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1. (WO1997016508) PROCESS AND APPARATUS FOR FLUID CATALYTIC CRACKING OF HYDROCARBONS
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CLAIMS
1. In a process for the cracking of hydrocarbons comprising fractions boiling above about 600°F and further comprising at least 1 ppm by weight vanadium, by contacting said hydrocarbons with catalyst in a riser of a fluid catalytic cracking unit, the improvement comprising in combination adding to said hydrocarbons at a point before said contacting in said riser where said hydrocarbons are at temperature in a range of from about 90-430°C (200-800°F), an oil-soluble zirconium compound in an amount sufficient to provide in said riser a zirconium: vanadium weight ratio of about 0.1-10.

2. A process according to Claim 1 wherein said zirconium is added to said hydrocarbons in a feed line upstream from said riser and wherein said zirconium is injected into said hydrocarbons at a point approximately midstream in said feed line.

3. A process according to Claim 1 wherein said zirconium is injected into a hydrocarbon feed line upstream from said riser and through a quill which extends approximately to the center line of said feed line so that said zirconium compound contacts said hydrocarbons substantially near the center line of said feed line and is intimately mixed with said hydrocarbons by the turbulent flow conditions in said feed line.

4. A process according to Claim 1 wherein said catalyst comprises zeolite.

5. A process according to Claim 1 wherein said compound is comprises a compound selected from zirconium (IV) butoxide, zirconium

(IV) propoxide, zirconium lactate (ZrO[CH3CH(OH)COO]3, zirconium octoate or zirconium pentyloxide.

6. A process according to Claim 1 wherein said temperature is in the range of about 90-430°C (200-800°F).

7. A process according to Claim 1 wherein the weight ratio of Zr: V is from about 0.1 to 10.

8. A process according to Claim 1 wherein the weight ratio of Zr: V is from about 0.2 to 3.

9. A process according to Claim 1 wherein said zirconium compound comprises zirconium acetate.

10. In an FCC apparatus comprising a riser and having a feed line wherein hydrocarbon feedstocks are admitted to mix with catalyst in said riser, the improvement comprising: a) providing a source of hydrocarbons comprising
constituents boiling above about 600°F and communicating
with said feed line;

b) providing a quill extending to approximately the center
line of said feed line; and

c) providing a source of oil-soluble zirconium compound
communicating with said quill.

11. An apparatus according to Claim 10 additionally comprising feed proportioning means located between said source and said quill, for feeding said zirconium compound at a rate equivalent to a weight ratio of zirconium-to-vanadium on catalyst of from about 0.1 to 10.

12. All inventions substantially as described herein.

AMENDED CLAIMS
[received by the International Bureau on 27 February 1997 (27.02.97) ; original claims 1 ,2 and 10 amended; remaining claims unchanged (3 pages) ]

1 . In a process for the cracking of hydrocarbons comprising fractions boiling above about 316°C (600°F) and further comprising at least 1 ppm by weight vanadium, by contacting said hydrocarbons with catalyst in a riser of a fluid catalytic cracking unit and wherein hydrocarbon feed is heated in a feed heater upstream of said riser, the improvement comprising in combination adding to said hydrocarbons at a point downstream of said feed heater and before said contacting in said riser where said hydrocarbons are at temperature in a range of from about 90-430°C (200-800°F), an oil-soluble zirconium compound in an amount sufficient to provide in said riser a zirconium: vanadium weight ratio of about 0.1 -10.

2. A process according to Claim 1 wherein said hydrocarbon feed is heated in a feed heater upstream of said riser, and said zirconium is added to said hydrocarbons in a feed line upstream from said riser downstream of said feed heater, and wherein said zirconium is injected into said hydrocarbons at a point approximately midstream in said feed line.

3. A process according to Claim 1 wherein said zirconium is injected into a hydrocarbon feed line upstream from said riser and through a quill which extends approximately to the center line of said feed line so that said zirconium compound contacts said hydrocarbons substantially near the center line of said feed line and is intimately mixed with said hydrocarbons by the turbulent flow conditions in said feed line.

4. A process according to Claim 1 wherein said catalyst comprises zeolite.

5. A process according to Claim 1 wherein said compound is comprises a compound selected from zirconium (IV) butoxide, zirconium (IV) propoxide, zirconium lactate (ZrO[CH3CH(OH)COO]3, zirconium octoate or zirconium pentyloxide.

6. A process according to Claim 1 wherein said temperature is in the range of about 90-430°C (200-800°F).

7. A process according to Claim 1 wherein the weight ratio of Zr:V is from about 0.1 to 10.

8. A process according to Claim 1 wherein the weight ratio of Zr:V is from about 0.2 to 3.

9. A process according to Claim 1 wherein said zirconium compound comprises zirconium acetate.

10. In an FCC apparatus comprising a riser and having a feed line wherein hydrocarbon feedstocks are admitted to mix with catalyst in said riser, the improvement comprising.

a) providing a source of hydrocarbons comprising
constituents boiling above about 316°C (600°F) and
communicating with said feed line;

b) providing a quill extending to approximately the center
line of said feed line; and

c) providing a source of oil-soluble zirconium compound
communicating with said quill.

1 1. An apparatus according to Claim 10 additionally comprising feed proportioning means located between said source and said quill, for feeding said zirconium compound at a rate equivalent to a weight ratio of zirconium-to-vanadium on catalyst of from about 0.1 to 10.

12. All inventions substantially as described herein.