Process for producing cellulose derivatives

Details Process for producing cellulose derivatives Process for producing cellulose derivatives

C - Chemistry, Metallurgy

08

B

C08B 1/00 (2006.01) C08B 1/06 (2006.01) C08B 1/08 (2006.01) C08B 9/00 (2006.01) C08B 11/00 (2006.01) D01F 2/06 (2006.01)

Patent

CA 2241800

Disclosed is a method for producing cellulose derivatives wherein cellulose is impregnated with an alkali solution, the impregnated cellulose is selectably pressed out, and the cellulose undergoes a substitution or addition reaction, whereby the cellulose derivative is obtained with a degree of substitution DS. The applied cellulose is an ammonia activated cellulose. The molar ratio of the alkali to the AHG (anhydro glucose unit) in the cellulose at the beginning of the substitution or addition reaction does not exceed twice the valve of the desired DS. For the swelling of cellulose, no excess of alkali is required, which does not react to produce alkali cellulose but only adheres to the cellulose as a loose association product. Reagent consumption in the substitution or addition reaction is lower. Fewer secondary products are formed.

L'invention concerne un procédé de production de dérivés de cellulose, selon lequel la cellulose est imprégnée d'une solution alcaline, la cellulose imprégnée est éventuellement exprimée et la cellulose est soumise à une réaction de substitution ou d'addition pour obtenir un dérivé de cellulose avec un degré de substitution DS. La cellulose utilisée est une cellulose activée à l'ammoniac. Le rapport molaire alcali/AHG (unité anhydroglucose) dans la cellulose ne dépasse pas, au début de la réaction de substitution ou d'addition, le double de la valeur du DS désirée. Le gonflement de la cellulose ne nécessite pas d'excès en alcali qui ne réagit pas pour fournir de l'alcali-cellulose mais qui adhère uniquement à la cellulose sous forme de produit associé libre. La consommation en réactif dans la réaction de substitution ou d'addition est plus faible et on obtient moins de sous-produits.

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