matter basis, between 10 and 30% wt. of molecular sieve, between 0 and 20% wt. of metal oxide active in aromatization and between 50 and 90% wt. of carrier calculated on the total mass of the aromatization catalyst, wherein the molecular sieve is comprised of a Y-structure molecular sieve and/or an MFI-structure molecular sieve, the metal active in aromatization constitutes at least one metal selected from the group including metal elements of group IVB, metal elements of group VB, metal elements of group VIB, metal elements of group VIII, metal elements of group IB, metal elements of group IIB and metal elements of group IIIA, and the carrier is comprised of silicon dioxide and/or aluminum oxide wherein no less than 50% wt. of the aromatization catalyst was put through passivation and/or aging so that the aromatization catalyst has the micro activity within the interval between 20 and 55. Passivation of the catalyst includes the stage of contact between the aromatization catalyst and a compound containing carbon, sulphur and/or nitrogen to conduct the reaction of passivation prior to desulphurization and aromatization, and aging includes the stage of processing of aromatization catalyst prior to desulphurization and aromatization under the following conditions: temperature within the interval between 500 and 800 °C, aging time within the interval between 1 and 360 hours and aging atmosphere containing steam.
EFFECT: technical result is reduced percentage of sulphur and olefin in gasoline and simultaneous increase of the octane number of gasoline while maintaining high yield of gasoline.
14 cl, 15 ex, 6 tbl, 1 dwg
