公开(公告)号：US10364215B2

公开(公告)日：2019-07-30

申请号：US15685308

申请日：2017-08-24

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen ,  Barbara Cucchiella

IPC: B01J19/24 ,  C07C273/04

Abstract: Disclosed is a method for the production of urea allowing a substantial reduction, even down to zero, of the continuous emission of ammonia conventionally resulting from such a process. According to a preferred embodiment of the invention, the urea-forming reaction from carbon dioxide and ammonia is conducted in a synthesis section that does not require passivation by oxygen. As a result of the absence of oxygen, a hydrogen-rich gas stream results from the synthesis section, that can be used as a fuel in an incinerator. In the incinerator, ammonia-comprising gas streams from the urea production process are combusted.

公开(公告)号：US09981924B2

公开(公告)日：2018-05-29

申请号：US15692715

申请日：2017-08-31

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen

IPC: C07D251/60 ,  C07D251/62 ,  C07C273/12 ,  B01J19/24

CPC classification number: C07D251/60 ,  B01J19/245 ,  B01J2219/00103 ,  B01J2219/24 ,  C07C273/12 ,  C07D251/62

Abstract: Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off-gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.

公开(公告)号：US09890115B2

公开(公告)日：2018-02-13

申请号：US14127962

申请日：2012-10-12

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen

IPC: C07C273/16 ,  C07C273/14 ,  B01J2/22 ,  B01J2/30 ,  B29C43/00 ,  C05C9/02 ,  C05C9/00 ,  B29K75/00

CPC classification number: C07C273/16 ,  B01J2/22 ,  B01J2/30 ,  B29C43/006 ,  B29K2075/02 ,  C05C9/005 ,  C05C9/02 ,  C07C273/14 ,  Y10T29/49716

Abstract: Disclosed is a method for urea finishing. A urea solution is subjected to crystallization and, other than in conventional processes, the urea crystals are shaped by exerting mechanical force onto them. Thus, the conventional prilling or granulation finishing steps can be avoided, and so are the corresponding emissions of ammonia and/or dust. The crystallization comprises a flash crystallization. The invention also pertains to the urea particles obtainable by the process, to a urea plant, and to a method of modifying an existing urea plant.

公开(公告)号：US09458098B2

公开(公告)日：2016-10-04

申请号：US14398433

申请日：2013-05-02

Applicant: STAMICARBON B.V.

Inventor： Johannes Henricus Mennen ,  Jozef Hubert Meessen

IPC: B01D47/00 ,  C07C273/04 ,  B01D5/00 ,  B23P15/26

CPC classification number: C07C273/04 ,  B01D5/006 ,  B01D5/009 ,  B01D47/00 ,  B01J10/00 ,  B23P15/26 ,  Y10T29/49352

Abstract: Disclosed is a plant for the production of urea. The plant comprises conventional sections for synthesis and recovery, for evaporation and condensation, for urea finishing, and for dust scrubbing. According to the invention, an additional evaporation and condensation loop is introduced from and to the dust scrubbing section. This loop results in a more favorable energy consumption of the plant.

Abstract translation: 公开了一种用于生产尿素的设备。 该设备包括用于合成和回收的常规部分，用于蒸发和冷凝，用于尿素整理和用于灰尘洗涤。 根据本发明，从灰尘洗涤部分引入附加的蒸发和冷凝环路。 该循环导致植物更有利的能量消耗。

公开(公告)号：US20150026943A1

公开(公告)日：2015-01-29

申请号：US14127962

申请日：2012-10-12

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen

IPC: C07C273/16 ,  B29C43/00

CPC classification number: C07C273/16 ,  B01J2/22 ,  B01J2/30 ,  B29C43/006 ,  B29K2075/02 ,  C05C9/005 ,  C05C9/02 ,  C07C273/14 ,  Y10T29/49716

Abstract: Disclosed is a method for urea finishing. A urea solution is subjected to crystallization and, other than in conventional processes, the urea crystals are shaped by exerting mechanical force onto them. Thus, the conventional prilling or granulation finishing steps can be avoided, and so are the corresponding emissions of ammonia and/or dust. The crystallization comprises a flash crystallization. The invention also pertains to the urea particles obtainable by the process, to a urea plant, and to a method of modifying an existing urea plant.

Abstract translation: 公开了一种尿素整理方法。 尿素溶液进行结晶，除了常规方法之外，尿素晶体通过对其施加机械力而成形。 因此，可以避免常规的造粒或造粒整理步骤，氨和/或粉尘的相应排放也是如此。 结晶包括闪晶结晶。 本发明还涉及通过该方法获得的尿素颗粒，尿素装置以及改进现有尿素装置的方法。