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公开(公告)号：US20160362360A1
公开(公告)日：2016-12-15
申请号：US15246334
申请日：2016-08-24
申请人： Stamicarbon B.V.
IPC分类号： C07C273/04 , B01D5/00 , B01D47/00 , B01J10/00
CPC分类号： C07C273/04 , B01D5/006 , B01D5/009 , B01D47/00 , B01J10/00 , B23P15/26 , Y10T29/49352
摘要： 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.
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公开(公告)号：US20240270685A1
公开(公告)日：2024-08-15
申请号：US18688914
申请日：2023-11-22
申请人： Stamicarbon B.V.
IPC分类号： C07C273/12 , C07D251/60
CPC分类号： C07C273/12 , C07D251/60
摘要： The disclosure pertains to a coupled plant process for the production of urea and melamine, with a urea synthesis section with HP CO2 stripping, and with a part of the CO2 feed supplied to a recovery section.
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公开(公告)号：US20200283377A1
公开(公告)日：2020-09-10
申请号：US16472792
申请日：2018-07-13
申请人： STAMICARBON B.V.
摘要： The invention pertains to a finishing process for urea-comprising material, a plant for finishing urea-comprising material, a method of modifying an existing plant, and a use. Methods are disclosed for preventing the clogging of the conduit for off-gas between the finishing section and the treatment section.
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公开(公告)号：US20170260061A1
公开(公告)日：2017-09-14
申请号：US15528708
申请日：2015-11-26
申请人： Stamicarbon B.V.
CPC分类号： C01C1/185 , B01J10/007 , B01J19/002 , B01J2219/00024 , B01J2219/0004 , C05C1/00 , C05C9/00
摘要： The invention provides a method and a plant for producing urea ammonium nitrate (UAN). The method involves the use of a condensation section, optionally in combination with a medium pressure decomposition section, between the dissociation and neutralization sections. The invention further provides a method of modifying an existing UAN plant. The advantages of the process of the invention are that the emission of CO2 can be reduced, the plant capacity can be increased and the high capital expenditure needed for CO2 compression equipment is reduced.
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公开(公告)号：US20170204054A1
公开(公告)日：2017-07-20
申请号：US15326434
申请日：2015-07-16
申请人： Stamicarbon B.V.
IPC分类号： C07C273/16 , B01D21/26 , B01D9/00
CPC分类号： C07C273/16 , B01D9/0022 , B01D21/262 , C07C275/02
摘要： Disclosed is a process for the preparation of a urea product suitable for being diluted with water so as to form an aqueous urea comprising solution for use in a unit for the reduction of NOx in combustion engine exhaust gases, also known as Diesel Exhaust Fluid (DEF) or to be used in De NOx systems of exhaust vapor from industrial furnaces. The process comprises obtaining an aqueous urea solution from or after a recovery section in a urea production process. This solution, which has a low content of impurities, is subjected to flash crystallization at a low pressure, so as to obtain a solid crystallized urea containing product, which is a free-flowing powder containing less than 0.2 wt. % water. This product is packaged under conditions such that the water content in the packaged product is maintained below 0.2 wt. %. The invention can also be used in a method of increasing the capacity of an existing urea plant.
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公开(公告)号：US20210331086A1
公开(公告)日：2021-10-28
申请号：US17368924
申请日：2021-07-07
申请人： STAMICARBON B.V.
IPC分类号： B01D3/00 , C01C1/18 , C05C9/00 , C07C273/04 , C05C1/00 , C07C273/02 , C05G5/23 , B01J19/24 , B01J19/00 , C07C273/10 , C07C275/02
摘要： Disclosed is a method for the integrated production of two different urea products. One is an aqueous urea solution suitable for use in NOx abatement (generally indicated as Diesel Exhaust Fluid DEF). The other is a solution used as a fertilizer, viz. Urea Ammonium Nitrate (UAN). The production of DEF and UAN are integrated as follows: ammonia recovered from the production of urea is used as a feed to the production of ammonium nitrate. At least part of an aqueous urea stream from urea production, is mixed with ammonium nitrate so as to obtain UAN.
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公开(公告)号：US20190015811A1
公开(公告)日：2019-01-17
申请号：US15576214
申请日：2017-03-30
申请人： STAMICARBON B.V.
