C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 41/02 (2006.01) C07C 43/10 (2006.01) C07C 43/11 (2006.01)
Patent
CA 2621693
The invention relates to a method for producing alkylene glycol diethers by reacting a linear or cyclic ether with an alkylene oxide in the presence of a Lewis acid. The method is characterized in that the Lewis acid is a mixture of 1 part by weight of HBF4 and/or BF3 and 0.1 to 10 parts by weight of H2SO4, HNO3 and/or H3PO4. The new catalyst system allows to reduce undesired by-products such as e.g. dioxan or dimethyltriethylene glycol, and to increase the quantity of valuable substances such as dimethyl glycol and dimethyl diglycol.
L'invention concerne un procédé de production de diéthers d'alkylèneglycol, qui consiste à faire réagir un éther linéaire ou cyclique avec un oxyde d'alkylène en présence d'un acide de Lewis. Ce procédé se caractérise en ce que l'acide de Lewis est un mélange d'une partie en poids de HBF<SUB>4</SUB> et/ou de BF<SUB>3 </SUB>et de 0,1 à 10 parties en poids de H<SUB>2</SUB>SO<SUB>4</SUB>, de HNO<SUB>3</SUB> et/ou de H<SUB>3</SUB>PO<SUB>4</SUB>. Grâce au nouveau système catalyseur, moins de produits secondaires indésirables, tels que le dioxane ou le diméthyltriéthylèneglycol, et une plus grande proportion des produits de valeur diméthylglycol et diméthyldiglycol sont obtenus.
Oberendfellner Gabriele
Snell Alexander
Clariant Produkte (deutschland) Gmbh
Fetherstonhaugh & Co.
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