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) |