公开(公告)号：US3932491A

公开(公告)日：1976-01-13

申请号：US459237

申请日：1974-04-08

申请人： Geertrudes H. Suverkropp

发明人： Geertrudes H. Suverkropp

IPC分类号： C07C227/34 ,  C07B57/00 ,  C07C227/36 ,  C07C229/26 ,  C07C143/58

CPC分类号： C07B57/00

摘要： Optical resolution of lysine in the form of racemic lysine sulphanilate is enhanced by the addition to the supersaturated solution of racemic lysine sulphanilate of one or more substances which suppress the formation of seeds of racemic lysine sulphanilate in the supersatured solution. Among the seed-suppressing substances which may be added are lysine, lysine acetate, lysine carbonate, amino acetic acid and glycerol. The yield of optically active lysine sulphanilate is improved according to the disclosed process.

摘要翻译： 外消旋赖氨酸磺酸盐形式的赖氨酸的光学拆分通过加入一种或多种物质的外消旋赖氨酸磺酸盐的过饱和溶液来增强，这些物质抑制了超临界溶液中外消旋赖氨酸磺酸盐的种子形成。 可以添加的种子抑制物质是赖氨酸，赖氨酸乙酸酯，赖氨酸碳酸酯，氨基乙酸和甘油。 根据公开的方法，光学活性的赖氨酸磺酸盐的产率得到改善。

公开(公告)号：US20240279164A1

公开(公告)日：2024-08-22

申请号：US18609819

申请日：2024-03-19

申请人： Stamicarbon B.V.

发明人： Wilhelmus Hubertus GEURTS

IPC分类号： C07C273/04 ,  B01D5/00 ,  B01J3/02 ,  B01J3/04

CPC分类号： C07C273/04 ,  B01D5/0075 ,  B01J3/02 ,  B01J3/042

摘要： The disclosure pertains to a urea production plant and process using a thermal stripper, wherein the reaction mixture is separated in two parts, wherein the first part is supplied at least in part to the thermal stripper and the second part at least in part bypasses the thermal stripper and is supplied to a medium pressure recovery section.

公开(公告)号：US20240270684A1

公开(公告)日：2024-08-15

申请号：US18553330

申请日：2023-07-06

申请人： Stamicarbon B.V.

发明人： Ahmed ABDELMAGID ,  Wilhelmus Hubertus GEURTS

IPC分类号： C07C273/12 ,  C07C273/04 ,  C07C273/16 ,  C07D251/60 ,  C07D251/62

CPC分类号： C07C273/12 ,  C07C273/04 ,  C07C273/16 ,  C07D251/60 ,  C07D251/62

摘要： The disclosure pertains to a process for the production of urea and melamine, wherein off-has from a high pressure melamine plant is combined with a urea liquid obtained from flashing of a urea synthesis solution. Also disclosed is a system for the combined production, and the modification of an existing plant or system.

公开(公告)号：US20240059623A1

公开(公告)日：2024-02-22

申请号：US18256554

申请日：2023-02-14

申请人： STAMICARBON B.V.

发明人： Johan Albert Arno VAN DEN TILLAART ,  Eelco MOSTERT

IPC分类号： C05C9/00 ,  C05G5/23 ,  C07C273/04 ,  C07C273/16

CPC分类号： C05C9/00 ,  C05G5/23 ,  C07C273/04 ,  C07C273/16

摘要： A urea plant and urea production process of the stripping type are provided that are adapted for making Diesel Exhaust Fluid (DEF) or precursor thereof in a DEF production unit downstream of a treatment section. The treatment section receives a part of the urea synthesis stream from a reaction zone, in particular bypassing the HP stripper.

公开(公告)号：US20240035135A1

公开(公告)日：2024-02-01

申请号：US18481659

申请日：2023-10-05

申请人： Stamicarbon B.V.

发明人： Daniel GULLBERG ,  Christina HARALDSSON ,  Anders WILSON ,  Alexander Aleida Antonius SCHEERDER ,  Kirk Anguah OFEI

IPC分类号： C22C38/58 ,  B01J19/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  F28F21/08 ,  C21D9/08 ,  C21D8/00 ,  C22C33/04 ,  C07C273/04 ,  C21D6/00 ,  B01D1/06 ,  B01D3/32 ,  C22C1/02 ,  C22C38/42

CPC分类号： C22C38/58 ,  B01J19/02 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  F28F21/083 ,  C21D9/08 ,  C21D8/005 ,  C22C33/04 ,  C07C273/04 ,  C21D6/004 ,  B01D1/06 ,  C22C38/004 ,  B01D3/32 ,  C22C1/02 ,  C22C38/42 ,  C21D2211/001 ,  C21D2211/005 ,  B01J2219/0286 ,  Y02P10/122

摘要： The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy) which is suitable for use in a plant for the production of urea; and uses thereof. The disclosure also relates to objects made of said duplex stainless steel. Furthermore, the present disclosure also relates to a method for the production of urea and to a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and to a method of modifying an existing plant for the production of urea.

