US20130216449A1 - Urea plant - Google Patents

Urea plant Download PDF

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Publication number
US20130216449A1
US20130216449A1 US13/805,633 US201113805633A US2013216449A1 US 20130216449 A1 US20130216449 A1 US 20130216449A1 US 201113805633 A US201113805633 A US 201113805633A US 2013216449 A1 US2013216449 A1 US 2013216449A1
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US
United States
Prior art keywords
purge
urea plant
urea
plant
plant according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/805,633
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English (en)
Inventor
Luc Louis Maria Dieltjens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stamicarbon BV filed Critical Stamicarbon BV
Assigned to STAMICARBON B.V. reassignment STAMICARBON B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Dieltjens, Luc Louis Maria
Publication of US20130216449A1 publication Critical patent/US20130216449A1/en
Priority to US15/669,818 priority Critical patent/US10384184B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J12/00—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor
    • B01J12/005—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor carried out at high temperatures, e.g. by pyrolysis
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/04—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds from carbon dioxide and ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J12/00—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

Definitions

  • urea (NH 2 CONH 2 ) is produced by reacting ammonia (NH 3 ) and carbon dioxide (CO 2 ) at elevated temperature and pressure according to the reactions:
  • the invention relates to a urea plant comprising synthesis equipment, synthesis piping, a CO 2 and a NH 3 feed, and a purge stream.
  • a purge stream part of, or all inert gases that are present in the CO 2 and NH 3 feed, as well as part, or all, of any other inert gases fed to the urea plant are released from the urea plant.
  • Inert gases in this context are defined as any gaseous components that do not contribute to the chemical production of urea.
  • Both feedstocks are usually originating from an ammonia plant.
  • ammonia plant is a net heat producer and a urea plant is a net heat (steam) consumer, and it is normal practice to integrate the steam systems of both plants, net heat is required, which is generally obtained from burning fuel.
  • the fuel consumption can be reduced by 2%, which for an average urea/ammonia complex corresponds with a saving of about 7 ⁇ 10 6 kg natural gas/year.
  • the NH3 feed typically comprises also minor amounts of CH4.
  • Methane (CH 4 ) contributes to the growing global background concentration of tropospheric ozone (O 3 ), an air pollutant associated with premature mortality. Methane and ozone are also important greenhouse gases.
  • a further advantage of the invention is that methane emissions of the urea plant are reduced, which decreases surface ozone and slowing global climate warming.
  • the CO2 feed is generally provided with an additional oxygen stream, generally originating from air.
  • the oxygen serves as an agent to prevent excessive corrosion of the synthesis equipment and the synthesis piping. As the oxygen does not contribute to the production of urea, it is vented with the purge gas. Excessive corrosion is prevented when the oxygen concentration in the purge gas is in the range of 5-20 mol %
  • the purge stream is very likely to be inflammable even before the addition of an oxidizing agent (e.g. air). Because of this inflammable character of the purge gas stream, it is unsafe to transport this gas (e.g. via pipelines) over some distance. In contrast, it is common practice up to now to vent this purge gas via shortest possible connections into the atmosphere.
  • an oxidizing agent e.g. air
  • Said duplex ferritic-austenitic steel is preferably a duplex, stainless steel alloy that contains, in % by weight: 0-0.05 C; 0-0.8 Si; 0.3-4 Mn; 28-35 Cr; 3-10 Ni; 1.0-4.0 Mo; 0.2-0.6 N; 0-1.0 Cu; 0-2.0 W ; 0-0.010 S; 0-0.2 Ce, the remainder being Fe and normally occurring impurities and additives, the ferrite content being 30-70% by volume.
  • duplex ferritic-austenitic steel allows a reduction of the additional oxygen stream in the CO2 feed such that the oxygen concentration in the purge gas can be reduced to between 0-1 mol %, without the risk of excessive corrosion taking place.
  • oxygen is essentially absent in the purge gas. It is surprising that the purge gas stream, essentially without oxygen, now can be transported (e.g. by pipelines) without associated safety risks, to be used as a fuel gas.
  • the purge line of the urea plant of the invention is connected with a fuel gas input line of a utility plant or an NH3 plant.
  • the purge stream is directed to the reformer section in an ammonia plant, or to the fuel gas supply of a steam boiler.
  • FIG. 1 shows a urea plant ( 1 ) comprising a CO2 feed ( 10 ) and a NH3 feed ( 11 ). Solid urea leaves the plant via line 12 . Water is purged via line 13 . Purge line ( 14 ) is connected with a fuel gas input line of a utility plant or an NH3 plant ( 2 ).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Treating Waste Gases (AREA)
US13/805,633 2010-06-24 2011-06-24 Urea plant Abandoned US20130216449A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/669,818 US10384184B2 (en) 2010-06-24 2017-08-04 Urea plant

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP10167180.8 2010-06-24
EP10167180 2010-06-24
EP10168065.0 2010-07-01
EP10168065A EP2402308A1 (en) 2010-06-24 2010-07-01 Urea plant
PCT/NL2011/050458 WO2011162610A1 (en) 2010-06-24 2011-06-24 Urea plant

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2011/050458 A-371-Of-International WO2011162610A1 (en) 2010-06-24 2011-06-24 Urea plant

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/669,818 Continuation US10384184B2 (en) 2010-06-24 2017-08-04 Urea plant

Publications (1)

Publication Number Publication Date
US20130216449A1 true US20130216449A1 (en) 2013-08-22

Family

ID=44588240

Family Applications (2)

