Carbon products derived from lignin/carbon residue
A precursor having at least five percent of lignin based coke and d002 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. method of making a graphite article with a desired set of properties, comprising:
a. mixing a first amount of coke derived from a petroleum product with a second amount of coke derived from lignin, thereby forming a green mixture;
b. forming the green mixture into a desired shape, thereby forming a green article; and
c. carbonizing and graphitizing the green article,
whereby the second amount of coke comprises a sufficient quantity to change at least a selected property of the graphite article to obtain the desired set of properties of the graphite article as compared to a second graphite article made from the coke derived from the petroleum product.
2. The method of claim 1 wherein the petroleum product comprises at least one of decant oil, decant oil based pitch, petroleum pitch and combinations thereof.
3. The method of claim 1 wherein the second amount comprises by weight at least 0.01 percent to less than 50 percent of a total amount of coke used to make the graphite article.
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. The method of claim 1 further comprising forming the second amount of coke by mixing solid lignin and decant oil.
12. The method of claim 11 wherein the forming further comprises:
heating the decant oil; and
mixing the heated decant oil with the solid lignin via mechanical stirring.
13. The method of claim 12 further comprising forming the second amount of coke by pyrolizing the lignin and the decant oil.