公开(公告)号：US20230382849A1

公开(公告)日：2023-11-30

申请号：US18447469

申请日：2023-08-10

申请人： STAMICARBON B.V.

发明人： Wilhelmus Hubertus GEURTS

IPC分类号： C07C273/04 ,  B01D5/00 ,  B01J3/02 ,  B01J3/04

CPC分类号： C07C273/04 ,  B01D5/0075 ,  B01J3/02 ,  B01J3/042

摘要： The disclosure pertains to a urea production plant and process using a thermal stripper, wherein the reaction mixture is separated in two parts, wherein the first part is supplied at least in part to the thermal stripper and the second part at least in part bypasses the thermal stripper and is supplied to a medium pressure recovery section.

公开(公告)号：US20230227402A1

公开(公告)日：2023-07-20

申请号：US18006046

申请日：2022-06-10

申请人： STAMICARBON B.V.

发明人： Josef CHROUST ,  Wilhelmus Hubertus GEURTS

IPC分类号： C07C273/04 ,  B01J19/00 ,  B01D3/00 ,  B01D5/00 ,  B01D19/00

CPC分类号： C07C273/04 ,  B01D3/009 ,  B01D5/0003 ,  B01D5/0039 ,  B01D5/0057 ,  B01D19/0036 ,  B01J19/002 ,  B01J2219/00024 ,  B01J2219/00245

摘要： The disclosure pertains to a urea production plant and process using a high-pressure CO2 stripper, downstream medium-pressure treatment unit and a medium-pressure dissociator receiving urea synthesis solution from the reactor, wherein gas from the treatment unit and dissociator are condensed in a first condenser and off-gas from the synthesis section is condensed separately in a second condenser. A revamping method is also described.

公开(公告)号：US20220274916A1

公开(公告)日：2022-09-01

申请号：US17636257

申请日：2021-06-23

申请人： STAMICARBON B.V.

发明人： Wilhelmus Hubertus GEURTS

IPC分类号： C07C273/04 ,  B01J3/04 ,  B01J3/02 ,  B01D5/00

摘要： The disclosure pertains to an urea production plant and process using a thermal stripper, wherein the reaction mixture is separated in two parts, wherein the first part is supplied at least in part to the thermal stripper and the second part at least in part bypasses the thermal stripper and is supplied to a medium pressure recovery section.

公开(公告)号：US20220249975A1

公开(公告)日：2022-08-11

申请号：US17724085

申请日：2022-04-19

申请人： STAMICARBON B.V.

发明人： Dorin POPA

IPC分类号： B01D5/00 ,  B01J10/00 ,  C07C273/04 ,  C07C273/14 ,  F28D7/06 ,  F28F9/02

摘要： Described are a high pressure carbamate condenser, urea plant, and urea production process. The high pressure carbamate condenser as described is of the shell-and-tube heat exchanger type with a tube bundle and has a redistribution chamber connected to tubes of the tube bundle and to a duct. The duct extends between the redistribution chamber and the shell.

公开(公告)号：US20220184545A1

公开(公告)日：2022-06-16

申请号：US17684716

申请日：2022-03-02

申请人： Stamicarbon B.V.

发明人： Brian Sayre HIGGINS

IPC分类号： B01D47/12 ,  B01D47/10 ,  B01D47/06 ,  C07C273/16 ,  B01D47/05 ,  B03C3/013

摘要： Disclosed is a method for the removal of soluble particulate matter from a gas stream, such as urea dust from the off-gas of a finishing section of a urea production plant. The method comprises subjecting the off-gas to at least two quenching stages an aqueous quenching liquid. The quenching liquid used in a first, upstream quench stage, is allowed to have a higher concentration of dissolved particulate matter than the quenching liquid in the second, downstream quench stage. The quenched gas is led through a particle capture zone, typically comprising one or more of a wet scrubber, a Venturi scrubber, and a wet electrostatic precipitator.