Upgrading of reformates by catalyst compositions selective for cracking low and high boiling paraffin components

Claim 1

A METHOD FOR UPGRADING A NAPHTHA CHARGE COMPOSITION BOILING IN THE GASOLINE BOILING RANGE WHICH COMPRISES: REFORMING A NAPHTHA CHARGE WITH A PLATINUM REFORMING CATALYST MAINTAINED AT REFORMING CONDITIONS INCLUDING A TEMPERATURE ABOVE 800*F. AND A PRESSURE BELOW 700 PSIG TO PRODUCE AN AROMATIC ENRICHED PRODUCT EFFLUENT COMPRISING NORMAL AND BRANCHED HYDROCARBONS. PASSING AROMATIC ENRRICHED PRODUCT OF SAID REFROMING IN CONTACT WITH A ZSM-5 TYPE OF CRYSTALLINE ALUMINOSILICATE ZEOLITE CATALYST COMPOSITION PROVIDED WITH MAJOR AXIS ELLIPHATICAL PORE SIZE IN THE RANGE OF ABOUT 6 TO ABOUT 9 ANGSTROMS UNDER CONDITIONS FOR SELECTIVITY CRACKING SINGLY BRANCHED AND NORMAL HYDROCARBONS COMPRISING C7 AND HIGHER BOILING HYDROCARBONS, AND THEREAFTER SUBJECTING THE PRODUCT OF THE ABOVE SELECTIVE CRACKING TO CONTACT WITH A CRYSTALLINE ALUMINOSILICATE ZEOLITE HYDROCRACKING CATALYST OF THE ERIONITE TYPE PROVIDING AN AVERAGE PORE SIZE LESS THAN ABOUT 6 ANGSTROMS UNDER TEMPERATURE AND PRESSURE CONDITIONS SELECTED TO CRACK N-PARAFFINS BOILING BELOW C7 HYDROCARBONS WITHOUT SUBSTANTIALLY CRACKING OF MULTIBRANCHD HYDROCARBONS AND C7 TO C9 ALKYL AROMATICS IN THE AROMATIC ENRICHED PRODUCT.

Claim 2

A METHOD FOR UPGRADING A NAPHTHA CHARGE COMPOSITION BOILING IN THE GASOLINE BOILING RANGE WHICH COMPRISES: REFORMING A NAPHTHA CHARGE WITH A PLATINUM REFORMING CATALYST MAINTAINED AT REFORMING CONDITIONS INCLUDING A TEMPERATURE ABOVE 800*F. AND A PRESSURE BELOW 700 PSIG TO PRODUCE AN AROMATIC ENRICHED PRODUCT EFFLUENT COMPRISING NORMAL AND BRANCHED HYDROCARBONS. PASSING AROMATIC ENRRICHED PRODUCT OF SAID REFROMING IN CONTACT WITH A ZSM-5 TYPE OF CRYSTALLINE ALUMINOSILICATE ZEOLITE CATALYST COMPOSITION PROVIDED WITH MAJOR AXIS ELLIPHATICAL PORE SIZE IN THE RANGE OF ABOUT 6 TO ABOUT 9 ANGSTROMS UNDER CONDITIONS FOR SELECTIVITY CRACKING SINGLY BRANCHED AND NORMAL HYDROCARBONS COMPRISING C7 AND HIGHER BOILING HYDROCARBONS, AND THEREAFTER SUBJECTING THE PRODUCT OF THE ABOVE SELECTIVE CRACKING TO CONTACT WITH A CRYSTALLINE ALUMINOSILICATE ZEOLITE HYDROCRACKING CATALYST OF THE ERIONITE TYPE PROVIDING AN AVERAGE PORE SIZE LESS THAN ABOUT 6 ANGSTROMS UNDER TEMPERATURE AND PRESSURE CONDITIONS SELECTED TO CRACK N-PARAFFINS BOILING BELOW C7 HYDROCARBONS WITHOUT SUBSTANTIALLY CRACKING OF MULTIBRANCHD HYDROCARBONS AND C7 TO C9 ALKYL AROMATICS IN THE AROMATIC ENRICHED PRODUCT.

Claim 7

A method for upgrading a naphtha charge fraction comprising C5 and higher boiling hydrocarbons which comprises: reforming a naphtha charge in at least two sequentially arranged beds of platinum reforming catalyst under conditions to produce an aromatic rich reformate product comprising C5 and higher boiling normal and singly branched hydrocarbons, selectively cracking normal and singly branched hydrocarbons higher boiling than C6 hydrocarbons in said reformate product by contact with a cracking catalyst comprising a ZSM-5 type of crystalline zeolite, and thereafter selectively cracking C5 and C6 normal paraffins in the product of the ZSM-5 cracking operation with an erionite hydrocracking catalyst.

Claim 8

A method for upgrading a naphtha charge fraction comprising C5 and higher boiling hydrocarbons which comprises: reforming a naphtha charge in at least two sequentially arranged beds of platinum reforming catalyst under conditions to produce an aromatic rich reformate product comprising C5 and higher boiling normal and singly branched hydrocarbons, selectively cracking normal and singly branched hydrocarbons higher boiling than C6 hydrocarbons in said reformate product by contact with a cracking catalyst comprising a ZSM-5 type of crystalline zeolite, and thereafter selectively cracking C5 and C6 normal paraffins in the product of the ZSM-5 cracking operation with an erionite hydrocracking catalyst.

Claim 10

A method for upgrading a naphtha boiling in the gasoline boiling range which comprises: reforming a naphtha charge comprising paraffins and naphthenes over a platinum reforming catalyst under conditions to effect dehydrogenation of at least a major portion of the naphthenes in said naphtha charge, adjusting the product effluent of said reforming operation to a temperature in the range of 500* to 700*F. and passing the temperature adjusted effluent in contact with a ZSM-5 type crystalline zeolite catalyst under conditions of pressure and temperature to effect cracking of C6 and higher boiling normal and singly branched paraffins to produce a product enriched in branched and aromatic hydrocarbons, separating the product thus enriched to recover a hydrogen rich gaseous stream from a hydrocarbon stream comprising C5 and higher boiling hydrocarbons, and hydrocracking substantially only normal C5 hydrocarbons in the hydrocarbon stream comprising C5 and higher boiling hydrocarbons to lower boiling hydrocarbon components with an erionite crystalline zeolite catalyst provided with hydrogenation activity.

Claim 11

A method for upgrading a naphtha boiling in the gasoline boiling range which comprises: reforming a naphtha charge comprising paraffins and naphthenes over a platinum reforming catalyst under conditions to effect dehydrogenation of at least a major portion of the naphthenes in said naphtha charge, adjusting the product effluent of said reforming operation to a temperature in the range of 500* to 700*F. and passing the temperature adjusted effluent in contact with a ZSM-5 type crystalline zeolite catalyst under conditions of pressure and temperature to effect cracking of C6 and higher boiling normal and singly branched paraffins to produce a product enriched in branched and aromatic hydrocarbons, separating the product thus enriched to recover a hydrogen rich gaseous stream from a hydrocarbon stream comprising C5 and higher boiling hydrocarbons, and hydrocracking substantially only normal C5 hydrocarbons in the hydrocarbon stream comprising C5 and higher boiling hydrocarbons to lower boiling hydrocarbon components with an erionite crystalline zeolite catalyst provided with hydrogenation activity.