METHOD FOR PREPARING HIGH-OCTANE PRODUCT Russian patent published in 2005 - IPC

FIELD: petroleum chemistry, chemical technology.

SUBSTANCE: method for preparing high-octane product comprising ethyl-tert.-alkyl ester(s) from hydrocarbon raw containing tert.-C₄- and/or -C₅-alkenes and ethanol involves zone of heteroazeotropic rectifying drying ethanol, reaction zone(s) of chemical interaction of dried alcohol with tert.-alkene(s) in the presence of solid strong-acid catalyst and possible zone(s) of distillation off of unreacted hydrocarbons from the reaction mixture containing ethyl-tert.-alkyl ester(s). Alkane(s) and/or alkene(s) with boiling point from 27°C to 75°C are used as selective heteroazeotropic agent(s) or as components of these agents. Vapor flow containing mainly indicated hydrocarbon(s) and water are added above zone of heteroazeotropic drying and after its condensation and separating into layers hydrocarbon layer is recovered to the zone of heteroazeotropic drying, and aqueous layer practically no containing a heteroazeotropic agent is removed. From bottom zone of heteroazeotropic drying the flow containing dried ethanol as minimum is removed that is fed to zone(s) of indicated chemical interaction with tert.-alkenes.

EFFECT: improved preparing method.

8 cl, 3 tbl, 1 dwg, 5 ex