GB713223A - Process for the manufacture of melamine - Google Patents
Process for the manufacture of melamineInfo
- Publication number
- GB713223A GB713223A GB11456/52A GB1145652A GB713223A GB 713223 A GB713223 A GB 713223A GB 11456/52 A GB11456/52 A GB 11456/52A GB 1145652 A GB1145652 A GB 1145652A GB 713223 A GB713223 A GB 713223A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melamine
- sulphamate
- reaction
- ammonia
- enamels
- 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
-
- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Melamine is manufactured by heating guanidine sulphamate in the presence of ammonia to at least 260 DEG C. in a reaction zone maintained under a superatmospheric pressure of ammonia (preferably at least about 500 lbs./sq. in.). The reaction mixture may be made more fluid (enabling the process to be operated continuously) by introducing ammonium sulphamate with the starting materials, e.g. part of the ammonium sulphamate formed as a by-product may be recycled with unreacted guanidine sulphamate. The reaction product may be withdrawn in a fluid state and the melamine separated therefrom, e.g. by cooling and leaching with cold water and then leaching out the melamine from the residue with hot water. The reaction vessel should be lined with corrosion-resisting material, e.g. tantalum or certain glasses or enamels. Examples show the effects of variations in the time and conditions of the reaction.ALSO:Apparatus for the manufacture of melamine by heating guanidine sulphamate under a superatmospheric pressure of ammonia may be lined with tantalum or certain glasses or enamels to resist corrosion.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA713223X | 1951-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB713223A true GB713223A (en) | 1954-08-04 |
Family
ID=4172232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11456/52A Expired GB713223A (en) | 1951-05-14 | 1952-05-06 | Process for the manufacture of melamine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB713223A (en) |
-
1952
- 1952-05-06 GB GB11456/52A patent/GB713223A/en not_active Expired
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