C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 1/02 (2006.01) A22C 13/00 (2006.01) B29D 23/00 (2006.01)
Patent
CA 2243651
Disclosed is a method of extruding a solution of cellulose and an amine oxide cellulose solvent as a tube about a sizing mandrel which diametrically stretches the extruded tube. An aqueous PEO solution is introduced into the interior of the extruded tube to facilitate passage of the tube over the sizing mandrel and to extract the amine oxide cellulose solvent from the tube. After such extraction, the aqueous PEO solution containing the extracted amine oxide cellulose solvent is contacted with an anion exchanger to remove the PEO so the amine oxide cellulose solvent can be recovered.
Divulgation d'une méthode d'extrusion d'une solution de cellulose et d'un solvant de cellulose à base d'oxyde d'amine, sous forme de tube sur un mandrin de calibrage qui étire diamétralement le tube extrudé. Une solution aqueuse de PEO est introduite à l'intérieur du tube extrudé pour faciliter le passage du tube sur le mandrin de calibrage et pour extraire du tube le solvant de cellulose à base d'oxyde d'amine. Après cette extraction, la solution aqueuse de PEO contenant le solvant de cellulose à base d'oxyde d'amine est mis en contact avec un échangeur d'anions afin d'éliminer le PEO et de permettre ainsi la récupération du solvant de cellulose à base d'oxyde d'amine.
Sim & Mcburney
Viskase Corporation
LandOfFree
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