GB803195A - Process for the production of melamine - Google Patents
Process for the production of melamineInfo
- Publication number
- GB803195A GB803195A GB32079/56A GB3207956A GB803195A GB 803195 A GB803195 A GB 803195A GB 32079/56 A GB32079/56 A GB 32079/56A GB 3207956 A GB3207956 A GB 3207956A GB 803195 A GB803195 A GB 803195A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melamine
- ammonia
- hydrogen cyanide
- oxide
- catalyst
- 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.)
- Expired
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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
Abstract
Melamine is prepared by heating a mixture of hydrogen cyanide and ammonia in the vapour phase at a temperature of 400-750 DEG C. (preferably 450-600 DEG C.) and at substantially atmospheric pressure in the presence of a dehydrogenation catalyst comprising an oxide of chromium and/or a metal of Group VIII of the Periodic System. Specified catalysts are chromic oxide, platinum, palladium, nickel, cobalt or mixtures thereof. Specified supports are silica gel, alumina, pumice, fuller's earth, kieselguhr, kaolin and charcoal. The chromium oxide catalyst may contain 5 per cent of stabilizing agents such as difficultly reducible oxides of zirconium, titanium, silicon, thorium, boron or magnesium, light reducible oxides of tellurium or beryllium, or chromoxide gel. The mol. ratio of hydrogen cyanide to ammonia is preferably at least 1:1 and more preferably from 1:4 to 1:10. In the examples melamine is prepared by passing a mixture of vaporized hydrogen cyanide and ammonia through an electrically heated quartz tube containing a bed of catalyst consisting of activated alumina impregnated with chromic oxide, platinum, nickel or cobalt. The melamine may be subsequently converted to the picrate or oxalate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US803195XA | 1955-10-21 | 1955-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB803195A true GB803195A (en) | 1958-10-22 |
Family
ID=22156628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32079/56A Expired GB803195A (en) | 1955-10-21 | 1956-10-22 | Process for the production of melamine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB803195A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3054796A (en) * | 1960-07-18 | 1962-09-18 | Grace W R & Co | Melamine process |
| EP2072504A1 (en) * | 2007-12-20 | 2009-06-24 | DSMIP Assets B.V. | Process for the preparation of melamine |
-
1956
- 1956-10-22 GB GB32079/56A patent/GB803195A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3054796A (en) * | 1960-07-18 | 1962-09-18 | Grace W R & Co | Melamine process |
| EP2072504A1 (en) * | 2007-12-20 | 2009-06-24 | DSMIP Assets B.V. | Process for the preparation of melamine |
| WO2009080241A3 (en) * | 2007-12-20 | 2009-08-27 | Dsm Ip Assets B.V. | Process for the preparation of melamine |
| WO2009080240A3 (en) * | 2007-12-20 | 2009-09-11 | Dsm Ip Assets B.V. | Process for the preparation of melamine |
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