	US 12,258,319 B2
	Process for manufacturing a cyclic urea adduct of an ethyleneamine compound
Rens Veneman, Amersfoort (NL); Antoon Jacob Berend Ten Kate, Arnhem (NL); Karl Fredrik Lake, Södertälje (SE); Jenny Valborg Therese Adrian Meredith, Årsta (SE); Michiel Jozef Thomas Raaijmakers, Deventer (NL); Slavisa Jovic, Utrecht (NL); Rolf Krister Edvinsson, Partille (SE); Hendrik Van Dam, Ede (NL); Eike Nicolas Kantzer, Uddevalla (SE); and Ina Ehlers, Stenungsund (SE)
Assigned to NOURYON CHEMICALS INTERNATIONAL B.V., Arnhem (NL)
Appl. No. 16/638,390
Filed by NOURYON CHEMICALS INTERNATIONAL B.V., Arnhem (NL)
PCT Filed Aug. 7, 2018, PCT No. PCT/EP2018/071320 § 371(c)(1), (2) Date Feb. 11, 2020, PCT Pub. No. WO2019/030191, PCT Pub. Date Feb. 14, 2019.
Claims priority of application No. 17185947 (EP), filed on Aug. 11, 2017.
Prior Publication US 2020/0199077 A1, Jun. 25, 2020
Int. Cl. C07D 233/32 (2006.01); C07D 295/03 (2006.01)

CPC C07D 233/32 (2013.01) [C07D 295/03 (2013.01)]

20 Claims

1. 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 from about 1 to about 20 bara, resulting in the formation of a liquid medium into which CO₂has 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 about 120° C., wherein the total pressure at the end of the urea formation step is at most about 20 bara, and wherein the temperature in the absorption step is lower than the temperature in the urea formation step.