DE958381C - Process for the conversion of nitrites into nitrates - Google Patents

Process for the conversion of nitrites into nitrates

Info

Publication number
DE958381C
DE958381C DEP15297A DEP0015297A DE958381C DE 958381 C DE958381 C DE 958381C DE P15297 A DEP15297 A DE P15297A DE P0015297 A DEP0015297 A DE P0015297A DE 958381 C DE958381 C DE 958381C
Authority
DE
Germany
Prior art keywords
nitric acid
oxygen
nitrates
nitrate
nitrites
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
Application number
DEP15297A
Other languages
German (de)
Inventor
Dr-Ing Heinz Lehmann
Dipl-Ing Georg Von Semel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pintsch Bamag AG
Original Assignee
Pintsch Bamag 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 Pintsch Bamag AG filed Critical Pintsch Bamag AG
Priority to DEP15297A priority Critical patent/DE958381C/en
Application granted granted Critical
Publication of DE958381C publication Critical patent/DE958381C/en
Expired legal-status Critical Current

Links

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
    • C01B21/38—Nitric acid
    • C01B21/46—Purification; Separation ; Stabilisation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D9/00—Nitrates of sodium, potassium or alkali metals in general

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Removal Of Specific Substances (AREA)

Description

Es ist bekannt, daß Natriumnitrit durch Salpetersäure in Natriumnitrat übergeführt werden kann, wobei die zugegebene Salpetersäure zersetzt wird und als Stickoxyd entweicht:It is known that sodium nitrite is converted into sodium nitrate by nitric acid can, whereby the added nitric acid is decomposed and escapes as nitrogen oxide:

3 NaNO2+ 2HNO3 = 3NaNO3+ H2O+ NO3 NaNO 2 + 2HNO 3 = 3NaNO 3 + H 2 O + NO

Das bei diesem Prozeß entstandene Stickoxyd kann aufoxydiert und zurückgewonnen werden.The nitrogen oxide produced in this process can be oxidized and recovered.

Es liegen Verfahren vor, nach denen dieser Prozeß durch Zugabe von Luft oder wenig Sauerstoff durchgeführt wird:There are methods in which this process is carried out by adding air or a little oxygen is carried out:

3NaNO2+ 2HNO3 = 3 NaNO3+ H2O+2 NO;3NaNO 2 + 2HNO 3 = 3 NaNO 3 + H 2 O + 2 NO;

Durch Versuche wurde erfindungsgemäß festgestellt, daß die Reaktion in Gegenwart einer kleinen Menge Salpetersäure nach folgenden Gleichungen vor sich geht:Experiments were found according to the invention that the reaction in the presence of a small amount of nitric acid is done according to the following equations:

NaNO2+ HNO3 = NaNO3+ HNO2 (i)
2 HNO2+ O2 = 2 HNO3 (2)NaNO 2 + HNO 3 = NaNO 3 + HNO 2 (i)
2 HNO 2 + O 2 = 2 HNO 3 (2)

Bei diesem Prozeß wird Sauerstoff in der theoretischen Menge nach der obigen Gleichung (2) verbraucht. Die Salpetersäure der Reaktionsgleichung (1), deren Menge gering sein kann, dient lediglich dazu, eine gewisse Menge salpetrige Säure zu bilden, welche mit dem Sauerstoff zu Salpetersäure oxydiert, wird.In this process, oxygen is used in the theoretical Amount consumed according to the above equation (2). The nitric acid of the reaction equation (1), the amount of which can be small, only serves to add a certain amount of nitrous acid to form, which is oxidized with the oxygen to nitric acid.

