MX9704638A - Procedimiento para la produccion de melamina de alta pureza. - Google Patents
Procedimiento para la produccion de melamina de alta pureza.Info
- Publication number
- MX9704638A MX9704638A MX9704638A MX9704638A MX9704638A MX 9704638 A MX9704638 A MX 9704638A MX 9704638 A MX9704638 A MX 9704638A MX 9704638 A MX9704638 A MX 9704638A MX 9704638 A MX9704638 A MX 9704638A
- Authority
- MX
- Mexico
- Prior art keywords
- melamine
- temperature
- cooling
- degree
- purity
- Prior art date
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
- C07D251/62—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)
Abstract
En un procedimiento para producir melamina de alta pureza, la melamina se somete a un tratamiento subsecuente que tiene los siguientes pasos: (a) remover la mezcla de gas de NH3/CO2 de la melamina líquida; si se requiere, (b) reducir el CO2 disuelto en la melamina líquida mediante mezcla del gas amoniacal; (c) dejar que la melamina líquida repose durante un tiempo de reposo promedio de 0 a 8 horas a una temperatura de entre 430 degree C y el punto de fusion de la melamina bajo una presion parcial de amoniaco de 50 a 400 bares; y (d) enfriar lentamente en una forma controlada reduciendo la temperatura en (a), (b) o (c) por abajo de una temperatura de 330 a 270 degree C a un régimen de enfriamiento de hasta 150 degree C/min bajo presion parcial de amoniaco desde 50 a 400 bares. Las presiones superiores permiten regímenes de enfriamiento más rápidos e inversamente, las presiones inferiores requieren regímenes de enfriamiento más lentos. Se obtiene después un polvo de melamina de alta pureza expandiendo y enfriándolo a la temperatura ambiente en cualquier orden.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0239294A AT402294B (de) | 1994-12-23 | 1994-12-23 | Verfahren zur herstellung von hochreinem melamin |
| ATA2392/94 | 1994-12-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9704638A true MX9704638A (es) | 1998-07-31 |
| MXPA97004638A MXPA97004638A (es) | 1998-11-09 |
Family
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Also Published As
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG | Grant or registration | ||
| MM | Annulment or lapse due to non-payment of fees |