Particulate carbon material producible from renewable raw materials and method for its production
The present invention relates to a particulate carbon material that can be produced from renewable raw materials, in particular from biomass containing lignin, comprising: a 14 C content that corresponds to that of the renewable raw materials, said content being preferably greater than 0.20 Bq/g carbon, especially preferably greater than 0.23 Bq/g carbon, but preferably less than 0.45 Bq/g carbon in each case; a carbon content in relation to the ash-free dry substance of between 60 ma. % and 80 ma. %; an STSA surface area of the primary particles of at least 5 m 2 /g and at most 200 m 2 /g; and an oil absorption value (OAN) of between 50 ml/100 g and 150 ml/100 g. The present invention also relates to a method for producing said carbon material and to the use thereof.
1. A particulate carbon material producible from renewable raw materials of lignin-containing biomass, the particulate carbon material having:
a 14 C content greater than 0.20 Bq/g of carbon and less than 0.45 Bq/g of carbon;
a carbon content based on the ash-free dry substance between 60 wt-% and 80 wt-%;
an STSA surface area of at least 5 m 2 /g and maximally 200 m 2 /g; and
an oil absorption value (OAN) between 50 ml/100 g and 150 ml/100 g.
2. The particulate carbon material according to claim 1 , characterized in that its BET surface area differs from its STSA surface area by maximally 20%.
3. The particulate carbon material according to claim 1 , wherein a 15% suspension of the particulate carbon material in distilled water has an electrical conductivity of less than 5 mS/cm.
4. The particulate carbon material according to claim 1 , wherein a 15% suspension of the particulate carbon material in distilled water has a pH value of >6.
5. The particulate carbon material according to claim 1 , further having a D/G signal ratio in the Raman spectrum between 0.20 and 0.90.
6. The particulate carbon material according to claim 1 , further having a high resistance to bases, wherein less than 40% of the particulate carbon material present goes into basic solution.
7. The particulate carbon material according to claim 1 , further having a D90 of a Q3 distribution of a grain size of less than 30 μm.
8. The particulate carbon material according to claim 1 , wherein the 14 C content corresponding to that of renewable raw materials is greater than 0.23 Bq/g of carbon and less than 0.45 Bq/g of carbon.
9. The particulate carbon material according to claim 1 , further having a carbon content based on the ash-free dry substance between 65 wt-% and 75 wt %.
10. The particulate carbon material according to claim 1 , further having an STSA surface area of between 8 m 2 /g and 100 m 2 /g.
11. The particulate carbon material according to claim 1 , wherein the BET surface area of the particulate carbon material differs from the STSA surface area by no more than 15%.
12. The particulate carbon material according to claim 1 , further having a surface chemistry comparable to silica with a high OH-group density.
13. The particulate carbon material according to claim 12 , wherein oxygen content of the ash-free particulate carbon material is between 20 wt-% and 30 wt-%.
14. The particulate carbon material according to claim 2 , wherein a 15% suspension of the particulate carbon material in distilled water has a pH value of >6.
15. The particulate carbon material according to claim 2 , wherein a 15% suspension of the particulate carbon material in distilled water has an electrical conductivity of less than 5 mS/cm.
16. The particulate carbon material according to claim 15 , wherein a 15% suspension of the particulate carbon material in distilled water has a pH value of >6.
17. The particulate carbon material according to claim 3 , wherein the 15% suspension of the particulate carbon material in distilled water has an electrical conductivity of less than 3 mS/cm.
18. The particulate carbon material according to claim 17 , wherein the 15% suspension of the particulate carbon material in distilled water has an electrical conductivity of less than 2 mS/cm.
19. The particular carbon material according to claim 14 , wherein the particulate carbon material is not a carbon black material.
20. The particular carbon material according to claim 14 , wherein the particulate carbon material is neither a conventional carbon black material nor a bio-based carbon black material.
21. The particular carbon material according to claim 14 , wherein the carbon content based on the ash free dry substance differs from conventional carbon black produced by means of common carbon black production processes or variants of bio-based carbon black produced by means of a carbon black production process, pyrolysis, partial oxidation.
22. A particulate carbon material producible from renewable raw materials, the particulate carbon material having:
a 14 C content greater than 0.20 Bq/g of carbon and less than 0.45 Bq/g of carbon;
a carbon content based on the ash-free dry substance between 60 wt-% and 80 wt-%;
an STSA surface area of at least 5 m 2 /g and maximally 200 m 2 /g; and
an oil absorption value (OAN) between 50 ml/100 g and 150 ml/100 g,
wherein the particulate carbon material is not a carbon black material.
23. The particular carbon material according to claim 22 , wherein the particulate carbon material is neither a classical carbon black material nor a bio-based carbon black material.
24. The particular carbon material according to claim 14 , wherein the BET surface area of the particulate carbon material differs from the STSA surface area by no more than 10%.
25. The particulate carbon material according to claim 14 , characterized in that it has a pore volume of <0.1 cm 3 /g.
26. The particulate carbon material according to claim 14 , characterized in that it has a pore volume of <0.01 cm 3 /g.
27. The particulate carbon material according to claim 14 , characterized in that it has a pore volume of <0.005 cm 3 /g.
28. The particulate carbon material according to claim 14 , characterized in that it is not activated carbon.