DE340988C - Process for the absorption of nitrous vapors diluted in a large excess of nitrogen and oxygen by means of water - Google Patents

Process for the absorption of nitrous vapors diluted in a large excess of nitrogen and oxygen by means of water

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Publication number
DE340988C
DE340988C DE1920340988D DE340988DD DE340988C DE 340988 C DE340988 C DE 340988C DE 1920340988 D DE1920340988 D DE 1920340988D DE 340988D D DE340988D D DE 340988DD DE 340988 C DE340988 C DE 340988C
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DE
Germany
Prior art keywords
water
nitrogen
oxygen
absorption
large excess
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
DE1920340988D
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German (de)
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.)
L AZOTE FRANCAIS SA
Original Assignee
L AZOTE FRANCAIS SA
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 L AZOTE FRANCAIS SA filed Critical L AZOTE FRANCAIS SA
Application granted granted Critical
Publication of DE340988C publication Critical patent/DE340988C/en
Expired legal-status Critical Current

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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
    • C01B21/24—Nitric oxide (NO)
    • C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Gas Separation By Absorption (AREA)

Description

Nitrose Dämpfe, die in einem großen Stickstoff- und Sauerstoffüberschuß, auf das Volumen bezogen, z. B. in Mengen von 1 Prozent NO2 fein verteilt sind, werden durch Wasser ziemlich schwer absorbiert. Aus diesem Grunde ist es mit den für solche Zwecke bestimmten industriellen Apparaten (wie z. B. Rieseltürmen) kaum möglich, in bequemer Weise eine Salpetersäure von höherer Konzentration als 20· bis 30 Prozent HNO3 wiederzugewinnen.Nitrous vapors in a large excess of nitrogen and oxygen by volume, e.g. B. are finely divided in amounts of 1 percent NO 2 , are rather difficult to absorb by water. For this reason, it is hardly possible with the industrial apparatus (such as, for example, trickle towers) intended for such purposes to recover nitric acid in a concentration higher than 20 to 30 percent HNO 3 in a convenient manner.

Wohl können höhere Konzentrationen der Größenordnung von 50 Prozent erzielt werden (vgl. Do nath &, Frenz el, Die technische Ausnutzung . des atmosphärischen Stickstoffs, 1907, S. 149 und 150). Dies erfordert jedoch, daß die verdünnte Salpetersäure längere Zeit hindurch im Turme in Umlauf erhalten wird.Higher concentrations of the order of magnitude of 50 percent can certainly be achieved (cf. Do nath &, Frenz el, The technical exploitation of atmospheric nitrogen, 1907, pp. 149 and 150). However, this requires that the dilute nitric acid be kept in circulation in the tower for a long time.

Es hat sich herausgestellt, diaß, wenn in den Gasstrom faserige, mit Wasser getränkte Substanzen, wie z. B. Glaswolle und Baumwolle, eingeschaltet werden, daß dann in diesem Falle infolge von Adsorptionsvorgängen in viel leichterer Weise als sonst eine konzentrierte Salpetersäure gewonnen werden kann, welche bis 50 und 55 Prozent NO3H enthält. It has been found that if fibrous substances soaked with water, such as e.g. B. glass wool and cotton, so that in this case, as a result of adsorption processes, a concentrated nitric acid containing up to 50 and 55 percent NO 3 H can be obtained in a much easier way than usual.

Auf dieser Beobachtung beruht das nachfolgend beschriebene Verfahren:The procedure described below is based on this observation:

Das geringe Mengen nitroser Dämpfe enthaltende Stickstoff- und Sauerstoffgemisch wird hindurchgeleitet durch Apparate (Türme, Reaktionskammern), welche mit Wasser durchtränkte, faserige Substanzen enthalten. Beim Durchströmen der Gase nimmt dieses Wasser Salpetersäure auf.The nitrogen and oxygen mixture containing small amounts of nitrous vapors is passed through apparatus (towers, reaction chambers) which contain fibrous substances soaked with water. As the gases flow through, this water absorbs nitric acid.

Die Operation kann intermittierend durchgeführt werden und die gebildete Säure durch Ausschleudern, Ausdrücken, Abtröpfelnlassen abgeschieden werden. Die Operation kann aber auch kontinuierlich vor sich gehen, indem man in den die faserigen Substanzen enthaltenden oberen Teil des Apparates einen dünnen Wasserstrom einleitet, während am unteren Teile die die Salpetersäure enthaltende Lösung aufgefangen wird.The operation can be performed intermittently and the acid formed separated by centrifuging, squeezing, dripping. The operation but can also go on continuously by putting in the fibrous substances containing the upper part of the apparatus introduces a thin stream of water, while at the lower part the nitric acid containing solution is collected.

Als faserige Substanz kann jeder diese Struktur aufweisende Körper Verwendung finden, welcher durch Salpetersäure nicht angegriffen oder durch diese Säure bei mittlerer Konzentration wenig angegriffen wird. Zu diesen Körpern gehören z. B. Glaswolle und Asbestfäden. Baumwolle kann verwendet werden, wenn ein Gehalt von 50 Prozent NOoH nicht überschritten wird.Any body having this structure can be used as the fibrous substance find which is not attacked by nitric acid or by this acid at medium Concentration is little affected. These bodies include, for. B. Glass wool and Asbestos threads. Cotton can be used if it has a content of 50 percent NOoH is not exceeded.

Diese Stoffe können allein oder in Kombination Verwendung finden.These substances can be used alone or in combination.

Claims (2)

Patent-Ansprüche:Patent Claims: i. Verfahren zur Absorption von in einem großen Stickstoff- und Sauerstoffüberschuß verdünnten nitrosen Dämpfen mittels Wassers, darin bestehend, daß diei. Process for the absorption of nitrous vapors diluted in a large excess of nitrogen and oxygen by means of water, consisting in that the Gase mit wassergetränkten, faserigen Stoffen, die durch die zu gewinnende Salpetersäure praktisch nicht angegriffen werden, in Berührung gebracht werden.Gases with water-soaked, fibrous substances caused by the nitric acid to be obtained practically not attacked, brought into contact. 2. Verfahren nach Anspruch i, darin bestehend, daß als faserige Stoffe Glaswolle, Asbestfäden oder Baumwolle, einzeln für sich oder in beliebiger Kombination, verwendet werden.2. The method according to claim i, consisting in that, as fibrous substances, glass wool, Asbestos threads or cotton, individually or in any combination, be used.
DE1920340988D 1919-10-08 1920-09-23 Process for the absorption of nitrous vapors diluted in a large excess of nitrogen and oxygen by means of water Expired DE340988C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH152031X 1919-10-08

Publications (1)

Publication Number Publication Date
DE340988C true DE340988C (en) 1921-09-20

Family

ID=4407214

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1920340988D Expired DE340988C (en) 1919-10-08 1920-09-23 Process for the absorption of nitrous vapors diluted in a large excess of nitrogen and oxygen by means of water

Country Status (2)

Country Link
DE (1) DE340988C (en)
GB (1) GB152031A (en)

Also Published As

Publication number Publication date
GB152031A (en) 1921-09-29

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