公开(公告)号：US20190002591A1

公开(公告)日：2019-01-03

申请号：US16064830

申请日：2016-12-19

Applicant: SAPPI Netherlands Services B.V.

Inventor： Robert ENGLISH ,  Ian GRAVESON ,  Saschi MOMIN ,  Nadege FERLIN

IPC: C08B3/10 ,  C08B3/08

Abstract: A process for the preparation of particulate acylated biopolymer comprising anhydroglucose units that comprises several steps. First, dispersing an amount of particulate non-surface modified biopolymer comprising anhydroglucose units in an amount of a liquid alkenyl carboxylatein order to form a first dispersion. Then, adding a catalytic composition to the first dispersion such a to form a second dispersion, heating the second dispersion to a temperature above ambient temperature, and cooling the second dispersion to ambient temperature. Thereafter, the obtained particulate acylated biopolymer is isolated. The amount of a liquid alkenyl carboxylate corresponds to a molar excess of alkenyl carboxylate, the molar excess being defined with respect to the moles of anhydroglucose units comprised in the amount of the particulate non-surface modified biopolymer. The catalytic composition comprises an amount of one, or two or more, non-nucleophilic bases.

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.