Enhanced biochar

Patent metadata

Field	Value
Publication number	US-11111185-B2
Application number	US-201916406986-A
Country	US
Kind code	B2
Filing date	May 8, 2019
Priority date	Oct 1, 2014
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

Biochar is provided that is treated to have certain chemical and physical properties found to have the highest impact on plant growth and/or soil health. In particular, the following physical and/or chemical properties, among others, of a biochar have been identified as critical properties to control for in the selection of biomass feedstock, pyrolysis conditions, and/or enhancing treatment to increase biochar performance: (i) bulk density (ii) impregnation capacity; (iii) particle size distribution; (iv) solid particle density; (v) surface area; (vi) porosity; (vii) total porosity; (viii) ratio of macroporosity to total porosity (ix) content of residual organic compounds; (x) content of volatile organic compounds; (xii) ash content; (xiii) water holding capacity; (xiv) water retention capabilities; (xv) levels of dioxins and other potentially hazardous byproducts of pyrolysis; and (xvi) pH. Treatment can modify and preferably increase hydrophilicity/decrease hydrophobicity, remove dioxins from the raw biochar, modify electrical conductivity and/or surface charge, modify cation exchange capacity and modify anion exchange capacity, among other things.

First claim

What is claimed is:

1. A plurality of porous carbonaceous particles, where a hydrophobicity of the plurality of porous carbonaceous particles under the molarity of ethanol drop (MED) test method has an index of at most 5.

2. The plurality of porous carbonaceous particles of claim 1 , wherein at least 75% of the plurality of porous carbonaceous particles, measured by weight or volume, have a particle size of at most 10 mm.

3. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated to have at least 10% of the pores, by volume, filled with an infiltrate.

4. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises at least 55% carbon by weight.

5. The plurality of porous carbonaceous particles of claim 1 , wherein the bulk density of the plurality of porous carbonaceous particles measured by weight, is at least 0.1 and at most 0.6 g/cm 3 .

6. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises a ratio of macropore volume to total pore volume of at least 50%.

7. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprise at most 5% by weight of volatile organic compounds.

8. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises a cation exchange capacity of at least 5 milliequ/l.

9. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises an anion exchange capacity of at least 5 milliequ/l.

10. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises a water holding capacity of at least 30% by weight.

11. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated by rapidly infusing an additive into the pores of the plurality of porous carbonaceous particles using a vacuum processing treatment.

12. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated by infusing an additive into the pores of the plurality of porous carbonaceous particles using a surfactant infusion treatment.

13. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated by infusing an additive into the pores of the plurality of porous carbonaceous particles, and wherein the infusing comprises a surfactant infusion treatment and a vacuum infusion treatment.

14. The plurality of porous carbonaceous particles of claim 1 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated by infusing an additive into the pores, and wherein the additive is a soil enhancing agent selected from the group consisting of water, water solutions of salts, inorganic and organic liquids of different polarities, liquid organic compounds or combinations of organic compounds and solvents, mineral and organic oils, slurries and suspensions, supercritical liquids, fertilizers, plant growth promoting rhizobacteria, free-living and nodule-forming nitrogen fixing bacteria, organic decomposers, nitrifying bacteria, phosphate solubilizing bacteria, biocontrol agents, bioremediation agents, saprotrophic fungi, ectomycorrhizae, and endomycorrhizae.

15. A plurality of porous carbonaceous particles, wherein the plurality of porous carbonaceous particles exhibits weight loss of more than at least 1% in the interval between 43° C. and 60° C. when performing the Bontchev-Cheyne Test.

16. The plurality of porous carbonaceous particles of claim 15 , wherein at least 75% of the plurality of porous carbonaceous particles have a particle size of at most 10 mm.

17. The plurality of porous carbonaceous particles of claim 15 , wherein the plurality of porous carbonaceous particles comprises a ratio of macropore volume to total pore volume of at least 50%.

18. The plurality of porous carbonaceous particles of claim 15 , wherein the plurality of porous carbonaceous particles has comprises a water holding capacity of at least 30% by weight.

19. The plurality of porous carbonaceous particles of claim 15 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated by rapidly infusing a liquid into the pores of the plurality of porous carbonaceous particles.

20. The plurality of porous carbonaceous particles of claim 19 , wherein the treatment for rapidly infusing the liquid into the pores of the plurality of porous carbonaceous particles is a vacuum processing treatment.

21. A plurality of porous carbonaceous particles, wherein the plurality of porous carbonaceous particles meets EU Feed limit for dioxins of at most 0.75 ng/kg WHO-PCDD/F-TEQ//kg.

22. The plurality of porous carbonaceous particles of claim 21 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein the plurality of porous carbonaceous particles has been treated to have at least 10% of the pores, by volume, infused with an infiltrate.

23. The plurality of porous carbonaceous particles of claim 21 , wherein at least 75% of the porous carbonaceous particles, measured by weight or volume, have a particle size of at most 10 mm.

24. The plurality of porous carbonaceous particles of claim 21 , wherein the plurality of porous carbonaceous particles comprises at least 55% carbon by weight.

25. The plurality of porous carbonaceous particles of claim 21 , wherein the plurality of porous carbonaceous particles comprises pores, and wherein greater than 75% of the pores, by volume, measure less than 50,000 nanometers using mercury porosimetry testing.

Assignees

• Carbon Tech Holdings Llc

Inventors

• Bontchev Ranko
• Kim Han Suk
• Wilson Richard W
• Belcher Richard Wilson
• Cheyne Cameron
• Manzer Leo E
• Jarand Mark L
• Wan Haijun
• Malyala Rajashekharam

Classifications

• C05D9/00 Primary

  Other inorganic fertilisers · CPC title

• C09K17/04

  applied in a physical form other than a solution or a grout, e.g. as granules or gases · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• C05D9/02

  containing trace elements · CPC title

• C05F11/02

  from peat, brown coal, and similar vegetable deposits · CPC title