Process for the production of low color 2,3-epoxypropyl...

C - Chemistry – Metallurgy – 07 – D

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Details

C07D 301/32 (2006.01) C07D 303/36 (2006.01) C08B 31/12 (2006.01) D06M 13/385 (2006.01)

Patent

CA 2339956

An aqueous solution of 2,3-Epoxypropyltrimethylammonium chloride having reduced color and method of preparation are disclosed. 2,3- Epoxypropyltrimethylammonium chloride is treated with sodium hypochlorite to reduce its color. 2-3-Epoxypropyltrimethylammonium chloride can be prepared via reaction of trimethylamine and epichlorohydrin. If desired, an aprotic solvent can be used. 2-3-Epoxypropyltrimethylammonium chloride formed in the resultant slurry, must then be isolated via known methods, such as evaporation, extraction, centrifugation, etc. depending upon the other constituents of the slurry and the residual epichlorohydrin removed. The final product is then treated with an effective amount of sodium hypochlorite. The obtained 2-3-Epoxypropyltrimethylammonium chloride then is used for, for example, color-sensitive applications such as to produce cationic starch for use in paper manufacture.

L'invention concerne une solution aqueuse de chlorure 2,3-époxypropyltriméthylammonium à coloration réduite ainsi que son procédé de préparation. On traite le chlorure 2,3-époxypropyltriméthylammonium avec de l'hypochlorite de sodium pour en réduire la coloration. On peut préparer le chlorure 2,3-époxypropyltriméthylammonium par mise en réaction de triméthylamine avec de l'épichlorohydrine. Si nécessaire, on peut utiliser un solvant aprotique. Puis, on isole le chlorure 2,3-époxypropyltriméthylammonium par des procédés connus, tels que l'évaporation, l'extraction, la centrifugation, etc., en fonction des autres constituants de la suspension et des résidus d'épichlorohydrine. On traite ensuite le produit final avec une quantité effective d'hypochlorite de sodium. Le chlorure 2,3-époxypropyltriméthylammonium obtenu est utilisé, par exemple, pour produire de l'amidon cationique s'utilisant dans la fabrication de papier.

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