C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 269/08 (2006.01) C07C 263/04 (2006.01) C07C 265/14 (2006.01) C07C 271/08 (2006.01)
Patent
CA 2209754
The present invention relates to a process for the purification of diurethanes. This process comprises distilling one or more diurethanes corresponding to the general formula: R1 - (NHCOOR2)2 wherein R1: represents a substituted or an unsubstituted aromatic, araliphatic, cycloaliphatic or aliphatic hydrocarbon radical containing from 4 to 10 carbon atoms, wherein suitable substituents comprise alkyl groups containing from 1 to 4 carbon atoms, and R2: represents an alkyl radical containing from 1 to 6 carbon atoms, or a cycloaliphatic hydrocarbon radical containing 5 or 6 carbon atoms; in the presence of low-boiling alcohols at elevated temperatures.
La présente invention concerne un procédé pour la purification de diuréthanes. Ce procédé comprend la distillation d'un ou de plusieurs diuréthanes correspondant à la formule générale : R1 - (NHCOOR2)2 où R1 représente un radical hydrocarboné aromatique, araliphatique, cycloaliphatique ou aliphatique substitué ou non substitué contenant de 4 à 10 atomes de carbone, où les substituants appropriés comprennent les groupes alkyle de 1 à 4 atomes de carbone, et R2 représente un radical alkyle de 1 à 6 atomes de carbone, ou un radical cycloaliphatique hydrocarboné de 5 ou 6 atomes de carbone; en présence d'alcools à faible point d'ébullition à des températures élevées.
Kaltenbacher Erwin
Mendoza-Frohn Christine
Penninger Stefan
Wershofen Stefan
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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