초록 ▼

Disclosed is a method for treating naphtha. The method comprises providing naphtha feed, and the naphtha feed comprises naphthene ring-containing compounds. The naphtha feed is contacted with a ring opening catalyst containing a Group VIII metal under conditions effective to ring open the naphthene

Disclosed is a method for treating naphtha. The method comprises providing naphtha feed, and the naphtha feed comprises naphthene ring-containing compounds. The naphtha feed is contacted with a ring opening catalyst containing a Group VIII metal under conditions effective to ring open the naphthene rings to form a ring opened product. The ring open product can then be contacted with a catalytic cracking catalyst under effective cracking conditions to form an olefin product. The olefin product will be particularly high in ethylene and propylene content.

대표청구항 ▼

1. A method for converting a naphtha feed boiling in the range of about 0° C. to about 230° C. and containing naphthene ring-containing compounds, comprising: a) contacting the naphtha feed with a catalytically effective amount of a ring opening catalyst capable of opening a ring at a tertiary ca

1. A method for converting a naphtha feed boiling in the range of about 0° C. to about 230° C. and containing naphthene ring-containing compounds, comprising: a) contacting the naphtha feed with a catalytically effective amount of a ring opening catalyst capable of opening a ring at a tertiary carbon site under effective ring opening conditions to form a ring opened product wherein said ring opening catalyst contains at least one of Ru, Rh, Ir, and Pt on an inorganic refractory oxide support; and b) contacting said ring opened product with a catalytically effective amount of a cracking catalyst under effective conditions, including temperatures from about 400° C. to about 750° C., to form a product containing olefins. 2. The method of claim 1 wherein the supported naphthene ring opening catalyst further comprises at least one of an alkali or alkaline earth metal. 3. The method of claim 1 wherein Ir is present in an amount ranging from about 0.3 to about 2.0 wt. %, based on the total weight of the ring opening catalyst. 4. The method of claim 3 wherein the catalyst is a polymetallic catalyst wherein the Ir is combined with at least one of Pt, Ru, and Rh present in an amount ranging from about 0.001 to about 2.0 wt. %, based on the total weight of the ring opening catalyst. 5. The method of claim 4, wherein Ir is combined with Pt. 6. The method of claim 2 wherein the alkaline earth metal is barium. 7. The method of claim 1, wherein ring opening is carried out at a temperature of from about 150° C. to about 400° C. 8. The method of claim 1, wherein ring opening is carried out at a total pressure from about 0 to about 3,000 psig. 9. The method of claim 1, wherein ring opening is carried out at a liquid hourly space velocity of from about 0.1 to about 10 V/V/Hr. 10. The method of claim 1, wherein ring opening is carried out at a hydrogen treat gas rate of from about 500 to about 10,000 standard cubic feet per barrel. 11. The method of claim 1, wherein the naphtha feed's sulfur content is less than about 1 ppm. 12. The method of claim 1, wherein the cracking catalyst comprises a large or medium pore zeolite. 13. A method for producing an olefin product from a naphtha feed boiling in the range of about 0° C. to about 230° C. and containing naphthene ring-containing compounds, comprising: a) contacting the naphtha feed with a first catalytically effective amount of a ring opening catalyst capable of opening the naphthene ring-containing compounds at a tertiary carbon site at a temperature ranging from about 225° C. to about 350° C., a total pressure ranging from about 100 to about 800 psig, a liquid hourly space velocity ranging from about 0.5 to about 5 v/v/h, and a hydrogen treat gas rate ranging from about 500 to about 3000 scf/bbl, in order to form a ring opened product having at least 90 wt. % normal paraffin, based on the total weight of the product, the ring-opening catalyst containing i) at least one of Ir, Pt, Rh, and Ru on ii) an alumina support containing at least one of an alkali and alkaline-earth metal; b) contacting said ring opened product in a catalytic cracking zone with a catalyst containing ZSM-5 at a temperature ranging from about 500° C. to about 700° C., a pressure ranging from about 0 to about 45 psig, and at a catalyst-to-oil ratio in the cracking zone ranging from about 4:1 to about 9:1 in order to form a cracked product; c) separating from said cracked product a polymerization feed of at least one of ethylene and propylene. 14. The method of claim 13 further comprising polymerizing said polymerization feed in order to form a polymer.