DE523520C - Process for the production of thiourea - Google Patents

Process for the production of thiourea

Info

Publication number
DE523520C
DE523520C DEI39575D DEI0039575D DE523520C DE 523520 C DE523520 C DE 523520C DE I39575 D DEI39575 D DE I39575D DE I0039575 D DEI0039575 D DE I0039575D DE 523520 C DE523520 C DE 523520C
Authority
DE
Germany
Prior art keywords
thiourea
production
liquids
calcium cyanamide
reaction product
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
DEI39575D
Other languages
German (de)
Inventor
Dr Georg Schiller
Dr Max Schuetze
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI39575D priority Critical patent/DE523520C/en
Application granted granted Critical
Publication of DE523520C publication Critical patent/DE523520C/en
Expired legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Verfahren zur Herstellung von Thioharnstoff In der Patentschrift 5:2r 966 ist ein Verfahren zur Herstellung von Thioharnstoff aus Kalkstickstoff und Schwefelwasserstoff beschrieben, das darin besteht, daß man den Kalkstickstoff in Gegenwart von geringen Flüssigkeitsmengen mit Schwefelwasserstoff behandelt und aus dem Reaktionsprodukt den Thioharnstoff durch Extraktion mittels organischer Flüssigkeiten gewinnt.Method of Making Thiourea In Patent 5: 2r 966 is a process for making thiourea from calcium cyanamide and hydrogen sulfide described, which consists in the fact that the calcium cyanamide in the presence of a small amount Liquids treated with hydrogen sulfide and from the reaction product the thiourea is obtained by extraction with organic liquids.

Es wurde nun gefunden, daß das Verfahren auch in der Weise ausgeführt werden kann, daß man auf den Zusatz von Flüssigkeiten bei der Reaktion ganz verzichtet. Vorteilhaft arbeitet man dabei in Gegenwart von Ammoniak und unter Druck. Die Masse bleibt hierbei lockerer und ist leichter zu behandeln als beim Arbeiten in Gegenwart von Flüssigkeiten. Auch fällt das unter Umständen notwendige Trocknen des Reaktionsproduktes vor dem Extrahieren weg. Die Aufarbeitung des Reaktionsproduktes erfolgt in der in dem Hauptpatent angegebenen Weise. Der Thioharnstoff wird in guter Ausbeute gewonnen. Beispiel Auf trockenen Kalkstickstoff läßt man in einem Rührautoklaven Ammoniakgas bei einem solchen Druck einwirken, daß auf einen Teil Kalkstickstoff etwa o,oo5 Gewichtsteile Ammoniak kommen, und gibt hierauf Schwefelwasserstoff unter weitererg,'Rülzreia."L)is etwa ro Atm. Druck zu. Die sT'emperälur wird auf 75' gehalten. Nach erfolgter Umsetzung wird der gebildete Thioharnstoff durch Extrahieren mit Lösungsmitteln, z. B. einem Alkohol-Tetrachlorkohlenstoff-Gemisch oder Alkohol-Benzol-Gemisch, gewonnen.It has now been found that the process can also be carried out in such a way that the addition of liquids during the reaction is completely dispensed with. It is advantageous to work in the presence of ammonia and under pressure. The mass remains looser and is easier to handle than when working in the presence of liquids. The drying of the reaction product before extraction, which may be necessary under certain circumstances, is also dispensed with. The reaction product is worked up in the manner indicated in the main patent. The thiourea is recovered in good yield. Example Ammonia gas is allowed to act on dry calcium cyanamide in a stirred autoclave at such a pressure that about 0.05 parts by weight of ammonia are added to one part of calcium cyanamide, and hydrogen sulphide is then added under further "Rülzreia." L) is about 1 atm. Pressure. The temperature is kept at 75. After the reaction has taken place, the thiourea formed is obtained by extraction with solvents, for example an alcohol-carbon tetrachloride mixture or an alcohol-benzene mixture.

Claims (1)

PATENTANSPRUCH: WeiterbildungdesVerfahrens des Hauptpatents 521 966 zur Herstellung von Thioharnstoff aus Kalkstickstoff und Schwefelwasserstoff, dadurch gekennzeichnet, daß man in Abwesenheit von Flüssigkeiten arbeitet.Claim: Further development of the process of the main patent 521 966 for the production of thiourea from calcium cyanamide and hydrogen sulfide, characterized in that one works in the absence of liquids.
DEI39575D 1929-10-17 1929-10-17 Process for the production of thiourea Expired DE523520C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI39575D DE523520C (en) 1929-10-17 1929-10-17 Process for the production of thiourea

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI39575D DE523520C (en) 1929-10-17 1929-10-17 Process for the production of thiourea

Publications (1)

Publication Number Publication Date
DE523520C true DE523520C (en) 1931-04-29

Family

ID=7190090

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI39575D Expired DE523520C (en) 1929-10-17 1929-10-17 Process for the production of thiourea

Country Status (1)

Country Link
DE (1) DE523520C (en)

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