DE449606C - Production of concentrated nitrous gases - Google Patents

Production of concentrated nitrous gases

Info

Publication number
DE449606C
DE449606C DEI28326D DEI0028326D DE449606C DE 449606 C DE449606 C DE 449606C DE I28326 D DEI28326 D DE I28326D DE I0028326 D DEI0028326 D DE I0028326D DE 449606 C DE449606 C DE 449606C
Authority
DE
Germany
Prior art keywords
gases
nitrous gases
production
concentrated
nitrous
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
DEI28326D
Other languages
German (de)
Inventor
Dr Robert Griessbach
Dr Otto Schliephake
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI28326D priority Critical patent/DE449606C/en
Application granted granted Critical
Publication of DE449606C publication Critical patent/DE449606C/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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Description

Gewinnung konzentrierter nitroser Gase. Bei der Gewinnung konzentrierter nitroser Gase aus verdünnten nitrosen Gasen durch Tiefkühlung mittels verflüssigter Gase hat man bisher das Kühlmittel und die nitrosen Gase in getrennten Systemen geführt, wobei die in fester Form abgeschiedenen Stickoxyde sich in stets zunehmender Schichtdicke an der Innenfläche der Kühlerwand abscheiden und dadurch einen vollkommenenWärmeaustausch verhindern.Production of concentrated nitrous gases. More concentrated in the extraction nitrous gases from dilute nitrous gases by freezing using liquefied ones Gases, the coolant and the nitrous gases have so far been in separate systems out, with the nitrogen oxides deposited in solid form increasing in size Deposits layer thickness on the inner surface of the cooler wall and thereby a perfect heat exchange impede.

Es wurde gefunden, daß man dies vermeiden kann, wenn man die verdünnten nitrosen Gase unmittelbar mit verflüssigten Gasen, z. B. flüssiger Luft, in Berührung bringt. Dabei erzielt man einen vollkommenen Wärmeaustausch, und die nitrosen Gase werden in fester, leicht filtrierbarer Form gewonnen. Das Verfahren bietet außerdem den Vorteil, daß die Oxydation der Stickoxyde bei den tiefen Temperaturen sehr schnell und nahezu quantitativ verläuft, so daß die Verluste äußerst gering sind.It has been found that this can be avoided by using the diluted nitrous gases directly with liquefied gases, e.g. B. liquid air, in contact brings. A complete heat exchange is achieved, and the nitrous gases are obtained in a solid, easily filterable form. The procedure also offers the advantage that the oxides of nitrogen oxidize very quickly at low temperatures and runs almost quantitatively, so that the losses are extremely small.

Zweckmäßig werden die verdünnten nitrosen Gase durch Vorkühlung von Feuchtigkeit und Salpetersäure befreit.The diluted nitrous gases are expedient by precooling Freed moisture and nitric acid.

Um ein Verstopfen des Zuleitungsrohres durch in fester Form abgeschiedene Stickoxyde zu verhindern, gestaltet man es zweckmäßig doppelwandig und füllt den dadurch gebildeten Hohlraum mit einem Wärmeisolator, z. B. Kieselgur o. dgl. Man kann aber auch den Gasstrom aus einer Düse, die, zweckmäßig mittels elektrischer Heizung, auf etwa -d.o° C gehalten wird, um ein Zufrieren zu vermeiden, auf die Oberfläche des verflüssigten Gases blasen. Auch hierbei scheiden sich die nitrosen Gase infolge der starken Abkühlung als leicht filtrierbarer, fester Körper aus.To prevent clogging of the supply pipe by deposited in solid form To prevent nitrogen oxides, it is practical to make it double-walled and fill the thereby formed cavity with a heat insulator, for. B. Kieselguhr or the like. Man but can also the gas flow from a nozzle, which, expediently by means of electrical Heating, is kept at about -d.o ° C to avoid freezing on the Blow the surface of the liquefied gas. Here, too, the nitrous is different Gases out as an easily filterable, solid body as a result of the strong cooling.

Man kann z. B. so arbeiten, daß man die in beliebiger Weise gewonnenen, verdünnten nitrosen Gase kontinuierlich mit demKühlmittel in unmittelbareBerührung bringt und zeit-@veise oder dauernd filtriert, wobei aus dem mit festen Stickoxyden gefüllten Filtrationsgefäß durch langsames Erwärmen die nitrosen Gase in konzentrierter Form gewonnen werden können.You can z. B. work in such a way that one obtains the diluted nitrous gases continuously in direct contact with the coolant brings and filtered occasionally or continuously, with solid nitrogen oxides filled filtration vessel by slowly heating the nitrous gases in concentrated Form can be obtained.

Zweckmäßig wird das verdampfte Kühlmittel zusammen mit den tiefgekühlten, stick-Z> Abgasen zur Vorkühlung der verdünnten nitrosen Gase verwendet. B ei sp i@el. Durch ein wärmeisoliertes Rohr wird ein Gasgemisch von i Teil nitrosen Gasen und und ro Teilen Luft unmittelbar in flüssige Luft geleitet. Die ausgeschiedenen festen Stickoxyde werden in einem verschließbaren Filterefäß abfiltriert. Durch langsames Er-Z., wärmen mittels heißer Luft erhält man daraus ein Gas, das aus 98,6 Prozent NOZ und 44 Prozent NO besteht.The evaporated coolant is expediently used together with the deep-frozen, stick-Z> exhaust gases to pre-cool the diluted nitrous gases. Example. A gas mixture of 1 part nitrous gases and 1 part air is fed directly into liquid air through a heat-insulated pipe. The precipitated solid nitrogen oxides are filtered off in a lockable filter vessel. Slow heating with hot air produces a gas that consists of 98.6 percent NOZ and 44 percent NO.

Claims (1)

PATENTANSPRUCH: Verfahren zur Gewinnung konzentrierter nitroser Gase aus verdünnten nitrosen Gasen durch Tiefkühlung mittels verflüssigter Gase, dadurch gekennzeichnet, daß man die stickoxydhaltigen Gase durch unmittelbare Berührung mit dem verflüssigten Gas, insbesondere flüssiger Luft, in fester Form abscheidet und sodann durch Filtration von dem Kühlmittel trennt.PATENT CLAIM: Process for the production of concentrated nitrous gases from diluted nitrous gases by deep-freezing by means of liquefied gases, thereby characterized in that the nitrogen oxide-containing gases by direct contact with the liquefied gas, in particular liquid air, is deposited in solid form and then separated from the coolant by filtration.
DEI28326D 1926-06-17 1926-06-17 Production of concentrated nitrous gases Expired DE449606C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI28326D DE449606C (en) 1926-06-17 1926-06-17 Production of concentrated nitrous gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI28326D DE449606C (en) 1926-06-17 1926-06-17 Production of concentrated nitrous gases

Publications (1)

Publication Number Publication Date
DE449606C true DE449606C (en) 1927-09-17

Family

ID=7186996

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI28326D Expired DE449606C (en) 1926-06-17 1926-06-17 Production of concentrated nitrous gases

Country Status (1)

Country Link
DE (1) DE449606C (en)

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