公开(公告)号：US11666883B2

公开(公告)日：2023-06-06

申请号：US16964839

申请日：2019-01-14

申请人： Casale SA

发明人： Andrea Scotto ,  Matteo Fumagalli

IPC分类号： B01J19/24 ,  B01J3/03 ,  C07C273/04 ,  C07D251/60

CPC分类号： B01J19/245 ,  B01J3/03 ,  C07C273/04 ,  C07D251/60 ,  B01J2219/0004 ,  B01J2219/00024

摘要： Plant for the synthesis of melamine starting from urea, wherein the stream of offgas containing NH3 and CO2 produced by the synthesis of melamine is converted into urea in a dedicated urea plant.

公开(公告)号：US12012372B2

公开(公告)日：2024-06-18

申请号：US17802101

申请日：2021-02-09

申请人： Casale SA

发明人： Leonardo Marrone ,  Paolo Bertini ,  Matteo Fumagalli

IPC分类号： C07C273/04 ,  B01J19/24

CPC分类号： C07C273/04 ,  B01J19/2465 ,  B01J2219/00162

摘要： A process for synthesis of urea from ammonia and carbon dioxide wherein: the urea synthesis is performed with a stripping process in a synthesis loop including at least a reactor (1), a stripper (2) and a condenser (3); the reactor effluent is treated in the stripper to remove unreacted ammonia and carbon dioxide; the urea solution (14) from the stripper is sent to a low-pressure recovery section (4); the stripper vapours are split into a first portion (151) directed to the reactor and a second portion (152) sent to the condenser; the condenser (3) is a shell-and-tube kettle condenser where condensation of stripper vapours is performed in the tube side (30); a carbamate-containing effluent (20) from the condenser is returned to the reactor.

公开(公告)号：US20230118984A1

公开(公告)日：2023-04-20

申请号：US17802101

申请日：2021-02-09

申请人： Casale SA

发明人： Leonardo Marrone ,  Paolo Bertini ,  Matteo Fumagalli

IPC分类号： C07C273/04 ,  B01J19/24

摘要： A process for synthesis of urea from ammonia and carbon dioxide wherein: the urea synthesis is performed with a stripping process in a synthesis loop including at least a reactor (1), a stripper (2) and a condenser (3); the reactor effluent is treated in the stripper to remove unreacted ammonia and carbon dioxide; the urea solution (14) from the stripper is sent to a low-pressure recovery section (4); the stripper vapours are split into a first portion (151) directed to the reactor and a second portion (152) sent to the condenser; the condenser (3) is a shell-and-tube kettle condenser where condensation of stripper vapours is performed in the tube side (30); a carbamate-containing effluent (20) from the condenser is returned to the reactor.

公开(公告)号：US20210060519A1

公开(公告)日：2021-03-04

申请号：US16964839

申请日：2019-01-14

申请人： Casale SA

发明人： Andrea Scotto ,  Matteo Fumagalli

IPC分类号： B01J19/24 ,  B01J3/03 ,  C07C273/04 ,  C07D251/60

摘要： Plant for the synthesis of melamine starting from urea, wherein the stream of offgas containing NH3 and CO2 produced by the synthesis of melamine is converted into urea in a dedicated urea plant.

公开(公告)号：US12103905B2

公开(公告)日：2024-10-01

申请号：US18282123

申请日：2022-04-05

申请人： Casale SA

发明人： Paolo Bertini ,  Matteo Fumagalli

IPC分类号： C07C273/04 ,  B01J19/00 ,  B01J19/18 ,  C07C273/16

CPC分类号： C07C273/04 ,  B01J19/0013 ,  B01J19/1875 ,  C07C273/16 ,  B01J2219/00024 ,  B01J2219/00092

摘要： Process for the preparation of urea granules comprising the steps of obtaining an aqueous urea solution from one or more synthesis and recovery steps wherein ammonia and carbon dioxide are reacted together, subjecting the aqueous urea solution to an evaporation step wherein water is removed to obtain a urea melt (1), processing and treating said urea melt in a granulation step (7) and optionally in a cooling section (10) to obtain solid urea granules (14); the process further comprises a scrubbing step (3) of granulation offgas and an atmospheric evaporation step (32) to recover a urea solution (2) and a water-saturated air stream (18): the water-saturated air stream is fed back to the scrubbing section (3) without condensation, and the recovered urea solution is conveyed to the granulation step (7).

公开(公告)号：US20240262798A1

公开(公告)日：2024-08-08

申请号：US18577854

申请日：2022-06-30

申请人： Casale SA

发明人： Paolo Bertini ,  Matteo Fumagalli

IPC分类号： C07D251/60 ,  C07C273/04 ,  C07C273/12

CPC分类号： C07D251/60 ,  C07C273/04 ,  C07C273/12

摘要： A process for the synthesis of urea and melamine, wherein urea synthesized in a urea plant is used to produce melamine in a melamine plant connected to the urea plant, according to a high-pressure non-catalytic melamine synthesis process, and offgas (16) liberated during the synthesis of melamine are returned to the urea plant after offgas processing (8) which includes a condensation and a urea formation step so that a urea-containing recycle stream (19) is returned to the synthesis section of the urea plant.

公开(公告)号：US20240217924A1

公开(公告)日：2024-07-04

申请号：US18282123

申请日：2022-04-05

申请人： Casale SA

发明人： Paolo Bertini ,  Matteo Fumagalli

IPC分类号： C07C273/04 ,  B01J19/00 ,  B01J19/18 ,  C07C273/16

CPC分类号： C07C273/04 ,  B01J19/0013 ,  B01J19/1875 ,  C07C273/16 ,  B01J2219/00024 ,  B01J2219/00092

摘要： Process for the preparation of urea granules comprising the steps of obtaining an aqueous urea solution from one or more synthesis and recovery steps wherein ammonia and carbon dioxide are reacted together, subjecting the aqueous urea solution to an evaporation step wherein water is removed to obtain a urea melt (1), processing and treating said urea melt in a granulation step (7) and optionally in a cooling section (10) to obtain solid urea granules (14); the process further comprises a scrubbing step (3) of granulation offgas and an atmospheric evaporation step (32) to recover a urea solution (2) and a water-saturated air stream (18): the water-saturated air stream is fed back to the scrubbing section (3) without condensation, and the recovered urea solution is conveyed to the granulation step (7).

公开(公告)号：US11279671B2

公开(公告)日：2022-03-22

申请号：US16611037

申请日：2018-04-30

申请人： Casale SA

发明人： Paolo Bertini ,  Matteo Fumagalli ,  Serena Gabbiadini

IPC分类号： C07C273/04 ,  C07C273/16

摘要： Plant for the synthesis of urea comprising: a synthesis section (101), wherein ammonia (1) and carbon dioxide (2) react to give an aqueous solution (3) containing urea and ammonium carbamate; at least one recovery section fed with said depressurized aqueous solution and in a two-phase state, said recovery section comprising a separator (104,108) which processes said two-phase solution; a pre-decomposer (105, 109), a decomposer (106, 110) and a condenser (107, 111), wherein the gaseous streams obtained in the separator and in the decomposer are condensed in said condenser of the recovery section.