AT68167B - Process for the preparation of nitric acid guanidine from cyanamide. - Google Patents
Process for the preparation of nitric acid guanidine from cyanamide.Info
- Publication number
- AT68167B AT68167B AT68167DA AT68167B AT 68167 B AT68167 B AT 68167B AT 68167D A AT68167D A AT 68167DA AT 68167 B AT68167 B AT 68167B
- Authority
- AT
- Austria
- Prior art keywords
- nitric acid
- cyanamide
- preparation
- acid guanidine
- guanidine
- Prior art date
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
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Verfahren zur Darstellung von salpetersaurem Guanidin aus Cyanamid.
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Verbindungen gehen in stark sauren Lösungen durch Behandlung mit Königswasser oder Chloraton in Guanidin über. Auch durch Erhitzen ihrer Lösungen unter Druck bei höherer Temperatur kann nach D. R. P. Nr. 242216 Guanidin erhalten werden. Die Überführung
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die Salpetersäure zusetzt und dann weiter eindampft oder ob man erst konzentriert und dann die Säure zusetzt. Jedenfalls muss aber bis zum Aufhören der Gasentwicklung gekocht worden. Die Konzentration der Lauge und Saure ist belanglos.
Zweckmässigerweise wird man natürlich so konzentriert arbeiten, dass erhebliche Mengen des Produktes mangels Lösungsmittels ausfallen und weiters sicherbeitschalber auch einen Überschuss an Salpeter-
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löslich ist als in Wasser.
Man kann beispielsweise folgendermassen arbeiten : Durch Auslaugen von Kalkstlcktoff und Fällen des Kalkes mit Kohlensäure wird eine wässerige Lösung vou Cyanamid hergestellt. Diese Lösung wird mit Salpetersäure im Überschuss versetzt und eingedampft. Mac kann jedoch auch nach Konzentration der Lösung auf ein beliebiges Mass die Salpetersäure zusetzen, nur ist in ersterem Falle die Gasentwicklung (CO2) weniger lästig als in letzterem Falle.
Nach dem Erkalten der Flüssigkeit scheidet sich die Vfrbimi ng aus und kann von der Mutterlauge, die wegen ihres Satpetersäureüberschusses bei eine) nächsten Operation zugesetzt wird, durch Abnutschen getrennt werden, Hat sich in der Mutterlauge Ammoniumnitrat angereichert, so wird sie beseitigt und auf dieses Salz verarbeitet.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Process for the preparation of nitric acid guanidine from cyanamide.
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In strongly acidic solutions, compounds are converted into guanidine by treatment with aqua regia or chlorate. According to D. R. P. No. 242216 guanidine can also be obtained by heating their solutions under pressure at a higher temperature. The overpass
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add the nitric acid and then continue to evaporate, or whether you concentrate first and then add the acid. In any case, it must be boiled until the evolution of gas has ceased. The concentration of the lye and acid is irrelevant.
It is advisable, of course, to work in such a concentrated manner that considerable quantities of the product precipitate due to a lack of solvent and, furthermore, an excess of saltpeter
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is more soluble than in water.
One can work as follows, for example: By leaching out limestone and precipitating the lime with carbonic acid, an aqueous solution of cyanamide is produced. This solution is mixed with excess nitric acid and evaporated. Mac can, however, add any amount of nitric acid even after concentrating the solution, only in the former case the evolution of gas (CO2) is less bothersome than in the latter case.
After the liquid has cooled down, the mixture separates and can be separated from the mother liquor, which is added in the next operation because of its excess satpetic acid, by suction filtration.If ammonium nitrate has accumulated in the mother liquor, it is removed and this salt is added processed.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT68167T | 1913-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT68167B true AT68167B (en) | 1915-03-10 |
Family
ID=3590050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT68167D AT68167B (en) | 1913-03-19 | 1913-03-19 | Process for the preparation of nitric acid guanidine from cyanamide. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT68167B (en) |
-
1913
- 1913-03-19 AT AT68167D patent/AT68167B/en active
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