Split feed reforming and n-paraffin elimination from low boiling reformate

Claim 1

The method of claim 1 wherein the ratio of aromatic to paraffin in the charge to the crystalline aluminosilicate catalyst contact step is adjusted to assure an excess of paraffin.

Claim 12

A method for upgrading naphtha boiling range hydrocarbons to gasoline product of improved octane rating which comprises, separating said naphtha boiling hydrocarbons into a light naphtha charge and a heavier naphtha charge, separately reforming the light and heavy naphtha charges, separating a hydrogen rich gas stream from the reformate product of each of said naphtha reforming steps, recycling separated hydrogen rich gas to the reforming step from which obtained, further separating said reformate product of said heavy naphtha reforming step into a light reformate fraction and a heavier reformate fraction, combining the thus separated light reformate fraction with the reformate product of said light naphtha charge separated from hydrogen rich gas, passing the combined light reformate material obtained as above defined in contact with a ZSM-5 type crystalline aluminosilicate catalyst having the property for restructuring paraffins by cracking, by isomerizing paraffins, by alkylating cracked paraffin constituents with aromatics present in the charge and recovering a gasoline boiling material from said crystalline aluminosilicate contact step reduced in n-paraffin components but of improved octane rating.

Claim 16

A method for upgrading a naphtha hydrocarbon feed fraction boiling in the range of C5 hydrocarbons up to about 400* F. to useful products including gasoline which comprises a. separating the naphtha feed fraction to recover a light naphtha boiling in the range of C6 hydrocarbons through substantially C7 type hydrocarbons from a higher boiling naphtha fraction, b. separately reforming said light naphtha fraction and said higher boiling naphtha fraction to reformate product fractions, c. separately recovering hydrogen rich gases from each of said reformate product fractions for recycle to the reforming step from which it is derived, d. further separating the reforming product of said higher boiling naphtha fraction into a light reformate material and a heavier reformate product, e. combining the thus obtained light reformate material with the reformate product of said light naphtha fraction separated from hydrogen rich gases and passing the combined light reformate material in contact with a crystalline zeolite conversion catalyst of the ZSM-5 type having activity and selectivity for converting particularly paraffin components to products within the group comprising gaseous olefins, LPG gaseous products and alkyl aromatics.