Carbonized soybean hull is a viable replacement for replacement of carbon black. Thus far it works best as up to a 25% replacement of virgin carbon black.
Soybean hull sells for $150/ton and carbon black sells for $2000/ton. % retention after carbonizing soybean hull is 41%. This equates to $820 / ton for carbonized soybean hull if sold at a similar price as carbon black.
The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.