Preparation of a 1,3-bis-dialkylaminopropanol-2 by electrodialysis of a 1,3-bis-dialkylamino-propanol-2 hydrochloride, useful as intermediates in the preparation of polymers

摘要

Application of the technology of electrodialysis to the an aqueous solution to the hydrochloride of the required product in specific conditions resulting in the compound in non-diluted state and aqueous hydrochloric acid, potentially valorizable. Preparation of a 1,3-bis-dialkylaminopropanol-2 of formula (I) by the use of an electrodialysis cell comprising successively an anode, a primary bipolar membrane, a primary compartment, an anion exchange membrane, a second compartment, a second bipolar membrane and a cathode. The cell is submitted to an electric field perpendicular to the plane of the membranes. An aqueous solution of the hydrochloride of 1,3-bis-dialkylaminopropanol-2, (IIa) and/or (IIb) is treated by electrodialysis in the primary compartment. (both R1 are identical and both R2 are identical; R1, R2 may be identical or different) = Me, Et, Pr, iPr, n-Bu, sec.Bu, or i-Bu.