US 12,123,143 B2 · Process for producing a nanocelullosic material comprising at least two stages of defibrillation of cellulosic feedstock and at least one intermediate fractioning stage

Abstract

The present invention relates to a process for producing a nanocellulosic material based on the use of fractioning of cellulosic pulp stream from pre-treatment or mechanical defibrillation (partially refined/defibrillated pulp) in combination with stages of mechanical defibrillation, in which both the accept fraction and the reject fraction can be conveyed to stages of consistency adjustments so as to precede another distinct defibrillation stage. For example, if the accept is conveyed to a consistency adjustment preceding a second defibrillation stage while the reject is conveyed to the other independent stage of consistency adjustment to return to the first stage of mechanical defibrillation.

Claims15

Dependent claims

Process for producing a nanocellulosic material, from a cellulosic feedstock, comprising at least two stages of defibrillation of said cellulosic feedstock, wherein the process comprises the step:

(a) providing a cellulosic feedstock;
(b) performing a first defibrillation stage of said feedstock;
(c) performing an adjustment of a consistency of the defibrillated feedstock of stage (b);
(d) performing at least a first selection/fractionation stage of the feedstock of stage (c);
(e) conveying the stream of the particles of a reject fraction from (d) to stage (b);
(f) conveying particles of an accept fraction from stage (d) to stage (g);
(g) performing a second defibrillation stage of said feedstock;
and
(g) recovering nanocellulosic material from stage (g).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/260,916Filed 17 Jul 2019

Priority

BR 102018014608-417 Jul 2018

Published

US 2021/0395949 A123 Dec 2021

Granted

22 Oct 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

D21H 11/18
Modified by a particular after-treatment: highly hydrated, swollen or fibrillatable fibres
B02C 23/12
With separator arranged in discharge path of crushing or disintegrating zone: with return of oversize material to crushing or disintegrating zone
C08B 15/08
Preparation of other cellulose derivatives or modified cellulose , e.g. complexes: fractionation of cellulose, e.g. separation of cellulose…
D21B 1/30
By wet methods, by the use of steam: defibrating by other means

Process for producing a nanocelullosic material comprising at least two stages of defibrillation of cellulosic feedstock and at least one intermediate fractioning stage

Life of this patent

Process for producing a nanocelullosic material comprising at least two stages of defibrillation of cellulosic feedstock and at least one intermediate fractioning stage

Life of this patent

Abstract

Claims15