AT69755B - Process for the preparation of nitric acid urea. - Google Patents

Process for the preparation of nitric acid urea.

Info

Publication number
AT69755B
AT69755B AT69755DA AT69755B AT 69755 B AT69755 B AT 69755B AT 69755D A AT69755D A AT 69755DA AT 69755 B AT69755 B AT 69755B
Authority
AT
Austria
Prior art keywords
nitric acid
preparation
acid urea
urea
temperature
Prior art date
Application number
Other languages
German (de)
Original Assignee
Oesterreichischer Ver Fuer Che
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 Oesterreichischer Ver Fuer Che filed Critical Oesterreichischer Ver Fuer Che
Application granted granted Critical
Publication of AT69755B publication Critical patent/AT69755B/en

Links

Landscapes

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

Description

  

   <Desc/Clms Page number 1> 
 
 EMI1.1 
 
 EMI1.2 
 

 <Desc/Clms Page number 2> 

 ausreicht, ein Ansteigen der Temperatur bis zur beginnenden Gasentwicklung zu verhindern. 



  Eine Temperatur von 20  pflegt schon gefährlich zu sein. Sollte sich etwa Gas zu entwickeln anfangen, so unterbricht man unter fortgesetzter Kühlung den Säurezusatz. bis die Erscheinung aufhört, worauf fortgesetzt wird. 



   Die Lauge erstarrt zu einem dicken Brei. Es schadet nicht, wenn Salpetersäure im Überschuss angewendet wird, da in diesem Falle die Mutterlauge bei einer nächsten Operation zugesetzt werden kann. 



   Der Niederschlag wird abgenutscht und muss, was wesentlich ist, durch Decken mit einer reinen, konzentrierten, wässerigen Lösung von Harnstoffnitrat von anhaftender Salpetersäure befreit werden. Geschieht dies nicht, so zersetzt sich das Präparat beim Trocknen. 



   PATENT-ANSPRÜCHE :
1. Verfahren zur Darstellung von   satpetersaurem   Harnstoff durch Behandlung von wässerigen Lösungen von   Cyanam@l   mit Salpetersäure, dadurch gekennzeichnet, dass der Zusatz der Säure unter einer steten Abkühlung des Reaktionsgemisches und   so   langsam erfolgt. dass die Temperatur im Reaktionsgemisch nicht   über 200 steigt.  



   <Desc / Clms Page number 1>
 
 EMI1.1
 
 EMI1.2
 

 <Desc / Clms Page number 2>

 sufficient to prevent the temperature from rising until gas evolution begins.



  A temperature of 20 tends to be dangerous. If, for example, gas begins to develop, the addition of acid is interrupted while cooling is continued. until the apparition ceases, after which it continues.



   The lye solidifies to a thick paste. There is no harm in using excess nitric acid, as in this case the mother liquor can be added during the next operation.



   The precipitate is filtered off with suction and, what is essential, has to be freed from adhering nitric acid by covering it with a pure, concentrated, aqueous solution of urea nitrate. If this does not happen, the preparation will decompose on drying.



   PATENT CLAIMS:
1. A method for the preparation of acidic urea by treatment of aqueous solutions of Cyanam @ l with nitric acid, characterized in that the addition of the acid takes place with a constant cooling of the reaction mixture and so slowly. that the temperature in the reaction mixture does not rise above 200.

Claims (1)

2. Ausführungsform des Verfahrens nach Anspruch l. dadurch gekennzeichnet. dass vor dem Trocknen des abgeschiedenen, salpetersauren Harnstoffes eme Waschung des Produktes mit einer reinen Harnstoftnitratlösung bis zur Beseitigung eines etwaigen Salpetersäure- überschusses erfolgt,. 2. embodiment of the method according to claim l. characterized. that before the separated nitric acid urea is dried, the product is washed with a pure urea nitrate solution until any excess nitric acid is eliminated.
AT69755D 1913-11-17 1913-11-17 Process for the preparation of nitric acid urea. AT69755B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT69755T 1913-11-17

Publications (1)

Publication Number Publication Date
AT69755B true AT69755B (en) 1915-09-10

Family

ID=3591568

Family Applications (1)

Application Number Title Priority Date Filing Date
AT69755D AT69755B (en) 1913-11-17 1913-11-17 Process for the preparation of nitric acid urea.

Country Status (1)

Country Link
AT (1) AT69755B (en)

Similar Documents

Publication Publication Date Title
AT69755B (en) Process for the preparation of nitric acid urea.
AT107314B (en) Process for the synthetic production of ammonia from the elements.
DE1768890C3 (en) Process for the preparation of 4-fluoro-3-nitroaniline
DE414257C (en) Process for the production of formic acid
AT153694B (en) Process for the production of ammonium persulphate from solutions by crystallization.
DE576697C (en) Process for the production of thiourea by the action of sulphides on calcium cyanamide
DE499523C (en) Process for the production of ª ‡ -oxy acids from their nitriles
DE445668C (en) Production of ammonium nitrate and blanc fixe
AT26685B (en) Process for the production of cyano compounds from gases containing cyano and ammonia.
AT95482B (en) Process for the production of urea from cyanamide.
CH98312A (en) Process for the preparation of 2: 3 diaminoanthraquinone.
DE955413C (en) Process for the production of hydrazine from hydroxylamine-O-sulfonic acid
AT211845B (en) Process for removing nitrous compounds from sulfuric acid
AT81462B (en) Process for the manufacture of guanylurea sulfate Process for the manufacture of guanylurea sulfate. t.
AT318657B (en) Process for the production of the new trisilver monoalkali (or alkaline earth, ammonium, quaternary ammonium) salts of diimidodioxosulfuric acid (VI) or the new tetrasilver diimidodioxosulfate (VI)
AT64081B (en) Process for the production of concentrated, low-ammonia copper oxide ammonia cellulose solutions.
AT136012B (en) Process for the preparation or regeneration of catalysts for the conversion of terpenes.
DE285259C (en)
AT128350B (en) Process for the preparation of low-electrolyte aqueous solutions of silk fibroin.
DE420638C (en) Process for the production of lead carbonate
DE592054C (en) Process for the preparation of formic acid
AT157699B (en) Method for the preparation of water-soluble organic mercury compounds.
DE921937C (en) Process for purifying adipic dinitrile
AT62171B (en) Process and preparation of ammonium sulfate.
DE426925C (en) Extraction of technically valuable products from sulfur barium