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. 2021 Oct 27;11(55):34870–34897. doi: 10.1039/d1ra06736b

Comparison of thermochemical processes for biomass transformation7–10.

Process Temperature (°C) Residence time Pressure (bar) Other conditions Typical product distribution (weight%)
Solid Liquids Gases
Gasification 900–1500 10–20 s 1 Limited oxygen supply 10 5 85
Moisture content 10–20%
Dry torrefaction (mild pyrolysis) 200–300 1 h 1 No oxygen 80–90 5–10 0–10
Moisture content <10%
Slow pyrolysis 350–400 5 min–12 h 1 No oxygen 25–35 20–50 20–50
Moisture content 15–20%
Intermediate pyrolysis 350–450 4 min 1 No oxygen 30–40 35–45 20–30
Moisture content <10%
Fast pyrolysis 450–550 1–5 s 1 No oxygen 10–25 50–70 10–30
Moisture content <10%
Wet 180–250 0.5–8 h 10–40 Moisture content 75–90% 50–80 5–20 2–5
Pyrolysis (HTC)