DK0799213T3 - Process for the purification of melamine - Google Patents

Process for the purification of melamine

Info

Publication number
DK0799213T3
DK0799213T3 DK95942138T DK95942138T DK0799213T3 DK 0799213 T3 DK0799213 T3 DK 0799213T3 DK 95942138 T DK95942138 T DK 95942138T DK 95942138 T DK95942138 T DK 95942138T DK 0799213 T3 DK0799213 T3 DK 0799213T3
Authority
DK
Denmark
Prior art keywords
melamine
ammonia pressure
purification
temperature
bars
Prior art date
Application number
DK95942138T
Other languages
Danish (da)
Inventor
Helmut Fingrhut
Lorenzo Canzi
Gerhard Coufal
Silvano Giacomuzzo
Llner Martin M
Original Assignee
Agrolinz Melamin Gmbh
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 Agrolinz Melamin Gmbh filed Critical Agrolinz Melamin Gmbh
Application granted granted Critical
Publication of DK0799213T3 publication Critical patent/DK0799213T3/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
    • C07D251/62—Purification 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)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Distillation Of Fermentation Liquor, Processing Of Alcohols, Vinegar And Beer (AREA)
  • Color Printing (AREA)

Abstract

In a melamine purifying process, impure melamine is heated up to a temperature above 200 DEG C but below the ammonia pressure-dependent, momentary melting point of melamine, and is kept in a solid state in said temperature range under an ammonia pressure from 5 to 350 bars for a period from 1 minute to 20 hours. It is then expanded and cooled down to room temperature, in whatever order, to produce pure melamine in powder form.
DK95942138T 1994-12-23 1995-12-13 Process for the purification of melamine DK0799213T3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0239394A AT402295B (en) 1994-12-23 1994-12-23 METHOD FOR PURIFYING MELAMINE
PCT/EP1995/004921 WO1996020183A1 (en) 1994-12-23 1995-12-13 Melamine purifying process

Publications (1)

Publication Number Publication Date
DK0799213T3 true DK0799213T3 (en) 1999-08-02

Family

ID=3533533

Family Applications (1)

Application Number Title Priority Date Filing Date
DK95942138T DK0799213T3 (en) 1994-12-23 1995-12-13 Process for the purification of melamine

Country Status (17)

Country Link
EP (1) EP0799213B1 (en)
JP (1) JPH10511369A (en)
KR (1) KR100374731B1 (en)
CN (1) CN1068315C (en)
AT (2) AT402295B (en)
BR (1) BR9510606A (en)
DE (1) DE59504292D1 (en)
DK (1) DK0799213T3 (en)
ES (1) ES2124034T3 (en)
HR (1) HRP950605B1 (en)
IL (1) IL116516A (en)
NZ (1) NZ298044A (en)
PL (1) PL187434B1 (en)
RO (1) RO115521B1 (en)
RU (1) RU2161610C2 (en)
TW (1) TW299324B (en)
WO (1) WO1996020183A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5514797A (en) * 1995-06-07 1996-05-07 Melamine Chemicals, Inc. Method for increasing purity of melamine
NL1003328C2 (en) 1996-06-13 1997-12-17 Dsm Nv Process for preparing melamine.
NL1003709C2 (en) * 1996-07-30 1998-02-05 Dsm Nv Process for preparing melamine.
ES2197470T3 (en) 1997-05-21 2004-01-01 Dsm Ip Assets B.V. METHOD TO PREPARE MELAMINE.
NL1006095C2 (en) * 1997-05-21 1998-11-25 Dsm Nv Preparation of melamine from urea via a high pressure process
KR100495264B1 (en) 1997-05-28 2005-06-14 코닌클리즈케 디에스엠 엔.브이. Method for preparing melamine
NL1006147C2 (en) * 1997-05-28 1998-12-01 Dsm Nv Pure melamine is formed from urea by spray cooling the melamine melt
DE69837432T2 (en) * 1997-06-02 2007-12-13 Dsm Ip Assets B.V. CRYSTALLINE MELAMINE
NL1006192C2 (en) * 1997-06-02 1998-12-03 Dsm Nv Melamine is prepared from urea in a high pressure process
NL1006191C2 (en) * 1997-06-02 1998-12-03 Dsm Nv Multi-crystalline melamine powder is prepared from urea
WO1998055466A1 (en) * 1997-06-02 1998-12-10 Dsm N.V. Method for preparing melamine
US6355797B2 (en) 1998-01-30 2002-03-12 Agrolinz Melamin Gmbh Process for cooling melamine
NL1008571C2 (en) * 1998-03-12 1999-07-28 Dsm Nv Crystalline melamine.
KR100575020B1 (en) * 1998-12-23 2006-05-02 아엠이-아그로린츠 멜라민 인터내셔날 게엠베하 Method for purifying melamine
AU6697600A (en) * 1999-07-27 2001-02-13 Agrolinz Melamin Gmbh Method for producing solid melamine
RU2417992C2 (en) * 2009-07-20 2011-05-10 Открытое акционерное общество "Научно-исследовательский и проектный институт карбамида и продуктов органического синтеза" (ОАО "НИИК") Method of producing melamine and method of removing dissolved gases from aqueous solution of crude melamine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116294A (en) * 1963-12-31 Process- for preparing high-purity melamine from urea
GB1003277A (en) * 1963-07-10 1965-09-02 Nissan Chemical Ind Ltd Process and apparatus for the production and separation of melamine
DE2522233A1 (en) * 1975-05-20 1976-12-02 Bollmann L Kg Timber board stacking machine - is fitted with conveyor and supply fork equipped with timing and release controls

Also Published As

Publication number Publication date
HRP950605A2 (en) 1997-10-31
WO1996020183A1 (en) 1996-07-04
IL116516A (en) 2000-07-16
PL320790A1 (en) 1997-10-27
DE59504292D1 (en) 1998-12-24
IL116516A0 (en) 1996-03-31
ATE173474T1 (en) 1998-12-15
HRP950605B1 (en) 1999-12-31
EP0799213B1 (en) 1998-11-18
BR9510606A (en) 1999-02-23
ATA239394A (en) 1996-08-15
RO115521B1 (en) 2000-03-30
AT402295B (en) 1997-03-25
CN1171103A (en) 1998-01-21
EP0799213A1 (en) 1997-10-08
RU2161610C2 (en) 2001-01-10
TW299324B (en) 1997-03-01
PL187434B1 (en) 2004-07-30
ES2124034T3 (en) 1999-01-16
CN1068315C (en) 2001-07-11
NZ298044A (en) 1999-07-29
JPH10511369A (en) 1998-11-04
KR100374731B1 (en) 2003-06-09

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