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US 4,289,604 AGranted
Method of producing an isotropic coke
AssigneesBergwerksverband GmbH, Sigri Elektrographit GmbH
InventorsGeorg Kolling, Gerhard Pietzka, Ingo Romey, Harald Tillmanns
Life of this patent
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Abstract
Manufacture of isotropic coke by first selecting as feed material tar from low temperature carbonization with a hydrogen content above 5.5%, a carbon content less than 88% and a softening point above 60.degree. C., filtering the tar to remove solid particles, and heating the filtrate to a temperature between about 900.degree. C. and 1300.degree. C. to form an isotropic coke.
Claims2
Method for manufacturing an isotropic coke, which comprises subjecting tar from
- (a) low temperature carbonization of bitumen,
- (b) having a hydrogen content of more than 5.5%,
- (c) a carbon content of less than 88% and a softening point above 60.degree. C., to
- (d) filtration to remove solid particles therefrom, and
- (e) heating the filtrate to a temperature between about 900.degree. C. and 1300.degree. C., to convert the filtrate to an isotropic coke characterized by a thermal volume expansion coefficient of about 13.5.times.10.sup.-6 /K and a degree of anisotropy of less than 1.2,
- (f) wherein said filtrate is heated to 350.degree. C. with a temperature gradient of 100.degree. to 300.degree. C./hr, from 350.degree. to 460.degree. C. with a gradient of 5.degree. to 50.degree. C./hr and from 460.degree. to 900.degree. to 1300.degree. C. with a gradient of more than 50.degree. C./hr.
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Dependencies are inferred from the claim text.