DE739038C - Process for the production of melamine - Google Patents
Process for the production of melamineInfo
- Publication number
- DE739038C DE739038C DEH157636D DEH0157636D DE739038C DE 739038 C DE739038 C DE 739038C DE H157636 D DEH157636 D DE H157636D DE H0157636 D DEH0157636 D DE H0157636D DE 739038 C DE739038 C DE 739038C
- Authority
- DE
- Germany
- Prior art keywords
- melamine
- production
- hydrogen
- inert gas
- dicyandiamide
- 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
Description
Verfahren zur Herstellung von Melamin Gegenstand, des Hauptpatents 733 774 ist ein Verfahren zur Herstellung von Melamin durch Erhitzen von Dicyandiamid bzw. Cyanamid, wobei die Erhitzung in geschlossenem Gefäß in Anwesenheit eines hochgespannten indifferenten Gases erfolgt.Process for the production of melamine The subject of the main patent 733 774 is a process for the production of melamine by heating dicyandiamide or cyanamide, the heating being carried out in a closed vessel in the presence of a highly stressed inert gas.
Es hat sich nun als besonders vorteilhaft erwiesen, als indifferentes Gas Wasserstoff zu verwenden. Hierbrei können Ausbeuten von über goa/o der Theorie, berechnet auf die angewandte Menge Dicyandiamid, erhalten werden. Im übrigen arbeitet das Verfahren unter denselben Bedingungen, wie sie im Hauptpatent beschrieben worden sind. ° Beispiel In einen Autoklaven von 11 Inhalt, der 200 g Dicyandianzid enthält, wird so lange Wasserstoff eingepreßt, bis der Druck im Autoklaven töoätü beträgt. Dann wird auf etwa i8o bis 2oo°- erhitzt, wobei der Druck auf i 6o atü ansteigt. Die genannte Temperatur wird ungefähr 4 Stunden gehalten. Danach wird erkalten gelassen. Das Umsetzungsgut enthält Melamin in einer Ausbeute von 92 bis 93%, berechnet auf die angewandte Menge Dicyandiamid; das Erzeugnis kann durch Umkristallisieren aus Wasser gereinigt werden.It has now proven to be particularly advantageous to use hydrogen as the inert gas. In this way, yields of over 100% of theory, calculated on the amount of dicyandiamide used, can be obtained. Otherwise, the process works under the same conditions as those described in the main patent. ° Example 1 In an autoclave of 1 content that is 200 g Dicyandianzid contains as long as hydrogen is injected until the pressure in the autoclave is töoätü. Then it is heated to about 180 to 200 ° - the pressure rises to 160 atmospheres. The said temperature is held for about 4 hours. Then it is left to cool. The reaction material contains melamine in a yield of 92 to 93%, calculated on the amount of dicyandiamide used; the product can be purified by recrystallization from water.
Arbeitet man unter geringerem Wasserstoffüberdruck, so sinkt die Ausbeute etwas. Zum Beispiel erhält man bei einem Höchstdruck von 4o atü Wasserstoff und bei 18o bis 200° eine Ausbeute von 86% Melamin.If you work under a lower hydrogen pressure, the yield drops some. For example, at a maximum pressure of 40 atmospheres hydrogen and at 18o to 200 ° a yield of 86% melamine.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH157636D DE739038C (en) | 1938-11-11 | 1938-11-11 | Process for the production of melamine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH157636D DE739038C (en) | 1938-11-11 | 1938-11-11 | Process for the production of melamine |
Publications (1)
Publication Number | Publication Date |
---|---|
DE739038C true DE739038C (en) | 1943-09-09 |
Family
ID=7182645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEH157636D Expired DE739038C (en) | 1938-11-11 | 1938-11-11 | Process for the production of melamine |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE739038C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE879697C (en) * | 1950-06-27 | 1953-06-15 | Sueddeutsche Kalkstickstoff | Process for the preparation of aminotriazines, especially triaminotriazine |
DE953081C (en) * | 1950-02-11 | 1956-11-29 | Sueddeutsche Kalkstickstoff | Process for the production of melamine from dicyandiamide |
-
1938
- 1938-11-11 DE DEH157636D patent/DE739038C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE953081C (en) * | 1950-02-11 | 1956-11-29 | Sueddeutsche Kalkstickstoff | Process for the production of melamine from dicyandiamide |
DE879697C (en) * | 1950-06-27 | 1953-06-15 | Sueddeutsche Kalkstickstoff | Process for the preparation of aminotriazines, especially triaminotriazine |
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