HIGH-PRESSURE STRIPPING COLUMNS FOR USE IN INSTALLATIONS FOR MANUFACTURE OF CARBAMIDE Russian patent published in 2024 - IPC B01J19/24 F28D7/16 F28F9/22 B01J19/00 C07C273/04 F28F13/06 C07C273/14 C01B21/12 

FIELD: chemistry.

SUBSTANCE: present inventions relate to production of carbamide, specifically to a high-pressure stripping column for decomposing carbamate and stripping ammonia in carbamide-carbamate mixtures (CCM), a system for producing carbamide, a stripping method and use of a heat carrier distributor and a stripping column. Shell-tubular stripping column (STSC) (100) for stripping of CCM has upper end (110) in connection with possibility of fluid medium transfer with lower end (120) through multiple pipes (150) located inside shell (160). Upper end (110) comprises inlet (111) for CCM and outlet (112) for gas mixture containing stripping gas and one or more stripped compounds. Lower end (120) comprises outlet (122) for carbamide-concentrated CCM, wherein lower end (120), optionally comprising stripping gas inlet (121). STSC additionally comprises heating fluid (HF) inlet (131) and outlet (133) of HF in connection, with possibility of transfer of fluid medium with space (130) on shell side, located between plurality of pipes (150) and shell (160). STSC has a longitudinal direction and side cross-sections, wherein the longitudinal direction is parallel to the pipes, and lateral cross-sections are perpendicular to the longitudinal direction, wherein the STSC comprises distributor (170) of the HF near inlet (131) of the HF for homogenizing the flow of HF in the STSC, wherein distributor (170) of the LF comprises edge wall (171) and distribution plate (175) for HF, wherein the angle between the longitudinal direction and distribution plate (175) for HF is from 85.0° up to 90.0°, and accordingly the angle between the longitudinal direction and edge wall (171) is from 0.0° up to 5.0°. Edge wall (171) defines band-like space (179) between shell (160) and edge wall (171), and wherein edge wall (171) comprises two or more holes and/or a plurality of perforated holes configured to uniformly feed the heating fluid into the inner space for distributing the heating fluid. HF inlet (131) is made with possibility of direct introduction of HF into band-like space (179), wherein band-like space (179) is made with possibility of the HF introduction into the inner space for the HF distribution and distributing plate (175) for HF is made with possibility of introduction of HF from inner space (178) for HF distribution into space (130) on shell side between HF distributor (170) and lower end (120), wherein between distribution plate (175) for HF and edge wall (171) there is space for thermal expansion in terms of thermal expansion. Distributor plate (175) for HF comprises a plurality of perforated holes, a plurality of perforated holes comprises a plurality of pipe openings (176) and a plurality of openings (177) for HF, wherein size and/or density of holes (177) for HF varies in radial direction of distribution plate (175) for HF.

EFFECT: reduced corrosion of pipes and increased efficiency of stripping.

15 cl, 10 dwg, 9 ex