Process for making anode grade coke

• US 4,795,548 A
• Filed: 10/27/1986
• Issued: 01/03/1989
• Est. Priority Date: 10/27/1986
• Status: Expired due to Fees

• Current Assignee: Intevep, S.A. (PDVSA Gas SA)
• Original Assignee: Intevep, S.A. (PDVSA Gas SA)
• Inventors: Rodriguez, Joaquin, Hidalgo, Rafael O., Velasco R, Leon E., Garcia, Wolfgang
• Primary Examiner(s): CALDAROLA, GLENN A
• Application Number:
  US06/923,190
• Time in Patent Office: 799 Days
• Field of Search: 208/127, 208/131, 208/50, 208/53
• US Class Current: 208/131
• CPC Class Codes: C10B 55/00 Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material cracking oils C10G
• CPC Class Codes: C10B 55/10 according to the "fluidised bed" technique

Abstract

A process for the production of anode grade coke from a hydrocarbon feed characterized by high levels of sulfur and metals comprises subjecting a vacuum resid to a fluidized bed coking process so as to produce gas, distillates, coke and a residual bottom stream, filtering the residual stream so as to remove solids and thereafter coking the filtered stream.

Claims

1. A process for the production of anode grade coke from a hydrocarbon feed characterized by high levels of sulfur and metals comprising:

(a) providing a vacuum resid characterized by the following composition and properties;

space="preserve" listing-type="tabular">______________________________________ Gravity, °

API -1.0 to 10.0 Conradson Carbon, wt. % 10.0 to 30.0 Sulfur, wt. % 1.0 to 5.0 Nitrogen, wt. % 0.1 to 1.5 Vanadium, ppm 75 to 1000 Nickel, ppm 30 to 250 ______________________________________

(b) subjecting said vacuum resid to a fluidized bed coking process under the following conditions;

space="preserve" listing-type="tabular">______________________________________ Reactor Bed Temperature, °

F. 950 to 1000 Reactor overhead temperature, °

F. 700 to 800 Reactor Dense Bed Pressure, psig 16 to 20 Reactor Diluted Bed Pressure, psig 12 to 16 ______________________________________

so as to produce gas, distillates, coke and a residual bottom stream characterized by the following composition and properties;

space="preserve" listing-type="tabular">______________________________________ Gravity, °

API -1.0 to 8.0 Conradson Carbon, wt. % 10.0 to 25.0 Sulfur, wt. % 1.0 to 5.0 Nitrogen, wt. % 0.1 to 1.5 Vanadium, ppm 50 to 500 Nickel, ppm 20 to 80 Aromatics, wt. % 40 to 80 Asphaltenes, wt. % 3.0 to 12.0 Solids, wt. % 0.5 to 3.0 Cut Point, °

F.+ 800 to 1000 ______________________________________

(c) filtering said residual stream so as to remove undesirable solids of high metal content and produce a filtered clean stream characterized by the following composition and properties;

space="preserve" listing-type="tabular">______________________________________ Gravity, °

API -1.0 to 8.0 Conradson Carbon, wt. % 10 to 25 Sulfur, wt. % 1 to 5 Nitrogen, wt. % 0.1 to 1.5 Vanadium, ppm 5 to 200 Nickel, ppm 2 to 50 Aromatics, wt. % 40 to 80 Asphaltenes, wt. % 2.0 to 10.0 Solids, wt. % 0 to 0.5 Cut Point, °

F.+ 800 to 1000 ______________________________________

(d) feeding said filtered clean stream to a coking drum wherein it decomposes leaving a mass of anode grade coke.

2. A process according to claim 1 wherein said residual stream is filtered at a temperature of at least 270°

F.

3. A process according to claim 1 wherein said filtered clean stream is coked under the following conditions:

space="preserve" listing-type="tabular">______________________________________ Coking Pressure, psig 15 to 120 Coking Temperature, °

C. 410 to 480 Recycle Ratio 1;

1 to 2;

1. ______________________________________

4. A process according to claim 1 wherein said residual stream is blended with decanted oil characterized by the following composition and properties:

space="preserve" listing-type="tabular">______________________________________ Gravity, °

API -1 to 7.0 Conradson Carbon, wt. % 0.5 to 6.0 Sulfur, wt. % 1.0 to 3.0 Nitrogen, wt. % 0.1 to 0.5 Vanadium, ppm 0.5 to 10 Nickel, ppm 0.1 to 5.0 Aromatics, wt. % 50 to 85 Asphaltenes, wt. % 0.1 to 3.0 Solids content, wt. % 0.01 to 0.5 ______________________________________

in a proportion from about 40 to 75 volume percent of residual and 25 to 60 volume percent of decanted oil prior to filtering.

5. A process according to claim 1 wherein the filtered clean stream is subjected to catalytic hydrodesulfurization under the following conditions:

space="preserve" listing-type="tabular">______________________________________ Hydrogen Pressure, psig 500-2000 Temperature, °

F. 620-790 Space Velocity, l/h 0.2-2.0 H2/feed ratio, N m3/m3 200-1500 ______________________________________

in the presence of a catalyst comprising a refractory support having metals selected from Group VIB and Group VIII of the Periodic Table deposited thereon.

6. A process according to claim 4 wherein the filtered clean blended stream is subjected to catalytic hydrodesulfurization under the following conditions:

space="preserve" listing-type="tabular">______________________________________ Hydrogen Pressure, psig 500-2000 Temperature, °

F. 620-790 Space Velocity, l/h 0.2-2.0 H2/feed ratio, N m3/m3 200-1500. ______________________________________

7. A process according to claim 6 wherein said filtered clean stream is coked under the following conditions:

space="preserve" listing-type="tabular">______________________________________ Coking Pressure, psig 15 to 120 Coking Temperature, °

C. 410 to 480 Recycle Ratio 1;

1 to 2;

1. ______________________________________

8. A process according to claim 1 wherein said recycle stream is blended with a lubricant extract characterized by the following composition and properties:

space="preserve" listing-type="tabular">______________________________________ Gravity, °

API 10 to 20 Conradson Carbon, wt. % 0.05 to 2.5 Sulfur, wt. % 1.5 to 3.0 Nitrogen, wt. % 0.1 to 0.5 Vanadium, ppm 0.1 to 10 Nickel, ppm 0.01 to 5.0 Aromatics, wt. % 55.0 to 75.0 Asphaltenes, wt. % 0.05 to 0.5 ______________________________________ in a proportion from about 40 to 75 volume percent of recycle and 25 to 60 volume percent of lubricant extract prior to filtering.

9. A process according to claim 8 wherein the filtered clean blended stream is subjected to catalytic hydrodesulfurization under the following conditions:

space="preserve" listing-type="tabular">______________________________________ Hydrogen Pressure, psig 500-2000 Temperature, °

F. 620-790 Space Velocity, l/h 0.2-2.0 H2/feed ratio, N m3/m3 200-1500. ______________________________________

10. A process according to claim 9 wherein said filtered clean stream is coked under the following conditions:

space="preserve" listing-type="tabular">______________________________________ Coking Pressure, psig 15 to 120 Coking Temperature, °

C. 410 to 480 Recycle Ratio 1;

1 to 2;

1. ______________________________________