DE739038C - Process for the production of melamine - Google Patents

Process for the production of melamine

Info

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
Application number
DEH157636D
Other languages
German (de)
Inventor
Dr Rudolf Koehler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Priority to DEH157636D priority Critical patent/DE739038C/en
Application granted granted Critical
Publication of DE739038C publication Critical patent/DE739038C/en
Expired legal-status Critical Current

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)

PATENTANSPRUCH: Ausführungsform des Verfahrens nach Patent 733774 zur Herstellung von 'Melamin durch Erhitzen 'von Dicyandiamid bzw. Cyanamid in geschlossenem Gefäß in Anwesenheit eines hochgespannten indifferenten Gases, dadurch gekennzeichnet,- daß man als indifferentes Gas Wasserstoff verwendet.PATENT CLAIM: Embodiment of the process according to patent 733774 for the production of 'melamine by heating' dicyandiamide or cyanamide in a closed vessel in the presence of a high- tension inert gas, characterized in that hydrogen is used as the inert gas.
DEH157636D 1938-11-11 1938-11-11 Process for the production of melamine Expired DE739038C (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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