Supercritical CO2 cellulose spraydrying

The present invention provides for a process for producing dry， water-dispersible， non-surface modified nanocellulose particles or a powderous composition r comprising said particles comprising the steps of: i. providing a first suspension of non-surface modified cellulose particles in an first aqueous liquid， which aqueous liquid is non-solubilizing for the non-surface modified nanocellulose particles， ii. exchanging substantially all of the first aqueous liquid of the first suspension for a second solvent， which is miscible with the first aqueous liquid and non-solubilizing for the non-surface modified nanocellulose particles， to form a second suspension of non-surface modified nanocellulose particles in said second solvent， iii. contacting a flow of the second suspension of non-surface modified nanocellulose particles with a flow of a fluid in a supercritical or critical state， which fluid in a supercritical or critical state is miscible with the second solvent and non-solvating for the non- surface modified nanocellulose particles under conditions suitable for the transfer of substantially all of the second solvent into the supercritical fluid， iv. removing the second solvent and the fluid in a supercritical or critical state， preferably by controlling pressure and/or temperature， to form the dry， water-dispersible nanocellulose particles， v. collecting the dry， water-dispersible， non-surface modified nanocellulose particles and/or forming the powderous composition comprising said particles.