METHOD FOR PROCESSING HYDROCARBON RAW FOR PREPARING HIGH-OCTANE PRODUCTS Russian patent published in 2006 - IPC C07C43/04 C07C41/06 

FIELD: petroleum chemistry, chemical technology.

SUBSTANCE: method involves processing hydrocarbon raw comprising as minimum tert.-pentenes and other C₅-hydrocarbons to yield one or some high-octane products comprising alkyl-tert.-pentyl ester wherein methyl or ethyl represents alkyl. Method involves liquid-phase chemical interaction of tert.-pentenes with methyl alcohol or ethyl alcohol in the presence of acid solid catalyst at 25-100°C for two steps and intermediate distillation of hydrocarbons. At the first step conversion of tert.-pentenes is 40-88% and at this step 80% of C₅-hydrocarbons, not less, is distilled off from the reaction mixture, among them the greater part of unreacted 2-methyl-butene-2 and, preferably, the greater part of alcohol and with removal of high-octane residue wherein the concentration of alkyl-tert.-pentyl ester exceeds as minimum the total concentration of C₅-hydrocarbons. At the second step in distillate obtained at the first step, possibly, with additional addition of alcohol and/or hydrocarbon raw comprising tert.-pentenes and/or hydrocarbon raw comprising isobutene method involves conversion of 40% tert.-pentenes feeding to the second step and high-octane flow is prepared wherein the total concentration of C₅-hydrocarbons exceeds the concentration of alkyl-tert.-pentyl ester. Invention provides simplifying technology of the process.

EFFECT: improved method of processing.

11 cl, 3 dwg, 1 tbl, 11 ex