NO995886L - Process for the preparation of melamine - Google Patents

Process for the preparation of melamine

Info

Publication number
NO995886L
NO995886L NO995886A NO995886A NO995886L NO 995886 L NO995886 L NO 995886L NO 995886 A NO995886 A NO 995886A NO 995886 A NO995886 A NO 995886A NO 995886 L NO995886 L NO 995886L
Authority
NO
Norway
Prior art keywords
melamine
cooled
powder
melt
reactor
Prior art date
Application number
NO995886A
Other languages
Norwegian (no)
Other versions
NO995886D0 (en
Inventor
Tjay Tjien Tjioe
Hubertus Josef Maria Slangen
Original Assignee
Dsm Nv
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
Priority claimed from NL1006192A external-priority patent/NL1006192C2/en
Application filed by Dsm Nv filed Critical Dsm Nv
Publication of NO995886D0 publication Critical patent/NO995886D0/en
Publication of NO995886L publication Critical patent/NO995886L/en

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
    • 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

Landscapes

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

Abstract

Metode for fremstilling av melamin fra urea via en høy- trykksprosess i hvilken fast melamin blir oppnådd ved å overføre melaminsmelten som kommer fra reaktoren, til et kar hvor melaminsmelten nedkjøles med et kjølemiddel som fordamper. Melaminsmelten kommer fra reaktoren ved en temperatur mellom smeltepunktet for melamin og 450 °C og blir sprutet inn i et kjølekar, via sprayanordninger, som har en ammoniakkatmosfære med et økt ammoniakktrykk og nedkjølt ved hjelp av et fordampende kjølemiddel til å gi et melaminpulver. Melaminsmelten blir derved omdannet til melaminpulver med en temperatur på 270 °C eller lavere etter hvilket ammoniakktrykket blir frigjort og melamin- pulveret blir nedkjølt i det minste i en del av kjøle- området, av pulveret som blir satt mekanisk i bevegelse og blir nedkjølt direkte eller indirekte og, hvis nødvendig blir melaminpulveret ytterligere nedkjølt.Method for producing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the melamine melt coming from the reactor to a vessel where the melamine melt is cooled with a refrigerant which evaporates. The melamine melt comes from the reactor at a temperature between the melamine melting point and 450 ° C and is injected into a cooling vessel, via sprayers, which has an ammonia atmosphere with an increased ammonia pressure and cooled by an evaporative coolant to give a melamine powder. The melamine melt is thereby converted into melamine powder at a temperature of 270 ° C or lower after which the ammonia pressure is released and the melamine powder is cooled at least in part of the cooling region, by the powder which is mechanically moved and cooled directly or indirectly and, if necessary, the melamine powder is further cooled.

NO995886A 1997-06-02 1999-12-01 Process for the preparation of melamine NO995886L (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1006192A NL1006192C2 (en) 1997-06-02 1997-06-02 Melamine is prepared from urea in a high pressure process
EP97201804 1997-06-16
PCT/NL1998/000281 WO1998055466A1 (en) 1997-06-02 1998-05-15 Method for preparing melamine

Publications (2)

Publication Number Publication Date
NO995886D0 NO995886D0 (en) 1999-12-01
NO995886L true NO995886L (en) 2000-01-26

Family

ID=26146601

Family Applications (1)

Application Number Title Priority Date Filing Date
NO995886A NO995886L (en) 1997-06-02 1999-12-01 Process for the preparation of melamine

Country Status (10)

Country Link
EP (1) EP0986547A1 (en)
JP (1) JP2002502416A (en)
KR (1) KR20010013245A (en)
CN (1) CN1265100A (en)
AU (1) AU728823B2 (en)
CA (1) CA2292597A1 (en)
ID (1) ID24348A (en)
NO (1) NO995886L (en)
TW (1) TW393450B (en)
WO (1) WO1998055466A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6380385B1 (en) 1995-12-07 2002-04-30 Agrolinz Melanin Gmbh Process for the preparation of pure melamine
KR100495262B1 (en) * 1997-05-21 2005-06-14 코닌클리즈케 디에스엠 엔.브이. Method for preparing melamine
TWI221472B (en) * 1997-10-15 2004-10-01 Dsm Ip Assets Bv Process for the preparation of melamine
EP1035117A1 (en) * 1999-03-08 2000-09-13 Dsm N.V. Method for preparing melamine from urea
AU6697600A (en) * 1999-07-27 2001-02-13 Agrolinz Melamin Gmbh Method for producing solid melamine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565867A (en) * 1984-01-05 1986-01-21 Melamine Chemicals, Inc. Anhydrous high-pressure melamine synthesis
AT402294B (en) * 1994-12-23 1997-03-25 Agrolinz Melamin Gmbh METHOD FOR PRODUCING HIGH PURITY MELAMINE
AT402295B (en) * 1994-12-23 1997-03-25 Agrolinz Melamin Gmbh METHOD FOR PURIFYING MELAMINE
AT402296B (en) * 1995-02-03 1997-03-25 Agrolinz Melamin Gmbh METHOD FOR PURIFYING MELAMINE
US5514797A (en) * 1995-06-07 1996-05-07 Melamine Chemicals, Inc. Method for increasing purity of melamine
US5514796A (en) * 1995-06-07 1996-05-07 Melamine Chemicals, Inc. Melamine of improved purity produced by high-pressure, non-catalytic process
AT403579B (en) * 1995-12-07 1998-03-25 Agrolinz Melamin Gmbh METHOD FOR PRODUCING HIGH PURITY MELAMINE
NL1003105C2 (en) * 1996-05-14 1997-11-18 Dsm Nv Process for the preparation of melamine.
NL1003328C2 (en) * 1996-06-13 1997-12-17 Dsm Nv Process for preparing melamine.
CN1130353C (en) * 1997-05-28 2003-12-10 Dsm有限公司 Method for preparing melamine

Also Published As

Publication number Publication date
NO995886D0 (en) 1999-12-01
WO1998055466A1 (en) 1998-12-10
ID24348A (en) 2000-07-13
EP0986547A1 (en) 2000-03-22
CN1265100A (en) 2000-08-30
AU7555698A (en) 1998-12-21
TW393450B (en) 2000-06-11
KR20010013245A (en) 2001-02-26
JP2002502416A (en) 2002-01-22
AU728823B2 (en) 2001-01-18
CA2292597A1 (en) 1998-12-10

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Legal Events

Date Code Title Description
FC2A Withdrawal, rejection or dismissal of laid open patent application