WO2009080176A3 - Process for the preparation of melamine - Google Patents

Process for the preparation of melamine Download PDF

Info

Publication number
WO2009080176A3
WO2009080176A3 PCT/EP2008/010073 EP2008010073W WO2009080176A3 WO 2009080176 A3 WO2009080176 A3 WO 2009080176A3 EP 2008010073 W EP2008010073 W EP 2008010073W WO 2009080176 A3 WO2009080176 A3 WO 2009080176A3
Authority
WO
WIPO (PCT)
Prior art keywords
melamine
urea
reaction
preparation
molten
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.)
Ceased
Application number
PCT/EP2008/010073
Other languages
French (fr)
Other versions
WO2009080176A2 (en
WO2009080176A8 (en
Inventor
Tjay Tjien Tijoe
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.)
DSM IP Assets BV
Original Assignee
DSM IP Assets 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 DSM IP Assets BV filed Critical DSM IP Assets BV
Priority to US12/809,303 priority Critical patent/US20110009630A1/en
Priority to EA201070769A priority patent/EA201070769A1/en
Priority to EP08865550A priority patent/EP2222651A2/en
Priority to CN2008801222030A priority patent/CN101903361A/en
Publication of WO2009080176A2 publication Critical patent/WO2009080176A2/en
Publication of WO2009080176A3 publication Critical patent/WO2009080176A3/en
Anticipated expiration legal-status Critical
Publication of WO2009080176A8 publication Critical patent/WO2009080176A8/en
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
    • C07D251/40—Nitrogen atoms
    • C07D251/54—Three nitrogen atoms
    • C07D251/56—Preparation of melamine
    • C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia
    • 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
    • C07C273/12—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 combined with the synthesis of melamine

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Abstract

The present invention relates to a non-catalytic process for the preparation of melamine comprising: a) reacting molten urea in a reaction section at a pressure of 4.5 to 15 MPa to produce a reaction mixture containing molten melamine and reaction off-gases; b) vaporizing the molten melamine in said reaction mixture in a vaporization section to produce a gaseous mixture comprising the vaporized melamine and the reaction off-gases at a pressure of 4.5 to 15 MPa; c) quenching the gaseous mixture obtained from step b) by contact with an aqueous ammonium carbamate solution; and d) isolating melamine; and to a combined process for the preparation of urea and melamine, wherein melamine is prepared in accordance to the above method wherein at least part of the concentrated aqueous ammonium carbamate solution is transferred to an urea plant as at least part of the feed stock, urea is prepared utilizing said concentrated aqueous carbamate solution and urea obtained from said preparation step is supplied in molten form to the reacting step a).
PCT/EP2008/010073 2007-12-20 2008-11-27 Process for the preparation of melamine Ceased WO2009080176A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US12/809,303 US20110009630A1 (en) 2007-12-20 2008-11-27 Process for the preparation of melamine
EA201070769A EA201070769A1 (en) 2007-12-20 2008-11-27 METHOD OF OBTAINING MELAMINE
EP08865550A EP2222651A2 (en) 2007-12-20 2008-11-27 Process for the preparation of melamine
CN2008801222030A CN101903361A (en) 2007-12-20 2008-11-27 The preparation method of melamine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07024777 2007-12-20
EP07024777.0 2007-12-20

Publications (3)

Publication Number Publication Date
WO2009080176A2 WO2009080176A2 (en) 2009-07-02
WO2009080176A3 true WO2009080176A3 (en) 2009-08-20
WO2009080176A8 WO2009080176A8 (en) 2010-07-22

Family

ID=39148746

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/010073 Ceased WO2009080176A2 (en) 2007-12-20 2008-11-27 Process for the preparation of melamine

Country Status (5)

