US 2017/0362342 A1 · METHOD FOR PREPARING CELLULOSE DOPE

Abstract

The invention relates to a method for preparing a cellulose dope comprising mixing and dissolving the cellulosic raw material in dilute and concentrated aqueous organic solvent in a two-stage process to form a homogeneous slurry, followed by heating the homogeneous slurry to obtain a cellulose dope containing 11% to 20% cellulose by weight. The invention also relates to a cellulose dope comprising 11% to 20% cellulose by weight and 73% to 79% aqueous organic solvent wherein the concentration of the cellulosic and metallic impurities in the cellulose dope shows a percent reduction of 20% to 50% from the cellulosic raw material.

Claims10

Dependent claims

1) A method for preparing a cellulose dope comprising the steps of:

a) mixing cellulosic raw material and an anti-oxidant with 10% to 65% aqueous organic solvent to obtain a slurry of 3% to 7% cellulose by weight;
b) pressing the slurry obtained in step (a) to obtain a cellulose cake containing 30%, to 65% cellulose by weight;
c) shredding the cellulose cake obtained in step (b) and mixing the shredded cellulose cake and anti-oxidant with 76% to 88% aqueous organic solvent to prepare a homogeneous slurry containing 9% to 20% cellulose by weight;
and
d) heating the homogeneous slurry obtained in step (c) at a temperature of 90 to 120 degree Celsius under vacuum to obtain cellulose dope containing 11% to 20% cellulose by weight.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/679,334Filed 17 Aug 2017

Priority

IN 20162102108720 Jun 2016

Published

21 Dec 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

C08B 1/003
Preparatory treatment of cellulose for making derivatives thereof , e.g. pre-treatment, pre-soaking, activation: preparation of cellulose…
C07C 69/88
Of monocyclic hydroxy carboxylic acids, the hydroxy groups and the carboxyl groups of which are bound to carbon atoms of a six-membered aromatic…
D01F 2/02
Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof: from solutions of cellulose in acids,…
C07D 233/54
Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings: having two double bonds between…

Method for preparing cellulose dope

Life of this patent

Method for preparing cellulose dope

Life of this patent

Abstract

Claims10