DE434401C - Process for the production of pure urea - Google Patents
Process for the production of pure ureaInfo
- Publication number
- DE434401C DE434401C DEB116554D DEB0116554D DE434401C DE 434401 C DE434401 C DE 434401C DE B116554 D DEB116554 D DE B116554D DE B0116554 D DEB0116554 D DE B0116554D DE 434401 C DE434401 C DE 434401C
- Authority
- DE
- Germany
- Prior art keywords
- urea
- production
- pure urea
- pure
- ammonia
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
- C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
- C07C273/14—Separation; Purification; Stabilisation; Use of additives
- C07C273/16—Separation; Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von reinem Harnstoff. Technisch gewonnener Harnstoff ist infolge des Angriffs auf die Apparatur in der Regel mehr oder weniger stark, insbesondere durch Eisenoxyde und andere Metallverbindungen verunreinigt und daher gelbrot bis braun gefärbt. Zur Erzielung eines reinen Produktes mußte der Harnstoff erst umgelöst und mit Tierkohle gereinigt werden.Process for the production of pure urea. Technically won As a result of the attack on the apparatus, urea is usually more or less heavily contaminated, especially by iron oxides and other metal compounds and therefore yellow-red to brown in color. To obtain a pure product you had to the urea must first be redissolved and cleaned with animal charcoal.
Es hat sich nun gezeigt, daß man reinen, weißen Harnstoff aus dem technischen Produkt erhalten kann, wenn man die konzentrierten Harnstofflösungen bei Anwesenheit von Ammoniak mit Oxydationsmitteln behandelt. Im allgemeinen genügen schon geringe Mengen Ammoniak, mindestens soll aber etwa % bis z Prozent zugegen sein. Als Oxydationsmittel kommen beispielsweise Luft, Sauerstoff, Braunstein usw. in Frage, die zweckmäßig den Lösungen in feiner Verteilung zugeführt werden. Die Oxydation und die darauffolgende Entfernung der niedergeschlagenen Verunreinigungen kann schon bei verhältnismäßig niedriger Temperatur, z. B. bei 6o bis 70°, und in kurzer Zeft und daher auch ohne merkliche Harnstoffverluste infolge Verseifung ausgeführt werden.It has now been shown that pure, white urea can be extracted from the technical product can be obtained by using the concentrated urea solutions treated with oxidizing agents in the presence of ammonia. Generally enough even small amounts of ammonia, but at least about% to z percent should be present be. Air, oxygen, manganese dioxide, etc., can be used as oxidizing agents. in question, which are expediently fed to the solutions in fine distribution. the Oxidation and the subsequent removal of the deposited impurities can even at a relatively low temperature, e.g. B. at 6o to 70 °, and in short term and therefore carried out without any noticeable loss of urea due to saponification will.
Die Fällung insbesondere der Schwermetallv erbindungen ist unter diesen Umständen praktisch quantitativ, und der ausgeschiedene Niederschlag besitzt gut filtrierbare Form, so daß er leicht abgetrennt werden kann. Nach der Filtration durch Nutsche, Filterpresse oder durch Abschleudern in einer Überlaufzentrifuge erhält man eine klare, wasserhelle Lösung, die beim Auskristallisieren oder völligen Verdampfen einen reinen, schneeweißen Harnstoff liefert.Precipitation of heavy metal compounds in particular is among these Circumstances practically quantitative, and the precipitated precipitate has good filterable form so that it can be easily separated. After filtration by suction filter, filter press or by centrifuging in an overflow centrifuge a clear, water-white solution is obtained that crystallizes out or becomes complete Vaporizing provides a pure, snow-white urea.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB116554D DE434401C (en) | 1924-11-16 | 1924-11-16 | Process for the production of pure urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB116554D DE434401C (en) | 1924-11-16 | 1924-11-16 | Process for the production of pure urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE434401C true DE434401C (en) | 1926-09-30 |
Family
ID=6994330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB116554D Expired DE434401C (en) | 1924-11-16 | 1924-11-16 | Process for the production of pure urea |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE434401C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE928947C (en) * | 1953-05-31 | 1955-06-16 | Basf Ag | Process for removing lead from urea solutions containing such |
-
1924
- 1924-11-16 DE DEB116554D patent/DE434401C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE928947C (en) * | 1953-05-31 | 1955-06-16 | Basf Ag | Process for removing lead from urea solutions containing such |
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