公开(公告)号：DE10232812A1

公开(公告)日：2004-02-05

申请号：DE10232812

申请日：2002-07-19

Applicant: BASF AG

Inventor： GROPP STEFAN ,  MUELLER PATRIC ,  HEILEK JOERG ,  WEIGL HAGEN

IPC: C07C51/43 ,  C07B63/00 ,  C07B41/08 ,  C07C59/10 ,  C07C59/105

Abstract: A process for the purification of polymethylolalkanoic acids or monomethylolalkanoic acids comprises oxidation of the corresponding alkanal using an aqueous solution of hydrogen peroxide, crystallization followed by a solid-liquid separation whereby following the solid-liquid separation the mother liquor associated with the resulting crystallizate is diluted with a solvent or solvent mixture. A process for the purification of polymethylolalkanoic acids or monomethylolalkanoic acids of formula (1) comprises oxidation of the corresponding alkanal of formula (2) using an aqueous solution of hydrogen peroxide, crystallization followed by a solid-liquid separation whereby following the solid-liquid separation the mother liquor (M1), associated with the resulting crystallizate (FK1) is diluted with a solvent or solvent mixture (L1) such that the dilute mother liquor (M1) is separated to yield the crystallizate (FK2).