Country Link
US (1) US20110009630A1 (en)
EP (1) EP2222651A2 (en)
CN (1) CN101903361A (en)
EA (1) EA201070769A1 (en)
WO (1) WO2009080176A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973948B (en) * 2010-09-11 2013-03-27 山东省舜天化工集团有限公司 Method for producing melamine
EP3208264A1 (en) 2016-02-19 2017-08-23 Casale SA Method for revamping a high pressure melamine plant
CN110330762A (en) * 2019-07-22 2019-10-15 徐州工程学院 A kind of preparation method of environment-friendly type wood plastic composite forming agent
CN113375133A (en) * 2021-06-23 2021-09-10 四川金象赛瑞化工股份有限公司 High-grade steam production device utilizing melamine production system and method for producing high-grade steam by utilizing high-grade steam production device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001345A1 (en) * 1993-07-01 1995-01-12 Kemira Oy Process for the preparation of melamine
WO2000029393A1 (en) * 1998-11-13 2000-05-25 Agrolinz Melamin Gmbh Method for producing pure melamine
EP1054006A1 (en) * 1999-05-20 2000-11-22 Dsm N.V. Method for preparing melamine
WO2001056999A1 (en) * 2000-02-03 2001-08-09 Dsm N.V. Process for preparing melamine from urea

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1695564A1 (en) * 1966-07-22 1971-05-06 Nissan Chemical Ind Ltd Process for the production of melamine of high purity
NL169181C (en) * 1970-04-03 1982-06-16 Stamicarbon PROCESS FOR SEPARATING MELAMINE FROM A HOT MELAMINE VAPOR, AMMONIA AND CARBON DIOXIDE CONTAINING SYNTHESIS GAS MIX.
US4565867A (en) * 1984-01-05 1986-01-21 Melamine Chemicals, Inc. Anhydrous high-pressure melamine synthesis

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001345A1 (en) * 1993-07-01 1995-01-12 Kemira Oy Process for the preparation of melamine
WO2000029393A1 (en) * 1998-11-13 2000-05-25 Agrolinz Melamin Gmbh Method for producing pure melamine
EP1054006A1 (en) * 1999-05-20 2000-11-22 Dsm N.V. Method for preparing melamine
WO2001056999A1 (en) * 2000-02-03 2001-08-09 Dsm N.V. Process for preparing melamine from urea

Also Published As

Publication number Publication date
EA201070769A1 (en) 2010-12-30
WO2009080176A2 (en) 2009-07-02
CN101903361A (en) 2010-12-01
US20110009630A1 (en) 2011-01-13
WO2009080176A8 (en) 2010-07-22
EP2222651A2 (en) 2010-09-01

Similar Documents

Publication Publication Date Title
WO2009043365A8 (en) Process and plant for urea production
Biswas et al. Catalytic synthesis of benzimidazoles and organic carbamates using a polymer supported zinc catalyst through CO 2 fixation
SG134289A1 (en) Process for the production of di-and polyamines of the diphenylmethane series
WO2010105120A3 (en) Methods and reactor designs for producing phosphorus pentafluoride
WO2009027249A3 (en) Method for producing amines from sugar alcohols
WO2009080176A3 (en) Process for the preparation of melamine
WO2009120862A3 (en) Systems and methods for distributing gas in a chemical vapor deposition reactor
UA93586C2 (en) Integrated process for urea and melamine production and integrated plant
WO2009052152A3 (en) Tigecycline and methods of preparing intermediates
AR086313A1 (en) HIGH PERFORMANCE PROCEDURE FOR UREA SYNTHESIS
MX2012007800A (en) A urea stripping process for the production of urea.
WO2009143979A8 (en) Production of a solids-containing pur spray jet
WO2008062028A3 (en) Integrated method for producing benzene and ammonia from aliphatic hydrocarbons and nitrogen
EP4098356B1 (en) Plant and process for the synthesis of melamine with offgas recovery in a tied-in urea plant
UA85789C2 (en) Process for urea production and related plant
CN106865513B (en) A kind of preparation method of hydrazine hydrate
TW200710095A (en) Process for producing organoalkoxysilanes from organic acids or cyanates and haloalkylalkoxysilanes
BR112019022989A2 (en) process and plant for urea synthesis
CA2473224A1 (en) Process for the preparation of urea
UA95610C2 (en) Method for modernizing a urea production plant, process and plant for urea production
WO2002000598A3 (en) Process for the production of aromatic amines
UA81430C2 (en) Process and plant for the production of urea
EP3999489A1 (en) A process for the synthesis of urea
WO2009080241A3 (en) Process for the preparation of melamine
EP1844024B1 (en) Process for the preparation of melamine

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880122203.0

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08865550

Country of ref document: EP

Kind code of ref document: A2

WWE Wipo information: entry into national phase

Ref document number: 2008865550

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 201070769

Country of ref document: EA

WWE Wipo information: entry into national phase

Ref document number: 12809303

Country of ref document: US