MULTISTAGE METHOD FOR CONVERSION OF CYCLIC ALKYLENE-UREA COMPOUNDS INTO CORRESPONDING ALKYLENAMINES Russian patent published in 2022 - IPC C07C209/62 C07C211/14 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for conversion of raw materials containing cyclic alkylene-urea compounds into corresponding alkylenamines. The method includes a CO₂ removal stage, at which cyclic alkylene-urea compounds are converted into corresponding alkylenamines by reaction of cyclic alkylene-urea compounds in a liquid phase with water with CO₂ removal, and an amine removal stage, at which cyclic alkylene-urea compounds are converted in the process of reaction separation into corresponding alkylenamines as a result of a reaction with an amine compound selected from a group of primary amines or secondary amines having a higher boiling point than alkylenamines formed in the process. In this case, the CO₂ removal stage is carried out at a temperature of at least 150°C. Cyclic alkylene-urea, which is subjected to conversion to obtain corresponding alkylenamine, is the following. In formulas, R₁ is selected from a hydrogen group, an alkylenamine group of the formula X-R₃-(NH-R₃-)_p-, or an alkoxy group of the formula X-R₃-(O-R₃-)_n-, or a group combining such alkylenamine and alkoxy links for p and n times, wherein one or more links ~N-R₃-N~ may be present in the form of one of following rings, R₂ is hydrogen, X is hydroxyl, amine, linear or branched C1-C20 hydroxyalkyl or C1-C20 aminoalkyl group optionally containing one or more piperazine or alkylene-urea groups, where n and p independently have a value of at least 1, or, when p or n are equal to 0, is C1-C20 hydroxyalkyl or C1-C20 aminoalkyl group, while each R₃ is independently alkylene or substituted alkylene.

EFFECT: proposed method allows for efficient conversion of alkylene-urea compounds into corresponding amines with a high reaction rate.

15 cl, 2 dwg, 7 tbl, 5 ex