GB985290A - Improved process for the preparation of melamine - Google Patents
Improved process for the preparation of melamineInfo
- Publication number
- GB985290A GB985290A GB10931/63A GB1093163A GB985290A GB 985290 A GB985290 A GB 985290A GB 10931/63 A GB10931/63 A GB 10931/63A GB 1093163 A GB1093163 A GB 1093163A GB 985290 A GB985290 A GB 985290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reactants
- urea
- melamine
- sulphamic acid
- salt
- 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)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Melamine is prepared by reacting urea with a salt or amide of sulphamic acid without the addition of ammonia, the molar ratio of the two reactants being substantially 1:1 (i.e. \sB 10%) when these reactants are urea and a salt of sulphamic acid, and substantially 2:1 (i.e. \sB 25%) when the reactants are urea and sulphamide respectively, the reaction temperature being maintained uniform throughout the reaction zone, and being from 280 DEG to 340 DEG C., and the pressure being at least 50 p.s.i.g. (4.5 atmospheres abs.). The sulphamate is preferably an ammonium or alkali metal sulphamate, but small amounts of sulphamic acid may also be present, as well as catalytic amounts of boron, phosphorus, arsenic or antimony compounds. Specification 913,522 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18103262A | 1962-03-20 | 1962-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB985290A true GB985290A (en) | 1965-03-03 |
Family
ID=22662618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10931/63A Expired GB985290A (en) | 1962-03-20 | 1963-03-19 | Improved process for the preparation of melamine |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE629723A (en) |
| GB (1) | GB985290A (en) |
-
1963
- 1963-03-18 BE BE629723A patent/BE629723A/en unknown
- 1963-03-19 GB GB10931/63A patent/GB985290A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE629723A (en) | 1963-10-21 |
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