摘要:
Alkali metal ions are separated off from alkoxylates containing alkali metal ions by a process comprising: a) dilution of the alkali metal-containing alkoxylate with an inert solvent, b) treatment of the alkali metal-containing solution of the alkoxylate with a cationic exchanger in order to obtain a substantially alkali metal-free solution of the alkoxylate, and c) removal of the solvent from the substantially alkali metal-free solution of the alkoxylate in order to obtain a substantially alkali metal-free and substantially solvent-free alkoxylate.
摘要:
The present invention relates to a process for the continuous preparation of a 1,3-dioxolan-2-one wherein a discharge from the reaction zone is subjected to a fractionation by means of a semipermeable membrane in order to separate off polymeric by-products.