公开(公告)号：ES2179801T3

公开(公告)日：2003-02-01

申请号：ES00111932

申请日：2000-06-15

Applicant: BASF AG

Inventor： KRAMER ANDREAS DR ,  MELDER JOHANN-PETER DR ,  RUTTER HEINZ DR ,  RIEWE GUNTER ,  SIEGEL WOLFGANG DR ,  WEYER HANS-JURGEN DR

IPC: C07D233/32 ,  C07D233/34 ,  C07D239/10

Abstract: Formic acid-free N-alkyl-N'-methyl-alkylene ureas (I) are obtained from reaction mixtures obtained from the corresponding alkylene urea (II) and formaldehyde in presence of formic acid by supplying the mixture to the upper part of a distillation column, carrying out distillation under specific pressure and temperature conditions and recovering HCOOH-free (I) from the lower part of the column. Preparation of formic acid-free N-alkyl-N'-methyl-alkylene ureas of formula (I), by reacting the corresponding alkylene urea of formula (II) with monomeric or polymerized formaldehyde (HCHO) in presence of formic acid (HCOOH), involves supplying the reaction mixture containing (I) and HCOOH to the upper part of a distillation column, carrying out distillation without further additives and recovering HCOOH-free (I) from the lower part of the column. The pressure is in the upper part of the column is higher than that in the lower part by 10-100 (preferably 20-40) mbars and the temperature in the lower part of the column is higher than that in the upper part by 40-210 (preferably 80-150) degrees C. R1 = H or Me; R2 = H or 1-4C alkyl; x = 0 or 1.