Production of aviation or motor fuels

Claim 1

A PROCESS FOR THE PRODUCTION OF BLENDING CONSTITUENTS OF AN AVIATION OR MOTOR FUEL OF HIGH OCTANE NUMER FROM A SUBSTANTIALLY SULPHUR-FREE CRACKED PETROLEUM DISTILLATE CONTAINING MONO-OLEFINES AND DIOLEFINES COMPRISING THE STEPS OF HYDROGENATING THE FEEDSTOCK FOR THE CONVERSION OF THE MONO-OLEFINE AND DIOLEFINE CONTENT INTO CORRESPONDING PARAFFIN AND NAPHTHENE HYDROCARBONS BY SIMPLE ADDITION OF HYDROGEN; SUBJECTING THE LIGHTER PORTION OF THE HYDROGENATED PRODUCT BOILING UP TO ABOUT 100*C TO FRACTIONATION FOR THE SEPARATION THEREFROM OF AT LEAST ONE NORMAL FRACTION, NAMELY NORMAL HEPTANE TOGETHER WITH THE CONTENT OF SAID LIGHTER PORTION BOILING BEYOND ABOUT 92*C AND FOR THE RECOVERY FROM SAID LIGHTER PORTION OF AT LEAST ONE FRACTION OF HIGH OCTANE NUMBER, NAMELY A FRACTION HAVING AN APPROXIMATELY BOILING RANGE OF ABOUT 72*C TO ABOUT 92*C COMPRISING THE CONTENT OF CYCLIC HYDROCARBONS AND BRANCHED CHAIN HYDROCARBONS BOILING IN THAT RANGE TO THE EXCLUSION OF ANY SUBSTANTIAL PROPORTION OF 2METHYL HEXANE, 3-METHYL HEXANE, 3-ETHYL PENTANE AND NORMAL HEPTANE, THE FRACTIONATION BEING CARRIED OUT UNDER CONDITIONS OF PRECISION IN THE MAINTENANCE OF DETERMINED TOP AND BOTTOM TEMPERATURES AND PRESSURE, IN TEH USE OF COLUMNS HAVING HE EQUIVALENT OF A MODERATELY LARGE NUMBER OF THEORETICAL PLATES NOT SUBSTANTIALLY LESS THAN 50 THEORETICAL PLATES, AND A HIGH REFLUX RATIO, IN GENERALY NOT SUBSTANTIALLY LESS THAN 15:1.