PROCESS FOR THE PREPARATION OF 1,3-PROPANEDIOL

摘要

The process is based on the hydration of acrolein in the presence of a chelate-forming ion exchanger resin based on polystyrene/divinylbenzene as a catalyst and the subsequent hydrogenation of the 3-hydroxypropionaldehyde-containing reaction mixture which is freed of unreacted acrolein. Owing to the use of chelate-forming ion exchangers containing anchor groups, of the general formula …… in which Z = H, C1-C6-alkyl, -CH2-CH(CH3)-Y' or -(CH2)o-Y' and Y and/or Y' = -COOH, -OH, pyridyl or -P-(O)(CH2OH)OH, the hydration proceeds at lower temperatures with a higher space-time yield and in particular a higher selectivity than when using previously known ion exchangers. Particularly suitable resins are those containing methyleneimino diacetic acid anchor groups in the H form or partially doped with alkali metal, alkaline earth metal or earth metal ions.