IPC分类号： B01J19/18 , B01D5/00 , C07C273/04 , C07C275/02
CPC分类号： B01J19/1837 , B01D3/06 , B01D3/14 , B01D5/006 , B01D2257/406 , B01D2257/504 , B01J19/24 , B01J2219/00006 , B01J2219/00018 , B01J2219/00024 , B01J2219/00038 , B01J2219/0004 , B01J2219/00051 , B01J2219/00087 , B01J2219/00092 , B01J2219/00162 , C07C273/04 , C07C275/02 , Y02P20/582
摘要： Disclosed is a urea plant wherein, in deviation from conventional plants, a high-pressure synthesis section is operated with two different pressures. The synthesis section comprises a reactor, which is operated under a first high pressure. The synthesis section also comprises a stripper and a condenser, both operated at substantially the same second high pressure. In accordance with the invention, the first pressure is substantially higher than the second pressure. The disclosed plant particularly comprises a compression unit capable of converting a pressure difference into work, or more specifically, mechanical energy for compression. This compression unit is positioned between a liquid outlet of the condenser and a liquid inlet of the reactor, and in fluid communication therewith. In order to make use of a pressure drop (expansion as a result of a liquid being depressurized), said compression unit is configured to obtain compression energy from one or more events in the urea production process (i.e., at one or more points in the urea production plant), at which a loss of energy occurs, such as decompression of a high energy stream. Typically, the compression unit is thereby configured to utilize mechanical energy recovered from a decompression unit positioned downstream of the stripper and upstream of the recovery section.
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公开(公告)号：US20180099926A1
公开(公告)日：2018-04-12
申请号：US15568795
申请日：2016-04-25
申请人： Stamicarbon B.V.
IPC分类号： C07C273/12 , C07D251/60 , B01J19/24
CPC分类号： C07C273/12 , B01J19/245 , B01J2219/00024 , B01J2219/24 , C07D251/60 , C07D251/62 , Y02P20/125
摘要： Disclosed is an integrated process for the production of urea and melamine, as well as a system for carrying out the process. The invention thereby pertains to an integrated process of the type wherein off-gas obtained from the production of melamine is entered into the process for the production of melamine, by condensation in the presence of water. A typical embodiment thereof is the condensation in the presence of an aqueous carbamate solution obtained from urea recovery. In accordance with the invention, said condensation takes place at a substantially lower pressure than the pressure at which the melamine off-gas is obtained. To this end, the pressure of the off-gas is reduced typically by 2-10 bar. In connection herewith, the system of the invention comprises a pressure reducing unit downstream of an outlet for the melamine off-gas, and upstream of a section for the condensation of the off-gas. The invention also includes a method for the modernization of an integrated system for the production of melamine and urea. This is accomplished by adding the aforementioned pressure reducing unit to a pre-existing system.
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公开(公告)号：US20180071653A1
公开(公告)日：2018-03-15
申请号：US15560460
申请日：2016-03-29
申请人： Stamicarbon B.V.
IPC分类号： B01D3/00 , C01C1/18 , C07C273/04 , C07C273/10 , C07C275/02 , C05G3/00 , C05C1/00 , C05C9/00 , B01J19/00
CPC分类号： B01D3/009 , B01D3/00 , B01J19/002 , C01C1/185 , C05C1/00 , C05C9/00 , C05G3/0076 , C07C273/02 , C07C273/04 , C07C273/10 , C07C275/02 , Y02P20/127 , C05C9/005
摘要： Disclosed is a method for the integrated production of two different urea products. One is an aqueous urea solution suitable for use in NOx abatement (generally indicated as Diesel Exhaust Fluid—DEF). The other is a solution used as a fertilizer, viz. Urea Ammonium Nitrate (UAN). The production of DEF and UAN are integrated as follows: ammonia recovered from the production of urea is used as a feed to the production of ammonium nitrate. At least part of an aqueous urea stream from urea prodution, is mixed with ammonium nitrate so as to obtain UAN.
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公开(公告)号：US20170362188A1
公开(公告)日：2017-12-21
申请号：US15692715
申请日：2017-08-31
申请人： Stamicarbon B.V.
IPC分类号： C07D251/60 , B01J19/24 , C07C273/12
CPC分类号： C07D251/60 , B01J19/245 , B01J2219/00103 , B01J2219/24 , C07C273/12 , C07D251/62
摘要： 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.
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