公开(公告)号：US11643387B2

公开(公告)日：2023-05-09

申请号：US17628124

申请日：2020-06-09

申请人： Casale SA

发明人： Leonardo Marrone ,  Paolo Bertini

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

CPC分类号： C07C273/04 ,  B01J3/04 ,  B01J19/2445 ,  C07D251/60 ,  Y02P20/582

摘要： A process for synthesis of urea from ammonia and carbon dioxide comprising the synthesis of urea in parallel in a first urea reactor (1) at a first urea synthesis pressure and in a second urea reactor (2) at a second and lower urea synthesis pressure; a stripping step of the reaction effluent of the first reactor, which is performed in a stripper (4) operating at a stripping pressure lower than the first urea synthesis pressure; the reaction effluent (21) of the second reactor (2) and the stripper liquid effluent (11) are sent to a recovery section (13) where a carbamate-containing recycle solution (17) is produced, and said recycle solution (17) is sent partly to said first reactor and partly to said second reactor.

公开(公告)号：US20220395798A1

公开(公告)日：2022-12-15

申请号：US17624518

申请日：2020-06-09

申请人： Casale SA

发明人： Mario Dente ,  Leonardo Marrone ,  Federico Maffietti

IPC分类号： B01J19/00 ,  C07C273/04 ,  B01J3/04 ,  B01J19/24

摘要： A reactor for the synthesis of urea comprising a vertical shell and perforated baffles or trays (3) arranged to define compartments of the reactor, wherein each baffle comprises an array of individual perforated tiles (10) wherein each tile (101) comprises side walls (101A-101D) and a top face (101F), the side walls having first perforations for the liquid and said top face having second perforations for the gas, wherein said second perforations are smaller than said first perforations, and the tiles are distributed over the baffle with a two-dimensional pattern where adjacent tiles are separated by gaps (17).

公开(公告)号：US20220251033A1

公开(公告)日：2022-08-11

申请号：US17628124

申请日：2020-06-09

申请人： Casale SA

发明人： Leonardo Marrone ,  Paolo Bertini

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

摘要： A process for synthesis of urea from ammonia and carbon dioxide comprising the synthesis of urea in parallel in a first urea reactor (1) at a first urea synthesis pressure and in a second urea reactor (2) at a second and lower urea synthesis pressure; a stripping step of the reaction effluent of the first reactor, which is performed in a stripper (4) operating at a stripping pressure lower than the first urea synthesis pressure; the reaction effluent (21) of the second reactor (2) and the stripper liquid effluent (11) are sent to a recovery section (13) where a carbamate-containing recycle solution (17) is produced, and said recycle solution (17) is sent partly to said first reactor and partly to said second reactor.

公开(公告)号：US20210395190A1

公开(公告)日：2021-12-23

申请号：US17287895

申请日：2019-11-07

申请人： Casale SA

发明人： Leonardo Marrone

IPC分类号： C07C273/16 ,  B01J19/24 ,  C07C273/04 ,  B01D1/22 ,  B01D9/00

摘要： A process for synthesis of urea from CO2 and NH3 wherein a steam flow (13) produced in the condenser (3) of a high-pressure synthesis loop is compressed to raise its pressure and temperature before using the steam as a heat source for a downstream step of the process.