公开(公告)号：US20190263975A1

公开(公告)日：2019-08-29

申请号：US16343461

申请日：2017-11-07

Applicant: SAPPI Netherlands Services B.V.

Inventor： Math JENNEKENS ,  Daniela Oana TRAMBITAS ,  Tjerk Jan DE VRIES

IPC: C08J3/12 ,  B01D1/18

Abstract: A process for producing non-surface modified nanocellulose particles in the form of a powder, comprising the steps of i. providing a suspension of never-dried, non-surface modified nanocellulose particles in an aqueous liquid, which is non-solubilising for the non-surface modified nanocellulose particles, and which is water or an aqueous solution of morpholine or piperidine or mixtures thereof, ii. contacting the suspension of non-surface modified nanocellulose particles with a fluid in a supercritical state, which fluid is miscible with the aqueous liquid and is non-solubilising for the non-surface modified nanocellulose particles, under conditions suitable for the transfer of the aqueous liquid into the fluid in a supercritical state, iii. removing the aqueous liquid and the fluid in a supercritical state by controlling pressure and/or temperature, to form the non-surface modified nanocellulose particles, and iv. collecting the non-surface modified nanocellulose particles, wherein the fluid includes ammonia (NH3) in a supercritical state.

公开(公告)号：US20180282490A1

公开(公告)日：2018-10-04

申请号：US15762901

申请日：2016-09-26

Applicant: SAPPI Netherlands Services B.V.

Inventor： Reyes MENENDEZ GONZALEZ ,  Daniela Oana TRAMBITAS ,  Seda CANTEKIN ,  Ian GRAVESON ,  Math JENNEKENS ,  Saschi MOMIN

IPC: C08J3/12 ,  C08J3/09 ,  C08J3/03 ,  B01D1/18 ,  B01D11/02

Abstract: 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.