GB916187A - Process for the preparation of pure melamine - Google Patents
Process for the preparation of pure melamineInfo
- Publication number
- GB916187A GB916187A GB31776/61A GB3177661A GB916187A GB 916187 A GB916187 A GB 916187A GB 31776/61 A GB31776/61 A GB 31776/61A GB 3177661 A GB3177661 A GB 3177661A GB 916187 A GB916187 A GB 916187A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melamine
- solution
- rectification
- preparation
- carbon dioxide
- 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)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Melamine is obtained from a gas mixture which contains melamine, ammonia, carbon dioxide and solid impurities, by absorbing the mixture in water, removing ammonia and carbon dioxide from the resulting solution by rectification, removing solid impurities, and crystallising and separating melamine from the solution. The temperature of the solution in the absorption step is preferably kept at approximately 65 DEG C. After rectification the solution may be clarified by treatment with an absorbing agent e.g. diatomaceous earth, kieselguhr, or activated carbon. The melamine is preferably separated by crystallisation at below atmospheric pressure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL255602 | 1960-09-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB916187A true GB916187A (en) | 1963-01-23 |
Family
ID=19752545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31776/61A Expired GB916187A (en) | 1960-09-05 | 1961-09-04 | Process for the preparation of pure melamine |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE607793A (en) |
CH (1) | CH417615A (en) |
GB (1) | GB916187A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2835720A (en) * | 1955-05-09 | 1958-05-20 | Gen Motors Corp | Battery vent plug |
US3290308A (en) * | 1964-02-11 | 1966-12-06 | Chemical Construction Corp | Synthesis of pure melamine |
-
1961
- 1961-09-04 BE BE607793A patent/BE607793A/en unknown
- 1961-09-04 GB GB31776/61A patent/GB916187A/en not_active Expired
- 1961-09-05 CH CH1027961A patent/CH417615A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2835720A (en) * | 1955-05-09 | 1958-05-20 | Gen Motors Corp | Battery vent plug |
US3290308A (en) * | 1964-02-11 | 1966-12-06 | Chemical Construction Corp | Synthesis of pure melamine |
Also Published As
Publication number | Publication date |
---|---|
BE607793A (en) | 1962-03-05 |
CH417615A (en) | 1966-07-31 |
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