Application Number Title Priority Date Filing Date
US13/805,633 Abandoned US20130216449A1 (en) 2010-06-24 2011-06-24 Urea plant
US15/669,818 Active US10384184B2 (en) 2010-06-24 2017-08-04 Urea plant

Family Applications After (1)

Application Number Title Priority Date Filing Date
US15/669,818 Active US10384184B2 (en) 2010-06-24 2017-08-04 Urea plant

Country Status (12)

Country Link
US (2) US20130216449A1 (ja)
EP (2) EP2402308A1 (ja)
JP (2) JP5923496B2 (ja)
CN (1) CN102985404B (ja)
AR (1) AR081990A1 (ja)
AU (1) AU2011269925B2 (ja)
BR (1) BR112012033106B1 (ja)
CA (1) CA2803270C (ja)
EA (1) EA025924B1 (ja)
EG (1) EG26897A (ja)
PL (1) PL2585434T3 (ja)
WO (1) WO2011162610A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9890114B2 (en) 2013-05-28 2018-02-13 Toyo Engineering Corporation Urea synthesis method

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2402308A1 (en) * 2010-06-24 2012-01-04 DSM IP Assets B.V. Urea plant
CN103438951A (zh) * 2013-09-06 2013-12-11 高正 合金钢耐磨防堵式风量及风速传感器
WO2015099530A1 (en) 2013-12-27 2015-07-02 Stamicarbon B.V. Corrosion resistant duplex steel alloy, objects made thereof, and method of making the alloy
RU2696384C2 (ru) * 2015-04-03 2019-08-01 САИПЕМ С.п.А. Реактор и способ синтеза мочевины
WO2017013181A1 (en) * 2015-07-20 2017-01-26 Sandvik Intellectual Property Ab New use of a duplex stainless steel
ES2793387T3 (es) * 2017-12-22 2020-11-13 Saipem Spa Usos de aceros inoxidables dúplex

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5523483A (en) * 1995-06-16 1996-06-04 The M. W. Kellogg Company Integrated urea/ammonia process
US5582656A (en) * 1993-06-21 1996-12-10 Sandvik Ab Ferritic-austenitic stainless steel

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258486A (en) * 1961-01-23 1966-06-28 Chemical Construction Corp Process for urea synthesis
NL165712C (nl) * 1970-05-30 1981-05-15 Stamicarbon Werkwijze en inrichting voor het bij synthesedruk terug- winnen van ammoniak en kooldioxyde uit het spuigas van een ureumsynthese.
GB1553209A (en) 1975-09-29 1979-09-26 Ici Ltd Zeolites
JPS54151917A (en) * 1978-05-20 1979-11-29 Mitsui Toatsu Chem Inc Elimination of explosiveness of tail gas of urea preparation process
JPS61109760A (ja) 1984-11-02 1986-05-28 Toyo Eng Corp 尿素製造法
IT1232670B (it) * 1989-09-15 1992-03-02 Snam Progetti Procedimento per la purificazione delle acque reflue prodotte dagli impianti di produzione dell'urea.
JP2965101B2 (ja) * 1992-07-31 1999-10-18 株式会社ニデック 眼科装置
JP2000159519A (ja) * 1998-11-25 2000-06-13 Chiyoda Corp アンモニア・尿素製造プラントおよび製造方法
NL1014512C2 (nl) * 2000-02-28 2001-08-29 Dsm Nv Methode voor het lassen van duplex staal.
EP1188710A3 (en) * 2000-09-15 2003-10-29 Haldor Topsoe A/S Process for the integrated preparation of ammonia and urea
CN1243727C (zh) * 2003-12-25 2006-03-01 黑龙江黑化集团有限公司 改进工业生产尿素装置的方法
CN1923344B (zh) * 2004-12-07 2010-06-16 陈妙生 废气净化器
US7642377B1 (en) * 2008-07-21 2010-01-05 Kellogg Brown & Root Llc Systems and methods for integrated ammonia-urea process
EP2402308A1 (en) * 2010-06-24 2012-01-04 DSM IP Assets B.V. Urea plant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582656A (en) * 1993-06-21 1996-12-10 Sandvik Ab Ferritic-austenitic stainless steel
US5523483A (en) * 1995-06-16 1996-06-04 The M. W. Kellogg Company Integrated urea/ammonia process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9890114B2 (en) 2013-05-28 2018-02-13 Toyo Engineering Corporation Urea synthesis method

Also Published As

Publication number Publication date
CN102985404B (zh) 2014-06-18
CA2803270C (en) 2018-04-24
EA025924B1 (ru) 2017-02-28
PL2585434T3 (pl) 2015-02-27
US20170326521A1 (en) 2017-11-16
EP2585434A1 (en) 2013-05-01
WO2011162610A1 (en) 2011-12-29
EP2585434B1 (en) 2014-07-30
EG26897A (en) 2014-12-04
JP5923496B2 (ja) 2016-05-24
BR112012033106A2 (pt) 2020-02-27
JP2013529631A (ja) 2013-07-22
AU2011269925B2 (en) 2015-02-19
CN102985404A (zh) 2013-03-20
EP2402308A1 (en) 2012-01-04
US10384184B2 (en) 2019-08-20
AU2011269925A1 (en) 2013-01-24
CA2803270A1 (en) 2011-12-29
EA201390024A1 (ru) 2013-05-30
JP2016094470A (ja) 2016-05-26
BR112012033106B1 (pt) 2021-01-05
AR081990A1 (es) 2012-10-31

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Legal Events

Date Code Title Description
AS Assignment

Owner name: STAMICARBON B.V., NETHERLANDS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DIELTJENS, LUC LOUIS MARIA;REEL/FRAME:029735/0739

Effective date: 20130114

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION