CARBON PRODUCTS DERIVED FROM LIGNIN/CARBON RESIDUE
A precursor having at least five percent of lignin based coke and d 002 spacing of more than 3.36 angstroms and less 3.44 for making graphite. Methods for making a green/graphite article include mixing coke derived from a petroleum product, a coal product or a bitumen product with coke derived from lignin. Alternatively, the precursor material for the various types of coke may be mixed and coked together. The mixture may be formed into a desired shape. The article may be subsequently carbonized and graphitized. The amount of lignin derived coke comprises a sufficient quantity to change at least a selected property of the graphite article.
1 . A method of making a green article comprising:
a. mixing a first amount of coke precursor material derived from a petroleum product with a second amount of coke precursor material derived from lignin, thereby forming a precursor mixture;
b. coking the precursor mixture thereby forming coke; and
c. forming the coke into a desired orientation
whereby the second amount of coke precursor comprises a sufficient quantity to change at least one selected property of a final article formed to obtain the desired set of properties in the final article as compared to a second final article made from the coke precursor material derived from the petroleum product.
2 . The method of the claim 1 wherein the second amount of coke precursor material derived from lignin comprises by weight at least 0.01 percent to less than 50 percent of a total amount precursor material used to make the coke.
3 . The method of claim 1 wherein the first amount of coke precursor material derived from the petroleum product comprises at least one of decant oil, decant oil based pitch, petroleum pitch and combinations thereof.
4 . The method of claim 1 wherein the petroleum product comprises decant oil and the first amount of coke comprises needle coke.
5 . The method of claim 1 wherein the selected property includes the coefficient of thermal expansion (CTE).
6 . The method of claim 1 wherein the selected property includes the d 002 spacing between layered planes within the graphite article.
7 . The method of claim 1 wherein the selected property includes the char weight of the graphite article.
8 . The method of claim 1 wherein the selected property includes the modified Conradson carbon (MCC) of the graphite article.
9 . The method of claim 1 wherein the selected property includes coke yield.
10 . The method of claim 1 wherein the selected property includes at least one of bulk density of the graphite article, specific resistance of the graphite article and real density of the graphite article.
11 . A graphite article made by the method of claim 1 , wherein the graphite article has a volume of at least 1 cubic centimeter formed from a precursor including at least five percent by weight of lignin based coke and the graphite article has d 002 spacing of more than 3.36 angstroms and less 3.44.
12 . A graphite article made by the method of claim 1 , wherein the graphite article exhibits a 2θ angle between 26° and 2.7°.
13 . A graphite article made by e method of claim 1 , wherein the graphite article has a CTE of at least 0.26 ppm/° C.
14 . The graphite of claim 13 , wherein the graphite article has a CTE of at least 1.59 ppm/° C.
15 . A method of making a green article comprising:
a. mixing a first amount of coke precursor material derived from a carbon residue having a carbon content of at least 70 percent with a second amount of coke precursor material derived from lignin, thereby forming a precursor mixture;
b. coking the precursor mixture thereby forming coke; and
c. forming the coke into a desired orientation,
whereby the second amount of coke precursor comprises a sufficient quantity to change selected properties of a final article formed to obtain the desired set of properties in the final article as compared to a second final article made from the coke precursor material having the carbon content of at least 70 percent.
16 . The method of claim 15 wherein the carbon residue comprises a petroleum product.
17 . The method of claim 15 wherein the second amount of coke precursor material derived from lignin comprises by weight at least 0.01 percent to less than 50 percent of a total amount of precursor material used to make the coke.
18 . A monolithic graphite article having a volume of at least 1 cubic centimeter formed from a precursor including at least five percent by weight of lignin based coke and d 002 spacing of more than 3.36 angstroms and less 3.44.
19 . The graphite article of claim 18 , wherein the graphite article exhibits a 2θ angle between 26° and 27°.
20 . The graphite article of claim 18 , wherein the graphite article has a CTE of at least 0.26 ppm/° C.