METHOD FOR COMPREHENSIVE TREATMENT OF REFINERY HYDROCARBON GAS Russian patent published in 2013 - IPC C07C2/04 C07C2/56 C07C5/00 C07C9/02 C07C11/04 C10L1/06 C10G9/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for comprehensive treatment of hydrocarbon gases for one or more oil refineries wherein the starting gases used are mixtures of same-type refinery gases from different processing equipment, which are an ethane-containing hydrocarbon fraction, a hydrocarbon fraction with high content of hydrogen and a reflux fraction, taken for further treatment at the next steps: compressing the starting gases, removal of hydrogen sulphide and carbon dioxide from said gases, subsequent splitting of the reflux fraction into a deethanisation gas, a light ethane-containing hydrocarbon fraction, a propane-propylene fraction, a butane-butylene fraction and a fraction of C₅ or higher hydrocarbons, obtaining hydrogen using a hydrocarbon fraction with high content of hydrogen, compressing, drying, removing O₂, As, Hg, NO_x and other impurities, which are toxic for catalysts and equipment, from the ethane-containing fraction and splitting said fraction into a deethanised gas, an ethane fraction and a fraction of C₃ or higher hydrocarbons, chemical conversion of the ethane fraction to obtain pyrolysis products in a pyrolysis furnace, splitting pyrolysis products with separation of ethylene and using the propane-propylene and butane-butylene fractions to obtain high-octane motor petrol components by alkylation and/or oligomerisation, petrochemical synthesis products, and obtaining a liquefied propane-butane mixture as fuel for car engines.

EFFECT: high quality of end products.

16 cl, 1 dwg, 4 ex