Method of producing cellulose carbamate

C - Chemistry – Metallurgy – 08 – B

Patent

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C08B 15/06 (2006.01)

Patent

CA 2471366

The invention relates to a method for producing cellulose carbamate by reacting cellulose with urea. The novel method permits a homogeneous temperature distribution in the reaction mixture, without the need for large quantities of suspending agents to be added as heat-transfer media. According to the inventive method, the heat transfer to the reaction mixture is achieved by heating cellulose in the presence of melted or dissolved urea, with the aid of electromagnetic radiation. Methods of this type are used for the production of fibres, films, beads, sponges and other cellulose-based moulded bodies.

La présente invention concerne un procédé pour produire du carbamate de cellulose par mise en réaction de cellulose avec de l'urée. Ce nouveau procédé permet d'obtenir une distribution de températures homogène dans le mélange réactionnel, sans devoir ajouter de grandes quantités d'agents de suspension servant d'agents caloporteurs. Selon ce procédé, le transfert thermique sur le mélange réactionnel est effectué par chauffage de cellulose par rayonnement électromagnétique, en présence d'urée fondue ou dissoute. Les procédés de ce type sont mis en oeuvre pour produire des fibres, des films, des perles, des éponges et d'autres corps moulés à base de cellulose.

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