DEVELOPMENT OF CONTINUOUS SOLVENT EXTRACTION PROCESSES FOR COAL DERIVED CARBON PRODUCTS Page: 3 of 22
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The purpose of this DOE-funded effort is to develop continuous processes for
solvent extraction of coal for the production of carbon products. These carbon products
include materials used in metals smelting, especially in the aluminum and steel industries,
as well as porous carbon structural material referred to as "carbon foam" and carbon
fibers. There are a number of parameters which are important for the production of
acceptable cokes, including purity, structure, density, electrical resistivity, thermal
conductivity etc. From the standpoint of a manufacturer of graphite electrodes such as
GrafTech, one of the most important parameters is coefficient of thermal expansion
(CTE). Because GrafTech material is usually fully graphitized (i.e., heat treated at 3100
C), very high purity is automatically achieved. The degree of graphitization controls
properties such as CTE, electrical resistivity, thermal conductivity, and density. Thus it
is usually possible to correlate these properties using a single parameter. CTE has proven
to be a useful index for the quality of coke. Pure graphite actually has a slightly negative
coefficient of thermal expansion, whereas more disordered carbon has a positive
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Kennel, Elliot B.; Biedler, Philip L.; Chen, Chong; Dadyburjor, Dady; Magean, Liviu; Stansberry, Peter G. et al. DEVELOPMENT OF CONTINUOUS SOLVENT EXTRACTION PROCESSES FOR COAL DERIVED CARBON PRODUCTS, report, June 23, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc785013/m1/3/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.