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US 8,007,660 B2Granted
Reduced puffing needle coke from decant oil
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 from decant oil, 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.
Claims22
A method of creating reduced puffing needle coke, comprising:
- a. passing decant oil through an activated carbon nitrogen removal system to remove nitrogen from the decant oil by adsorption and to produce reduced nitrogen decant oil;
- b. hydrodesulfurizing the reduced nitrogen decant oil to create low-sulfur, reduced nitrogen decant oil;
- c. coking the low-sulfur, reduced nitrogen decant oil
- d. calcining the coke obtained from step (c) to create reduced puffing needle coke.
1 more element
A method of creating reduced puffing needle coke, comprising:
- a. removing ash from decant oil to create ash-reduced decant oil;
- b. passing the ash-reduced decant oil through an adsorption zone to produce reduced nitrogen decant oil;
- c. coking the reduced nitrogen decant oil
- d. calcining the coke obtained from step (c) to create reduced puffing needle coke.
1 more element
Dependencies are inferred from the claim text.