公开(公告)号：US20200248405A1

公开(公告)日：2020-08-06

申请号：US15780792

申请日：2016-12-05

Applicant: SAPPI Netherlands Services B.V.

Inventor： Saschi MOMIN ,  Adrianus Johannes Ernst JANSEN

IPC: D21C9/00 ,  D21H11/18 ,  D21D1/20 ,  D21D1/02

Abstract: A process for reducing the overall energy consumption in the production of nanocellulose dispersions from a base cellulosic material wherein said process comprises an intermediate step reducing the overall energy consumption by at least 50% when compared to a process lacking said intermediate step.

公开(公告)号：US20180362735A1

公开(公告)日：2018-12-20

申请号：US15736811

申请日：2016-06-16

Applicant: SAPPI Netherlands Services B.V.

Inventor： Wim BALLET ,  Seda CANTEKIN ,  Gustavo DUARTE ,  Saschi MOMIN ,  Jo SIMONS

IPC: C08L1/02 ,  C08J3/09 ,  C08J3/12

Abstract: The present invention provides for a dispersion containing cellulose particles dispersed in a continuous liquid phase comprising a first and a second continuous liquid phase, wherein the first continuous liquid phase consists of a liquid swelling agent or an aqueous solution of said liquid swelling agent, and the second continuous liquid phase comprises, preferably consists of, one or more organic solvents, with the proviso that the one or more organic solvents of the second continuous liquid phase are not capable of dissolving cellulose, have a boiling point higher than the boiling point of the first continuous liquid phase, and are miscible with the constituents of the swelling composition.

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.