Method for producing polyoxymethylene dimethyl ethers

Details Method for producing polyoxymethylene dimethyl ethers Method for producing polyoxymethylene dimethyl ethers

C - Chemistry, Metallurgy

07

C

C07C 41/56 (2006.01) C07C 43/30 (2006.01) C07C 43/303 (2006.01) C08G 2/08 (2006.01)

Patent

CA 2581502

The invention relates to a method for producing a polyoxymethylene dimethyl ether of formula H3CO(CH2O)nCH3, in which n = 2 - 10. According to said method, methylal and trioxane are fed to a reactor and are reacted in the presence of an acidic catalyst. The invention is characterised in that the quantity of water that is introduced into the reaction mixture by means of the methylal, trioxane and/or the catalyst is less than 1 wt. %, in relation to the reaction mixture. Preferably, a fraction containing polyoxymethylene dimethyl ether, where n = 3 and 4, is obtained by distillation and methylal, trioxane and polyoxymethylene dimethyl ether, where n < 3 and optionally n > 4 are fed back to the reaction.

L'invention concerne un procédé pour produire du polyoxyméthylène diméthyléther de formule H3CO(CH2O)nCH3, où n = 2 10. Selon ce procédé, du méthylal et dutrioxane sont mis dans un réacteur à réagir en présence d'un catalyseur acide. L'invention est caractérisée en ce que la quantité d'eau introduite dans le mélange réactionnel par le méthylal, le trioxane et/ou le catalyseur est < 1 % en poids, relativement au mélange réactionnel. Le mélange réactionnel permet d'obtenir par distillation une fraction contenant du polyoxyméthylène diméthyléther où n = 3 et 4, le méthylal, le trioxane et le polyoxyméthylène diméthyléther où n < 3 et éventuellement n > 4 étant réintroduits dans la transformation.

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