Upgrading of pyrolysis tar

• US 4,762,608 A
• Filed: 12/20/1984
• Issued: 08/09/1988
• Est. Priority Date: 12/20/1984
• Status: Expired due to Fees

• Current Assignee: Ucar Carbon Technology Corporation
• Original Assignee: Union Carbide Corporation (Dow, Inc.)
• Inventors: Didchenko, Rostislav, Dickinson, Eric M.
• Primary Examiner(s): Sneed, H. M. S.
• Assistant Examiner(s): Myers, Helane
• Application Number:
  US06/684,140
• Time in Patent Office: 1,328 Days
• Field of Search: 208/44, 208/50, 208/89, 208/111, 208/131, 208/57
• US Class Current: 208/89
• 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 57/045 containing mineral oils, bitumen, tar or the like or mixtures thereof
• CPC Class Codes: C10G 45/02 to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing

Abstract

Pyrolysis tars are upgraded by hydrotreatment in the presence of a catalyst having a hydrogenation component and an acidic component. The treated pyrolysis tars are used to produce premium cokes useful in the production of graphite electrodes.

Claims

1. A method for upgrading a pyrolysis tar used to form coke which comprises hydrotreating a pyrolysis tar feed in the presence of a catalyst having a hydrogenation component and an acidic component provided by crystalline alumino-silicate, noncrystalline alumino-silicate, acidic alumina, sulfated zirconia, steam activated alumina, or steam activated alumino-silicate, wherein the catalyst has at least about 65 micromoles of acid sites per gram of the catalyst, wherein the acid sites per gram are measured by the ammonia adsorption/TGA method at about 400°

C. after calcination of the catalyst to 500°

C.; and

producing hydrogen while hydrotreating the pyrolysis tar feed.

2. The method of claim 1 wherein the hydrogenation component is provided by a metal, salt, oxide, or sulfide of a Group VIII or VI-B metal.

3. The method of claim 1 wherein the hydrogenation component is provided by molybdenum, cobalt, platinum, or sulfided nickel.

4. The method of claim 1 wherein the hydrotreated pyrolysis tar is capable of forming a premium coke when subjected to destructive distillation conditions.

5. The method of claim 1 wherein the hydrotreatment is carried out at a pressure between about 3.4 and about 13.8 megapascals, and at a temperature between about 260°

C. and about 425°

C.

6. The method of claim 1 wherein the hydrotreatment is carried out at a pressure between about 3.4 and about 13.8 megapascals, and at a temperature is between about 290°

C. and about 370°

C.

12. The method of claim 1 wherein the acidic component is provided by LZ-10.

7. A method for producing premium coke, which comprises (a) hydrotreating a pyrolysis tar feed in the presence of a catalyst having a hydrogenation component and an acidic component provided by crystalline alumino-silicate, noncrystalline alumino-silicate, acidic alumina, sulfated zirconia, steam activated alumina, or steam activated alumino-silicate, wherein the catalyst has at least about 65 micromoles of acid sites per gram of catalyst, wherein the acid sites per gram are measured by the ammonia adsorption/TGA method at about 400°

C. after calcination of the catalyst to 500°

C.;

(b) producing hydrogen while hydrotreating the pyrolysis tar feed; and

(c) subjecting the hydrotreated pyrolysis tar to destructive distillation conditions to form a coke.

8. The method of claim 7 wherein the hydrogenation component is provided by a metal, salt, oxide or sulfide of a Group VIII or VI-B metal.

9. The method of claim 7 wherein the hydrogenation component is provided by molybdenum, cobalt, platinum, or sulfided nickel.

10. The method of claim 7 wherein the pressure in step (a) is between about 3.4 and about 13.8 megapascals, and the temperature in step (a) is between about 260°

C. and about 425°

C.

11. The method of claim 7 wherein the pressure in step (a) is between about 3.4 and about 13.8 megapascals, and the temperature in step (a) is between about 290°

C. and about 370°

C.

13. The method of claim 7 wherein the acidic component is provided by LZ-10.

14. A method for upgrading a pyrolysis tar used to form coke which comprises hydrotreating a pyrolysis tar feed in the presence of a catalyst having a hydrogenation component and an acidic component provided by crystalline alumino-silicate, noncrystalline alumino-silicate, acidic alumina, sulfated zirconia, steam activated alumina, or steam activated alumino-silicate, wherein the catalyst has at least about 65 micromoles of acid sites per gram of the catalyst, wherein the acid sites per gram are measured by the ammonia adsorption/TGA method at about 400°

C. after calcination of the catalyst to 500°

C.

15. A method for producing premium coke, which comprises (a) hydrotreating a pyrolysis tar feed in the presence of a catalyst having a hydrogenation component and an acidic component provided by crystalline alumino-silicate, noncrystalline alumino-silicate, acidic alumina, sulfated zirconia, steam activated alumina, or steam activated alumino-silicate, wherein the catalyst has at least about 65 micromoles of acid sites per gram of catalyst, wherein the acid sites per gram are measured by the ammonia adsorption/TGA method at about 400°

C. after calcination of the catalyst to 500°

C.; and

(b) subjecting the hydrotreated pyrolysis tar to destructive distillation conditions to form a coke.