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US 8,007,658 B2Granted
Reduced puffing needle coke from coal tar
AssigneeGrafTech International Holdings Inc.
InventorsDouglas J. Miller, Ching-Feng Chang, Irwin C. Lewis, Aaron Tomasek, Richard L. Shao
Life of this patent
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Abstract
A reduced puffing needle coke is formed, which includes a lesser amount of nitrogen within the coke so that carbon articles produced from such coke experience minimal expansion upon heating to graphitization temperatures.
Claims23
A method of creating reduced puffing needle coke, comprising:
- a. selecting coal tar;
- b. removing quinoline insolubles from the coal tar to create quinoline insoluble reduced coal tar;
- c. passing the quinoline insoluble free coal tar through an activated carbon nitrogen removal system to remove nitrogen from the quinoline insoluble free coal tar by adsorption and to produce reduced nitrogen coal tar;
- d. coking the reduced nitrogen coal tar
- e. calcining the coke obtained from the nitrogen reduced coal tar to create calcined reduced puffing needle coke.
2 more elements
A method of creating reduced puffing needle coke, comprising:
- a. selecting coal tar;
- b. removing quinoline insolubles from the coal tar to create essentially quinoline insoluble free coal tar;
- c. passing the essentially quinoline insoluble free coal tar through an adsorption zone to produce reduced nitrogen coal tar;
- d. coking the reduced nitrogen coal tar
- e. calcining the coke obtained from the nitrogen reduced coal tar to create calcined reduced puffing needle coke.
2 more elements
Dependencies are inferred from the claim text.