US4762608A
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US
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Upgrading of pyrolysis tar
Assignee: Graftech Technology LLC
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Filing: 1984-12-20
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Granted: 1988-08-09
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Expires: 2004-12-20
Abstract
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.
Inventors
- 👤 Rostislav Didchenko
- 👤 Eric M. Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:55
CPC Classifications
C; C10; C10B; C10B55/00; C10B57/00; C10B57/04; C10B57/045; C10G; C10G45/00; C10G45/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
100 words
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.
Claim 2
Independent Claim
100 words
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.
Claim 3
Dependent Claim
25 words
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.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the hydrogenation component is provided by molybdenum, cobalt, platinum, or sulfided nickel.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the hydrotreated pyrolysis tar is capable of forming a premium coke when subjected to destructive distillation conditions.
Claim 6
Dependent Claim
33 words
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.
Claim 7
Dependent Claim
34 words
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.
Claim 8
Independent Claim
110 words
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.
Claim 9
Independent Claim
110 words
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.
Claim 10
Dependent Claim
25 words
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.
Claim 11
Dependent Claim
18 words
The method of claim 7 wherein the hydrogenation component is provided by molybdenum, cobalt, platinum, or sulfided nickel.
Claim 12
Dependent Claim
34 words
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.
Claim 13
Dependent Claim
34 words
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.
Claim 14
Dependent Claim
13 words
The method of claim 1 wherein the acidic component is provided by LZ-10.
Claim 15
Dependent Claim
13 words
The method of claim 7 wherein the acidic component is provided by LZ-10.
Claim 16
Independent Claim
91 words
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.
Claim 17
Independent Claim
91 words
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.
Claim 18
Independent Claim
101 words
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.
Claim 19
Independent Claim
101 words
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.
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