CH144849A - Process for the production of urea. - Google Patents

Process for the production of urea.

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Publication number
CH144849A
CH144849A CH144849DA CH144849A CH 144849 A CH144849 A CH 144849A CH 144849D A CH144849D A CH 144849DA CH 144849 A CH144849 A CH 144849A
Authority
CH
Switzerland
Prior art keywords
urea
production
ammonia
catalysts
carbon dioxide
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
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
Publication of CH144849A publication Critical patent/CH144849A/en

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

Description

  

      Verfahren    zur     Herstellung'von        Harnstof.       Es wurde gefunden, dass man bei der  katalytischen Herstellung von Harnstoff  durch Erhitzen von Ammoniak und Kohlen  dioxyd sehr vorteilhaft als Katalysatoren  Karbide     verwenden    kann. Es können zum  Beispiel die Karbide des Eisens, Titans, Si  liziums und der     Erdalkalimetalle    als Kata  lysatoren dienen. Die bei dem Verfahren an  zuwendenden Temperaturen liegen zweck  mässig oberhalb<B>250'</B> C.  



  An Stelle der reinen Gase können auch  Gemische verwendet werden, die ausser Koh  lendioxyd und Ammoniak unter den Reak  tionsbedingungen indifferente Gase enthalten.  <I>Beispiel:</I>  Ein Gemisch aus 4     Volumteilen    Kohlen  säure und 10     Volumteilen    Ammoniak wird  bei etwa 500   C über     Siliziumkarbid    gelei-         tet;    in der stark gekühlten Vorlage scheidet  sich reiner Harnstoff ab.



      Process for the production of urea. It has been found that in the catalytic production of urea by heating ammonia and carbon dioxide, carbides can be used very advantageously as catalysts. For example, the carbides of iron, titanium, silicon and alkaline earth metals can be used as catalysts. The temperatures to be used in the process are expediently above <B> 250 '</B> C.



  Instead of the pure gases, mixtures can also be used which, in addition to carbon dioxide and ammonia, contain gases which are inert under the reaction conditions. <I> Example: </I> A mixture of 4 parts by volume of carbonic acid and 10 parts by volume of ammonia is conducted over silicon carbide at around 500 C; Pure urea is deposited in the strongly cooled receiver.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Harnstoff durch Erhitzen von Kohlendioxyd und Am moniak, in Gegenwart von Katalysatoren, dadurch gekennzeichnet, dass man als Kata lysatoren Karbide verwendet. UNTERANSPRUCH: Verfahren gemäss Patentanspruch, da durch gekennzeichnet, dass man Kohlen dioxyd und Ammoniak verwendet, die reak tionsindifferente Gase enthalten. PATENT CLAIM: Process for the production of urea by heating carbon dioxide and ammonia in the presence of catalysts, characterized in that carbides are used as catalysts. SUBCLAIM: Process according to claim, characterized in that carbon dioxide and ammonia are used which contain gases which are indifferent to reaction.
CH144849D 1928-08-22 1929-06-26 Process for the production of urea. CH144849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE144849X 1928-08-22

Publications (1)

Publication Number Publication Date
CH144849A true CH144849A (en) 1931-01-31

Family

ID=5670433

Family Applications (1)

Application Number Title Priority Date Filing Date
CH144849D CH144849A (en) 1928-08-22 1929-06-26 Process for the production of urea.

Country Status (1)

Country Link
CH (1) CH144849A (en)

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