Abstract: 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.

Abstract: The invention provides a process for preparing polyoxyalkylene glycol monoethers and/or diethers by reacting an alkoxide with an alkylating agent, which comprises adding water and a compound of the formula 1 in which R2 is a straight-chain or branched C1- to C20-alkyl radical, p is from 1 to 75, X is one 1,2-alkylene group or different 1,2-alkylene groups having from 2 to 4 carbon atoms, and k is from 1 to 200 to the mixture of alkoxide, alkylating agent and polyoxyalkylene glycol ether which has formed.

Abstract: The invention provides a process for preparing polyoxyalkylene glycol monoethers and/or diethers by reacting an alkoxide with an alkylating agent, which comprises adding water and block polymers which are obtainable from a compound which comprises from 1 to 30 carbon atoms and from 1 to 25 hydroxyl groups, amino groups or both by its blockwise alkoxylation with at least 2 different blocks of in each case from 1 to 200 mol of C2- to C4-alkylene oxide to the mixture of alkoxide, alkylating agent and polyoxyalkylene glycol ether which has formed.

Abstract: The invention provides a process for preparing polyoxyalkylene glycol monoethers and/or diethers by reacting an alkoxide with an alkylating agent, which comprises adding water and oligo- or polyethyleneimines which have been alkoxylated with from 1 to 100 C2- to C4-alkylene oxide groups or a mixture of such alkylene oxide groups per free NH group to the mixture of alkoxide, alkylating agent and polyoxyalkylene glycol ether which has formed.

Abstract: 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 invention is characterized in that the reaction is continuously carried out in a micro reactor.