GRANULAR CARBON MATERIAL OBTAINED FROM RENEWABLE RAW MATERIAL Russian patent published in 2020 - IPC C09C1/48 C08K3/13 C08K3/04 C10B53/02 

FIELD: chemical industry; environmental protection.

SUBSTANCE: invention can be used in making fillers for polymer articles. Granular carbon material is obtained by hydrothermal method from renewable raw material, in particular, from ligno-containing biomass. Granular carbon material is characterized by ¹⁴C content of more than 0.20 Bq/g of carbon and less than 0.45 Bq/g of carbon; carbon content in terms of ash-free dry substance of 60–80 wt %; STSA-surface of 5–200 m²/g; oil absorption coefficient (OAN) of 50 ml/100 g to 150 ml/100 g, wherein BET surface differs from STSA-surface by not more than 20 %, as well as ratio of D/G signals in the Raman spectrum from 0.20 to 0.90. 15 % suspension of granular carbon material in distilled water has electric conductivity less than 5 mS/cm and pH>6. Said material is also slightly soluble in alkaline solution and has high resistance to alkalis.

EFFECT: invention enables to maintain neutral CO₂ balance when producing said material and thereby eliminate additional emissions to atmosphere, and also to replace technical carbon with high-quality and environmentally friendly filler.

13 cl, 11 tbl, 17 ex, 6 dwg