GASOLINE FRACTION PRODUCTION PROCESS (OPTIONS) Russian patent published in 2005 - IPC

FIELD: petroleum processing.

SUBSTANCE: invention relates to rectification of petroleum feedstock and can be used in production of straight-run gasolines and gasoline components, e.g. iso- and normal pentanes. Process is implemented via separating feedstock into light, intermediate, and heavy fractions, one of which, after hydrofining and isomerization, is further rectified. Rectification column system comprises preliminary feedstock separation column and isomerizate separation column. Light fraction from preliminary column is recovered as commercial product and heavy fraction is sent to reforming. Intermediate fraction, which iC₅-70°, is subjected to hydrofining and isomerization and then fed into isomerizate separation column to be separated into light fraction ΣC₅, intermediate fraction, and heavy fraction ΣC₆, light and heavy fractions being then used, respectively, as upper and lower recycles in preliminary column and intermediate fraction is recovered as commercial product. In other embodiments of invention, iC₅ fraction from preliminary column is recovered as commercial product. In this case, recycle inlet points in preliminary column for light and heavy fractions are positioned, respectively, below and above outlet points for light and heavy fractions and, as upper and lower recycles of hexane column, respectively, ΣC₅ and ΣC₆ fractions are used. In addition, several heavy gasoline fractions are withdrawn from preliminary feedstock separation column through additional side outlets. In another embodiment of invention, iC₅-70° fraction is withdrawn as intermediate fraction from preliminary separation column, subjected to hydrofining and isomerization and then introduced into isomerizate separation column, while light fraction from the same column is routed as recycle to preliminary column and heavy fraction is recovered as commercial product. Intermediate fraction from preliminary separation column is iC₅-70° fraction, which is subjected to hydrofining and isomerization and then introduced into isomerizate separation column, while heavy fraction from the same column is routed as recycle to preliminary column and light fraction is recovered as commercial product.

EFFECT: increased rectification accuracy of gasoline fraction rectification and reduced energetic expenses.

11 cl, 3 dwg