Diese neugebildete Salpetersäure reagiert wiederum mit Natriumnitrit unter Bildung von Nitrat usf. Auf Grund dieses Ergebnisses ist das vor-This newly formed nitric acid in turn reacts with sodium nitrite to form nitrate etc. On the basis of this result, this is

liegende Verfahren entwickelt worden, nach dem man nitrithaltige Lösungen, die z. B. bei der alkalischen Absorption von Stickoxydgasen anfallen, mit Leichtigkeit in Nitrat überführen kann.
Nach diesem Verfahren werden in Gegenwart von Salpetersäure nitriühaltige Lösungen in einem Autoklav bei höheren Temperaturen und Drücken mit Sauerstoff behandelt. Nach kurzer Reaktionszeit gehen dabei die Nitrite nahezu vollständig inlying method has been developed, after which nitrite solutions that z. B. incurred in the alkaline absorption of nitrogen oxide gases, can be converted into nitrate with ease.
According to this process, solutions containing nitric acid are treated with oxygen in an autoclave at higher temperatures and pressures in the presence of nitric acid. After a short reaction time, the nitrites are almost completely absorbed

ίο Nitrate über.ίο nitrates over.

- Das Verfahren benötigt im Gegensatz zu den bekannten Verfahren nur eine geringe Menge Salpetersäure und ist überall dort, wo Sauerstoff zur Verfügung steht, wirtschaftlich und einfach durchzuführen. - In contrast to the known processes, the process only requires a small amount of nitric acid and can be carried out economically and easily wherever oxygen is available.

BeispieleExamples

i. Eine 23,3°/oige Natriumnitritlösung wurde mit ι % Salpetersäure versetzt und bei ioo° und 5 atü ao mit Sauerstoff behandelt. Nach 2 Stunden war das Nitrit zu 99% zu Nitrat oxydiert.i. A 23.3% sodium nitrite solution was with ι% nitric acid added and at 100 ° and 5 atm ao treated with oxygen. After 2 hours the nitrite was 99% oxidized to nitrate.

2. Eine Lösung, bestehend aus 20% Nitrit, 20% Nitrat und 60% Wasser, wurde mit 1% Salpetersäure versetzt und bei ioo° und 5 atü mit Sauerstoff behandelt. Nach 2 Stunden Reaktionszeit war das Nitrit gleichfalls zu 991Vo Nitrat umgesetzt.2. A solution consisting of 20% nitrite, 20% nitrate and 60% water was mixed with 1% nitric acid and treated with oxygen at 100 ° and 5 atm. After a reaction time of 2 hours, the nitrite had also converted to 99 1 Vo of nitrate.

Mit gleichem Erfolg ließ sich eine 10% Nitrat und ro°/o Nitrit enthaltende Lösung in eine Nitratlösung überführen.A solution containing 10% nitrate and roughly nitrite could be converted into a nitrate solution with the same success convict.

Claims (1)

PATENTANSPRUCH:PATENT CLAIM: Verfahren zur Überführung von Nitriten in Nitrate durch Umsetzung von wäßrigen nitrithaltigen Lösungen mit Salpetersäure, dadurch gekennzeichnet, daß die Lösungen in Gegenwart von geringen Mengen Salpetersäure, vorzugsweise 0,5 bis 1%, bei einem Druck von über 2 atü und Temperaturen von 700 und darüber mit Sauerstoff behandelt werden.Process for converting nitrites into nitrates by reacting aqueous nitrite-containing solutions with nitric acid, characterized in that the solutions in the presence of small amounts of nitric acid, preferably 0.5 to 1%, at a pressure of over 2 atmospheres and temperatures of 70 0 and treated with oxygen. ©609 580/419 8.56 (609 802 2.57)© 609 580/419 8.56 (609 802 2.57)
DEP15297A 1955-12-09 1955-12-10 Process for the conversion of nitrites into nitrates Expired DE958381C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP15297A DE958381C (en) 1955-12-09 1955-12-10 Process for the conversion of nitrites into nitrates

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1160225X 1955-12-09
DEP15297A DE958381C (en) 1955-12-09 1955-12-10 Process for the conversion of nitrites into nitrates

Publications (1)

Publication Number Publication Date
DE958381C true DE958381C (en) 1957-02-21

Family

ID=25989796

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP15297A Expired DE958381C (en) 1955-12-09 1955-12-10 Process for the conversion of nitrites into nitrates

Country Status (1)

Country Link
DE (1) DE958381C (en)

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