GB825730A - Process for the production of melamine - Google Patents
Process for the production of melamineInfo
- Publication number
- GB825730A GB825730A GB40218/57A GB4021857A GB825730A GB 825730 A GB825730 A GB 825730A GB 40218/57 A GB40218/57 A GB 40218/57A GB 4021857 A GB4021857 A GB 4021857A GB 825730 A GB825730 A GB 825730A
- Authority
- GB
- United Kingdom
- Prior art keywords
- guanidine sulphamate
- melamine
- sulphamate
- guanidine
- urea
- 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 produced by charging urea, guanidine sulphamate, ammonia and sulphur dioxide into a reaction zone maintained above 260 DEG C. and under a superatmospheric pressure of ammonia, continuing the reaction to produce a product containing melamine, sulphur, ammonium sulphate and guanidine sulphamate, the yield of melamine being 30-55% of the theoretical yield based on the carbon content of the urea and guanidine sulphamate charged, continuously withdrawing the reaction product from the reaction zone as a suspension in molten guanidine sulphamate, and separately recovering melamine, ammonium sulphate and guanidine sulphamate. Part at least of the recovered guanidine sulphamate may be re-cycled. The mol. ratio of guanidine sulphamate to urea in the reaction charge is preferably from 0.8:1 to 2.3:1, and of SO2 to urea preferably 3:2. The ammonium pressure is preferably above 34 atmospheres. The reaction product is preferably separated into its components by leaching to form an aqueous solution of guanidine sulphamate and ammonium sulphate, treating the residue to obtain melamine, evaporating the leach solution to precipitate ammonium sulphate, cooling to precipitate guanidine sulphamate, returning the solution to the evaporation step, drying the guanidine sulphamate, e.g. in the molten state, and returning at least part of it to the reaction zone. Reference has been directed by the Comptroller to Specifications 704,593 and 713,223.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB40218/57A GB825730A (en) | 1957-12-27 | 1957-12-27 | Process for the production of melamine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB40218/57A GB825730A (en) | 1957-12-27 | 1957-12-27 | Process for the production of melamine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB825730A true GB825730A (en) | 1959-12-23 |
Family
ID=10413798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB40218/57A Expired GB825730A (en) | 1957-12-27 | 1957-12-27 | Process for the production of melamine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB825730A (en) |
-
1957
- 1957-12-27 GB GB40218/57A patent/GB825730A/en not_active Expired
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