Physical pre-treatments are based on physical principles whithout significantly changing the chemical structure of the feedstock. A change in the overall chemical composition might occur due to physical separation of different substances.
DensificationDrying (evaporation)
Air drying
Nitrogen drying
Freeze drying
Thermal drying
Separation
Centrifugation
Dialysis
Distillation
Field-Flow fractionation (FFF)
Filtration
Membrane Filtration
Pressure filtration
Ultrafiltration
Sedimentation
Sieving
Steam explosionSizing