DE301751C - - Google Patents
Info
- Publication number
- DE301751C DE301751C DENDAT301751D DE301751DC DE301751C DE 301751 C DE301751 C DE 301751C DE NDAT301751 D DENDAT301751 D DE NDAT301751D DE 301751D C DE301751D C DE 301751DC DE 301751 C DE301751 C DE 301751C
- Authority
- DE
- Germany
- Prior art keywords
- ammonia
- iron
- excess
- expediently
- urea
- 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.)
- Active
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000011541 reaction mixture Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- BVCZEBOGSOYJJT-UHFFFAOYSA-N Ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- PRKQVKDSMLBJBJ-UHFFFAOYSA-N Ammonium carbonate Chemical compound N.N.OC(O)=O PRKQVKDSMLBJBJ-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- -1 cast iron Chemical compound 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N tin hydride Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
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
Description
Bei der !Darstellung von Harnstoff durch . Erhitzen von Kohlensäureverbindungen des Ammoniaks im geschlossenen Gefäß haben sich beim Gebrauch metallischer, insbesondere eiserner Apparate Schädigungen des Materials, namentlich in den schwer auszukleidenden Leitungen, bemerkbar gemacht. 'With the! Representation of urea through. Heating of carbonic acid compounds of the Ammonia in the closed vessel have become metallic, in particular with use Iron apparatus Damage to the material, especially in those that are difficult to dress Lines, made noticeable. '
Es hat sich nun gezeigt, daß man diesen Schädigungen dadurch begegnen kann, daß, ίο man für Beseitigung des anfangs im Apparate befindlichen Sauerstoffs sowie 'für dessen Fernhaltung bei der Beschickung sorgt oder einen Überschuß an Ammoniak im Reaktionsgemisch verwendet oder zweckmäßig gleichzeitig beide Maßnahmen trifft.It has now been shown that this damage can be countered by: ίο one for eliminating the beginning in the apparatus the oxygen present as well as' ensures that it is kept away during loading or an excess of ammonia is used in the reaction mixture or expediently at the same time takes both measures.
Um den Sauerstoff fern zu halten, spültTo keep the oxygen out, flush
man beispielsweise die Apparatur zunächst mit Stickstoff aus und bringt gegebenenfalls . auch das einzufüllende Salz, ζ. B.' ein Gemisch von Ammoniumcarbonat und Ammoniumcarbamat, im luftfre.ien Zustand in das Druckgefäß. Wenn eine vorherige Ein-Schmelzung des Salzes in einem besonderen Schmelzkessel vorgenommen wird, so ist auch in diesem für die Abwesenheit von Luft zu sorgen.for example, the apparatus is initially purged with nitrogen and, if appropriate, brought . also the salt to be filled, ζ. B. ' a mixture of ammonium carbonate and ammonium carbamate, in the air-free state in the pressure vessel. If a previous one-melting of the salt is made in a special melting kettle, so is it in this to ensure the absence of air.
Für einen Überschuß an Ammoniak sorgt man in der Weise, daß man bei der Beschikkung der Apparate nicht das theoretische Verhältnis (2NH3: 1CO2) innehält, sondern . z. B. 5 Prozent oder mehr Ammoniak darüber hinaus anwendet. Desgleichen ist auch im weiteren Verlauf dafür Sorge zu tragen, daß ein solcher Überschuß dauernd vorhanden ist.An excess of ammonia is ensured in such a way that the theoretical ratio (2NH 3 : 1CO 2 ) is not maintained when the apparatus is charged, but rather. z. B. also applies 5 percent or more ammonia. Likewise, care must also be taken in the further course that such an excess is permanently present.
Das vorliegende Verfahren bezieht sich in erster Linie auf die Verwendung aller Sorten Eisen, wie Gußeisen, Schmiedeeisen, gewöhnlichen Stahl sowie aller Edel- öder Spezialstähle^ Eisenlegierungen oder -verbindungen, ζ. B. Ferrosilicium, aber auch auf die Verwendung solcher Metalle, welche, wie Blei und Zinn Oder ihre Legierungen, besonders zum Auskleiden und Schutz von eisernen Leitungen oder Apparaturteilen üblich und anwendbar sind.The present procedure relates primarily to the use of all varieties Iron, such as cast iron, wrought iron, ordinary steel, and all precious or special steels Iron alloys or compounds, ζ. B. ferrosilicon, but also the use of metals such as lead and tin or their alloys, especially for lining and protecting iron Lines or pieces of equipment are common and applicable.
Das Verfahren ist von besonderer Bedeutung, wenn man mit Apparaten arbeitet, die umfangreiche Leitungen oder besonders empfindliche Teile, z. B\ Ventile oder Kolbenringe, enthalten, wie dies z.B. bei dem Verfahren des Patents 301279 der Fall ist.The procedure is of particular importance when working with apparatus that extensive lines or particularly sensitive parts, e.g. B \ valves or piston rings, as is the case, for example, with the method of patent 301279.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE301751C true DE301751C (en) |
Family
ID=555600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT301751D Active DE301751C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE301751C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1015787B (en) * | 1953-01-21 | 1954-09-19 | Pechiney Prod Chimiques Sa | Process for the removal of oxygen admixtures from the gases used as starting material for the synthesis of urea |
| DE953876C (en) * | 1953-04-15 | 1956-12-06 | Stamicarbon | Process for the production of urea |
| DE1034617B (en) * | 1952-10-25 | 1958-07-24 | Chemical Construction Corp | Process for the production of urea |
-
0
- DE DENDAT301751D patent/DE301751C/de active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1034617B (en) * | 1952-10-25 | 1958-07-24 | Chemical Construction Corp | Process for the production of urea |
| DE1015787B (en) * | 1953-01-21 | 1954-09-19 | Pechiney Prod Chimiques Sa | Process for the removal of oxygen admixtures from the gases used as starting material for the synthesis of urea |
| DE953876C (en) * | 1953-04-15 | 1956-12-06 | Stamicarbon | Process for the production of urea |
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