24368-15-8Relevant articles and documents
PROCESS FOR PREPARING CYCLIC ALKYLENE UREAS
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Page/Page column 14-15, (2019/02/25)
A process for producing a cyclic alkylene urea product of Formula I: in which a compound of Formula II and/or Formula III is contacted in a reaction zone with a compound of Formula IV and/or Formula V and in the presence of one or more carbonyl delivering compounds; in which; R1 is –[A?X?]qR3; R2 is on each occurrence independently selected from H and C1 to C6 alkyl groups which are optionally substituted by one or two groups selected from ?OH and ?NH2; R3 is on each occurrence independently selected from H and C1 to C6 alkyl groups which are optionally substituted by one or two groups selected from ?OH and ?NH2; A is on each occurrence independently selected from C1 to C3 alkylene units, optionally substituted by one or more C1 to C3 alkyl groups; X is on each occurrence independently selected from ?O?, ?NR2?, groups of Formula VI, and groups of Formula VII and p and q are each independently selected from a whole number in the range of from 0 to 8; wherein the compound of Formula II and/or the compound of Formula III are added to a reaction zone comprising compound of Formula IV and/or compound of Formula (V) continuously or semi-continuously over a period of time, or in two or more batches.
PROCESS TO CONVERT THE CYCLIC MONOUREA OF AN ETHYLENE AMINE COMPOUND INTO THE ETHYLENE AMINE COMPOUND
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Page/Page column 9-10, (2019/02/25)
The present invention relates to a process to convert the cyclic monourea of ethylene amine compounds (U-EA) into ethylene amine compound (EA) by performing a reactive separation step using a reaction mixture containing the cyclic monourea, wherein one cyclic monourea (U-EA) reacts with another cyclic monourea (U-EA) to transfer its urea unit thereto and the obtained ethylene amine compound (EA) without urea unit is separated from the reaction mixture.
PROCESS FOR MANUFACTURING A CYCLIC UREA ADDUCT OF AN ETHYLENEAMINE COMPOUND
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Page/Page column 23-25, (2019/02/25)
The invention pertains to a process for manufacturing a cyclic urea adduct of an ethyleneamine compound, the ethyleneamine compound having a linear -NH-CH2-CH2-NH- group, the process comprising the steps of - in an absorption step contacting a liquid medium comprising an ethyleneamine compound having a linear -NH-CH2-CH2-NH- group with a CO2-containing gas stream at a pressure of 1 -20 bara, resulting in the formation of a liquid medium into which CO2 has been absorbed, - bringing the liquid medium to cyclic urea formation conditions, and in an urea formation step forming cyclic urea adduct of the ethyleneamine compound, urea formation conditions including a temperature of at least 120°C, wherein the total pressure at the end of the urea formation step is at most 20 bara, wherein the temperature in the absorption step is lower than the temperature in the urea formation step. It has been found that the process according to the invention makes it possible to obtain cyclic urea adducts in an efficient manner in the absence of metal-containing catalysts and to perform the process under relatively mild conditions, in particular relatively low pressure. More specifically, by separating the CO2 absorption step from the urea formation step, the CO2 absorption step can be carried out at relatively low temperatures and pressures. And because the CO2 is already present in the system at the beginning of the urea formation step, the pressure in the urea formation step does not need to be high.
