METHOD OF OBTAINING CELLULOSE SOLUTIONS IN WATER-CONTAINING MIXTURE OF TERTIARY AMINEOXIDE

For producing solutions of cellulose in water-containing tertiary amine oxides from a suspension of cellulose in an aqueous solution of the tertiary amine oxide by supplying heat under reduced pressure, the suspension having a viscosity between 50 and 15,000 Pas.sec, measured in a relative system, i...

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Bibliographische Detailangaben
Hauptverfasser:	TSIKELI, SHTEFAN, VOLSHNER, BERND, FIRGO, KHAJNRIKH, YURKOVICH, RAJMUND, AJKHINGER, DITER
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS DERIVATIVES THEREOF GENERAL PROCESSES OF COMPOUNDING MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS METALLURGY MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLYSACCHARIDES SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	For producing solutions of cellulose in water-containing tertiary amine oxides from a suspension of cellulose in an aqueous solution of the tertiary amine oxide by supplying heat under reduced pressure, the suspension having a viscosity between 50 and 15,000 Pas.sec, measured in a relative system, is spread as a layer or film over a heating surface and transported until a homogeneous solution of the cellulose is formed, the feeding of the suspension and the take-off of the homogeneous solution being carried out continuously.; These solutions can be produced in an indirectly heated vessel which is provided with a stirring device and can be evacuated and which is designed as a cylindrical container (2) with a centrally mounted stirrer shaft (7) and stirrer blades (8) attached thereto, the radial distance (13) of the stirrer blades (8) from the inside wall (1) of the container (2) being at most 20 mm, and an inlet (11) for the cellulose suspension being provided in the upper part of the container and an outlet (12) for the homogeneous cellulose solution being provided at the lower end.