Patent ID: 6492528
Filing Date: 2002-12-10
Classification: B01J,C07D

Abstract:
A process for manufacturing 1,3-dialkyl-2-imidazolidinone represented by formula (1): wherein R1 is hydrogen or C1-C6 alkyl and R2 is C1-C6 alkyl, containing 50 ppm by weight or less of 1-alkoxyalkyl-3-alkyl-2-imidazolidinone represented by formula (2): wherein R1 and R2 are as defined above; and R3 is C1-C6 alkylene; or formula (3): wherein R1, R2 and R3 are as defined above; comprising heating at 50Â° C. or higher N-alkylmonoethanolamine represented by formula (9): wherein R1 and R2 are as defined above; with at least one of:i) carbon dioxide and monoalkylamine represented by formula (6): R2NH2â€ƒâ€ƒ(6 ) wherein R2 is as defined above, ii) alkylcarbamate alkylamine salt represented by formula (7): R2NHCOOH.R2NH2â€ƒâ€ƒ(7) wherein R2 is as defined above, and iii) 1,3-dialkylurea represented by formula (8): R2NHCONHR2â€ƒâ€ƒ(8) wherein R2 is as defined above; in a reactor having a surface that contacts at least a part of at least one of the N-alkylmonoethanolamine, the at least one of i), ii) and iii), and the 1,3-dialkyl-2-imidazolidinone is made of (I) a material comprising at least one of titanium, zirconium, titanium oxide or zirconium oxide or (II) inorganic glass.