Production of aviation gasoline

Claim 1

IN THE PRODUCTION OF AVIATION GASOLINE FROM THE PRIMARY HYDROCARBON PRODUCTS OF A FISCHERTROPSCH SYNTHESIS PROCESS THE STEPS COMPRISING SEPARATING THE HYDROCARBONS FROM C5 UP TO ABOUT 360* F. END POINT INTO A C5-180* F. FRACTION AND A 180*-350* F. FRACTION; SUBJECTING THE C5-180* F. FRACTION IN THE PRESENCE OF A NORMALLY GASEOUS HYDROGEN-RICH FRACTION OBTAINED AS DEFINED HEREINBELOW TO HYDROGENATING CONDITIONS OF REACTION SUCH THAT SUBSTANTIALLY ALL OF THE OLEFINIC HYDROCARBONS ARE CONVERTED TO PARAFFINIC HYDROCARBONS; SEPARATELY RECOVERING FROM SAID HYDROGENATION A LIGHT HYDROGENATE BOILING BETWEEN ABOUT 100* AND ABOUT 300* F. AND CONTAINING A MIXTURE OF NORMAL AND ISOPARAFFINS; CATALYTICALLY ISOMERIZING SAID LIGHT HYDROGENATE UNDER CONDITIONS TO EFFECT SUBSTANTIAL CONVERSION OF THE NORMAL PARAFFINS TO ISOPARAFFINS; SEPARATELY RECOVERING FROM SAID ISOMERIZATION A HIGHLY ISOPARAFFINIC AVIATION GASOLINE BLENDING STOCK; SUBJECTING SAID 180*-350* F. FRACTION TO HYDROFORMING CONDITIONS OF REACTION SUCH THAT SUBSTANTIAL CYCLIZATION OF THE HYDROCARBONS OCCURS AND A NORMALLY GASEOUS HYDROGEN-RICH FRACTION IN AN AMOUNT SUFFICIENT TO OFFSET THE HYDROGEN CONSUMED IN THE HYDROGENATION OF THE AFORESAID C5-180* F. FRACTION IS PRODUCED; SEPARATELY RECOVERING FROM SAID HYDROFORMING A HIGHLY AROMATIC AVIATION GASOLINE BASE STOCK AND SAID NORMALLY GASEOUS HYDROGEN-RICH FRACTION; AND COMBINING THE AVIATION GASOLINE BLENDING STOCK WITH THE AVIATION GASOLINE BASE STOCK.