DE95885C - - Google Patents
Info
- Publication number
- DE95885C DE95885C DENDAT95885D DE95885DA DE95885C DE 95885 C DE95885 C DE 95885C DE NDAT95885 D DENDAT95885 D DE NDAT95885D DE 95885D A DE95885D A DE 95885DA DE 95885 C DE95885 C DE 95885C
- Authority
- DE
- Germany
- Prior art keywords
- lead
- pyrite
- nitrite
- reduction
- nitrates
- 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
- 238000000034 method Methods 0.000 claims description 5
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 5
- 229910052683 pyrite Inorganic materials 0.000 claims description 5
- 239000011028 pyrite Substances 0.000 claims description 5
- 239000003518 caustics Substances 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims 1
- 229910001963 alkali metal nitrate Inorganic materials 0.000 claims 1
- -1 alkali metal nitrites Chemical class 0.000 claims 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N Potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 5
- VWDWKYIASSYTQR-UHFFFAOYSA-N Sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 3
- 150000002823 nitrates Chemical class 0.000 description 3
- 239000004323 potassium nitrate Substances 0.000 description 3
- 235000010333 potassium nitrate Nutrition 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052949 galena Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910000460 iron oxide Inorganic materials 0.000 description 2
- 150000002611 lead compounds Chemical class 0.000 description 2
- 150000002826 nitrites Chemical class 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000005712 crystallization Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/50—Nitrous acid; Salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
PATENTAPATENTA
Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Darstellung von Alkalinitriten und beruht auf der Reduction von Alkalinitraten durch Pyrit in Gegenwart von Aetzalkalien.The present invention relates to a method for displaying alkali nitrites and is based on the reduction of alkali nitrates by pyrite in the presence of caustic alkalis.
Im Allgemeinen werden Nitrite durch Reduction von Nitraten hergestellt. Als reducirende Mittel sind die verschiedensten Agenden zur Verwendung gelangt, z. B. metallisches Blei, Bleiglanz und ähnliche Bleiverbindungen. Sämmtliche auf der Anwendung von Blei bezw. Bleiglanz beruhende Verfahren haben jedoch den Nachtheil, dafs sie eine schlechte Ausbeute an Nitrit ergeben oder mit anderen Worten, dafs ein grofser Verlust von Salpeter im Verlauf der Reaction stattfindet. So zeigte es sich zum Beispiel, dafs bei einem von Bertsch und Harmsen vorgeschlagenen Verfahren (D. R. P. Nr. 59228), welches auf der Reduction von Natriumnitrat durch Bleiglanz bei Gegenwart von Alkali- oder Erdalkalioxyden beruht, nur ca. 46 pCt. Salpeter in Nitrit umgewandelt werden, während 26 pCt. Salpeter unzersetzt bleiben und durch vollständige Reduction verloren gehen. Hierzu kommt noch, dafs bei der Verwendung von Blei oder Bleiverbindungen die Lösungen durch die Löslichkeit von Blei verunreinigt werden, dessen Entfernung durch Einleiten von Kohlensäure etc. weitere Kosten und weitere Nitritverluste verursacht.In general, nitrites are produced by reducing nitrates. As a reducing Funds have been used on a wide variety of agendas, e.g. B. metallic lead, Lead luster and similar lead compounds. All on the application of lead resp. Processes based on galena, however, have the disadvantage that they are poor in yield of nitrite, or, in other words, that there is a great loss of saltpetre in the course of the process the reaction takes place. So it turned out, for example, that this was the case with one of Bertsch's and Harmsen proposed method (D. R. P. No. 59228) which is based on the Reduction of sodium nitrate due to galena in the presence of alkali or alkaline earth oxides, only approx. 46 pct. Saltpetre can be converted into nitrite, while 26 pCt. Undecomposed saltpetre remain and are lost through complete reduction. In addition there is that the use of lead or lead compounds due to the solubility of the solutions Lead can be contaminated, its removal by introducing carbon dioxide etc. further Caused costs and further nitrite losses.
Zur Vermeidung dieser Uebelstände wurde das folgende Verfahren erdacht, das überdies eine bisher noch nicht erreichte Ausbeute an Nitrit ergiebt, indem diese fast der theoretischen Ausbeute gleichkommt. Das Verfahren beruht, wie im Eingange bemerkt, auf der Reduction von Nitraten durch Pyrite bei Gegenwart von Aetzalkalien und wird in der Praxis wie folgt ausgeführt:In order to avoid these inconveniences, the following procedure was devised, which is, moreover, one Hitherto unattained yield of nitrite results in this being almost the theoretical yield equals. As noted at the beginning, the process is based on the reduction of nitrates by pyrite in the presence of caustic alkalis and is carried out in practice as follows:
Etwa 10 Gewichtstheile salpetersaures Natron (oder Kali) und 11 1/2 Theile Aetznatron (oder Kali) von 90 pCt. werden in wenig Wasser zu einer concentrirten Flüssigkeit gelöst, zu der Lösung werden unter fortwährendem Umrühren 2,25 Theile Pyrit in gepulverter Form gegeben, dann eingedampft bis zur vollständigen Entfernung des Wassers und eintretender Schmelzung. Schwefel und Eisen des Pyrits oxydiren sich hierbei auf Kosten eines Theils des Sauerstoffs der Salpetersäure, welche zu salpetriger Säure reducirt wird. Die Reaction vollzieht sich glatt unter mäfsigem Aufschäumen, so dafs man fast theoretische Ausbeuten erhält.About 10 weight parts of nitrate of soda (or potassium) and 11 1/2 parts of caustic soda (or potassium) of 90 per cent. are dissolved in a little water to form a concentrated liquid; 2.25 parts of pyrite in powdered form are added to the solution, with continuous stirring, and then evaporated until the water is completely removed and melting occurs. The sulfur and iron of pyrite are oxidized at the expense of part of the oxygen in nitric acid, which is reduced to nitrous acid. The reaction takes place smoothly with moderate foaming, so that almost theoretical yields are obtained.
Die entstandenen Salze: salpetrigsaure und schwefelsaure Alkalien werden zunächst durch Auflösen der erkalteten Schmelze in Wasser vom gebildeten Eisenoxyd und dann von einander durch Kryställisation getrennt.The resulting salts: nitrous acid and sulfuric acid alkalis are initially through Dissolve the cooled melt in water from the iron oxide formed and then from each other separated by crystallization.
Abgesehen von der bereits erwähnten, fast theoretischen Ausbeute an Nitrit bildet der Umstand einen weiteren Vortheil des vorliegenden Verfahrens, dafs das Eisenoxyd in den Lösungen vollständig unlöslich ist und daher keine besonderen Mafsnahmen und Extrakosten für seine Entfernung veranlafst.Apart from the already mentioned, almost theoretical yield of nitrite, the circumstance forms Another advantage of the present method is that the iron oxide in the solutions is completely insoluble and therefore no special measures and extra costs for cause its removal.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE95885C true DE95885C (en) |
Family
ID=367078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT95885D Active DE95885C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE95885C (en) |
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0
- DE DENDAT95885D patent/DE95885C/de active Active
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