Process for upgrading of straight run gasolines by a combination of catalytic reforming and isomerization

Claim 1

IN A PROCESS FOR UPGRADING OF STRAIGHT RUN GASOLINE BY CATALYTIC REFROMING AND CATALYTIC ISOMERIZATION, THE COMBINATION OF STEPS COMPRISING FRACTIONATING STRAIGH RUN GASOLINE INTO A FRIST STRAIGHT RUN FRACTION HAVING AN INITIAL BOILING POINT BETWEEN 95-150* F. AND A FINAL BOILING POINT BETWEEN 160-175* F., AND A SECOND STRAIGHT RUN FRACTION HAVING AN INITIAL BOILING POINT BETWEEN 160-175* F. AND A FINAL BOILING POINT BETWEEN 210-240* F., CATALYTICALLY REFORMING SAID SECOND STRAIGHT RUN FRACTION AT A TEMPERATURE BBETWEEN 850 AND 1000* F. IN THE PRESENCE OF ADDED HYDROGEN AND A DEHYDROGENATION CATALYST, FRACTIONATING THE PRODUCT OF SAID REFORMING INTO A FIRST REFORMED FRACTION BOILING BELOW ABOUT 185-225* F. AND SECOND REFORMED FRACTION BOILING ABOVE 185-225* F., EXTRACTING SAID FIRST REFORMED FRACTION ALONG WITH A HIGHER BOILING ISOMERIZATE FRACTION TO BE DESCRIBED UNDER CONDITIONS TO PRODUCE A PARAFFNIC RAFFINATE AND AN AROMATIC EXTRACT, COMBINING AT LEAST A PART OF SAID PARAFFINIC RAFFINATE WITH SAID FIRST STRAIGHT RUN FRACTIONA AND ISOMERIZING THE MIXTURE IN THE PRESENCE OF HYDROGEN AT A TEMPERATURE BETWEEN ABOUT 650 AND 850* F. WITH A NOBLE METAL ISOMERIZATION CATALYST, FRACTIONING THE RESULTING ISOMERIZATE INTO A LOWER BOILING ISOMERIZATE FRACTION BOILING UP TO ABOUT 135-145* F. AND A HIGHER BOILING ISOMERIZATE FRACTION BOILING ABOVE ABOUT 135-145* F. AND COMBINING SAID HIGHER BOILING ISOMERIZATE FRACTION WITH SAID FIRST REFORMED FRACTION AS AFORESAID.