METHOD OF REMOVING O-XYLENE CONCENTRATE, BENZENE, TOLUENE, AND HIGH-OCTANE GASOLINE COMPONENT WITH IMPROVED ENVIRONMENTAL CHARACTERISTICS FROM GASOLINE AND BENZENE-TOLUENE REFORMING CATALYSATE Russian patent published in 2005 - IPC

FIELD: petrochemical processes.

SUBSTANCE: invention relates to chemical processing of petroleum products, notably to the process of producing o-xylene concentrate, high-octane gasoline component with improved environmental characteristics, commercial benzene and toluene from petroleum and gas-condensate feedstock. According to invention, gasoline reforming catalysate is subjected to fractionation on two rectification columns. Top product of the first column is benzene-toluene fraction with output ensuring potential production of sum of ethylbenzene and m- and p-xylenes in the top product equal to 10-45%. Side product is toluene-xylene fraction with output ensuring potential production of toluene in the side product equal to 5-30%. Bottom residue is fraction of aromatic hydrocarbons C₉ and higher. Side product bleeding point in the column is selected such that temperature difference between column bottom and this point were within a range of 30-70°C. Benzene-toluene fraction from the first column top is fed into the second rectification column operated under excess pressure 2-5 kg/cm². Top product of the second column is pre-benzene fraction with output ensuring potential production of non-aromatic C₃-C₆-hydrocarbons in the top product equal to 65-95%. Side product is benzene concentrate with output ensuring potential production of non-aromatic C₇-C₈-hydrocarbons in the side product equal to 30-65%. Bottom residue is toluene-xylene fraction. Side product bleeding point is selected such that temperature difference between side bleeding and column top were within a range of 35-75°C. Bottom product of the first column is combined with distillate and bottom residue of the second column thus producing high-octane gasoline component with improved environmental characteristics. Side distillates of the two columns are combined with benzene-toluene reforming catalysate and thus obtained product is consecutively subjected to hydrogenation, extraction with solvent refining agent to form extract, wherefrom commercial benzene, toluene, and o-xylene concentrate are recovered.

EFFECT: enlarged assortment of products, increased production of commercial benzene and toluene meeting State Standard requirements and also high-octane gasoline component with improved environmental characteristics.

2 cl, 15 ex