NL72707C - - Google Patents

Info

Publication number
NL72707C
NL72707C NL72707DA NL72707C NL 72707 C NL72707 C NL 72707C NL 72707D A NL72707D A NL 72707DA NL 72707 C NL72707 C NL 72707C
Authority
NL
Netherlands
Prior art keywords
adsorbent
bed
desorption
air
chamber
Prior art date
Application number
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.)
Publication of NL72707C publication Critical patent/NL72707C/xx

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00Nitrogen; Compounds thereof
    • C01B21/20Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
    • C01B21/36Nitrogen dioxide (NO2, N2O4)
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00Nitrogen; Compounds thereof
    • C01B21/20Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
    • C01B21/203Preparation of nitrogen oxides using a plasma or an electric discharge

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Treating Waste Gases (AREA)
  • Drying Of Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

<PICT:0644371/III/1> <PICT:0644371/III/2> Nitrogen dioxide (NO2) is recovered in concentrated form from a dry gas mixture containing nitrogen, oxygen and a small amount of NO2, by passing the mixture over dry adsorbent particles and heating the mass of NO2-containing solid adsorbent particles to desorption temperature by forcing through the mass a current of pure NO2 maintained at desorption temperature and recovering the NO2 so desorbed. In applying the process to the production of NO2 in concentrated form from a gaseous mixture comprising water vapour, oxygen and nitric oxide (NO) in low concentration, such as that produced in the fixation of atmospheric nitrogen, e.g. by the process of Specification 598,534, or by the oxidation of ammonia, the gas mixture is cooled in a tower B (Fig. 1) by a water or calcium nitrate solution spray, dehydrated in a bed E of a solid adsorbent, passed into a catalyst chamber F, wherein the NO content of the gas is oxidized to NO2 by contact with an adsorbent saturated with NO2, and the resulting NO2-containing gas is cooled at G before passing to an adsorber H containing solid adsorbent, the adsorbed NO2 being subsequently desorbed and recovered and the adsorbent being prepared for re-use. The adsorbent used in E, F and H may be silica gel, the residues resulting from acid leaching vermiculite or zeolites &c., alumina gel, titania gel or activated carbon, and may have cooling coils embedded therein. In the desorption step of Fig. 1, a mixture of air and NO2 is withdrawn from one end of adsorber H and circulated by pump J through a heat-interchanger I back into the opposite end of H, the transference of heat in this way, liberating about 70 per cent of adsorbed NO2, is continued until the bed has reached 165 DEG C., when pure (98 per cent) No2 is withdrawn and condensed or passed into a water tower for production of nitric acid, the NO produced being returned at E to the adsorption process. Further (25 per cent) NO2 is desorbed from H by circulating air, drawn through a drying bed R, in the circuit J, I, H and the gaseous mixture withdrawn therefrom is converted into nitric acid. Bed E is then dried by pumping air through R, I (at 180 DEG C.), valve 4 and E, and is cooled simultaneously with bed H by passing compressed air through R, G, H and E, venting to the atmosphere through valve 6. In continuous operation, a plurality of drying beds E and adsorption beds H are used, one bed each of E and H being operated in circuit while the others are being treated for re-use. In the embodiment shown in Fig. 3 comprising four communicating chambers U, V, W, X, through which finelydivided adsorbent particles are continuously being showered, the cool, dry gas mixture, after being oxidized, is passed into chamber U in counter-current flow to the adsorbent particles which remove the NO2 content of the gas. During its fall in chamber V, the NO2-laden adsorbent is heated to 165 DEG C. by contact with NO2 circulated through a pump J and heater I, and desorbed NO2 is bled off to a point for use. Further desorption occurs as the adsorbent descends through chamber W by contact with air (at 165 DEG C.) in countercurrent flow, and finally the adsorbent is cooled in chamber X by cool dry air and returned to a hopper Y. In a further modification (Fig. 4, not shown), desorption is effected without the use of a pump. The Specification as open to inspection under Sect. 91 comprises also effecting adsorption under pressure and desorption by using steam instead of hot NO2, by evacuation, or by passing a heating fluid through coils embedded in the adsorption beds, and using two adsorption beds (H) in series. This subject-matter does not appear in the Specification as accepted.
NL72707D 1943-09-08 NL72707C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US266634XA 1943-09-08 1943-09-08
US260944XA 1944-09-26 1944-09-26

Publications (1)

Publication Number Publication Date
NL72707C true NL72707C (en)

Family

ID=26700772

Family Applications (1)

Application Number Title Priority Date Filing Date
NL72707D NL72707C (en) 1943-09-08

Country Status (7)

Country Link
BE (1) BE473475A (en)
CH (1) CH266634A (en)
DE (1) DE935304C (en)
FR (2) FR946910A (en)
GB (1) GB644371A (en)
LU (1) LU28460A1 (en)
NL (1) NL72707C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1200793B (en) * 1959-01-23 1965-09-16 Mckee & Co Arthur G Process for the production of nitrogen dioxide by the oxidation of ammonia
FR2538020A1 (en) * 1982-12-16 1984-06-22 Morel Daniel Security closing device for doors
NO345196B1 (en) * 2018-10-25 2020-11-02 N2 Applied As Low pressure plasma reactor loop process and system
CN114074929B (en) * 2021-03-31 2023-03-31 浙江工业大学 Method and device for preparing nitric oxide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1391332A (en) * 1919-04-05 1921-09-20 Ralph H Mckee Process of oxidizing gases
US1836301A (en) * 1926-05-31 1931-12-15 Bechthold Friedrich Jakob Regenerating granular adsorbents
US1825707A (en) * 1927-05-24 1931-10-06 Silica Gel Corp Method of adsorbing a gas in a solid adsorbent

Also Published As

Publication number Publication date
CH266634A (en) 1950-02-15
FR964910A (en) 1950-08-29
FR946910A (en) 1949-06-17
DE935304C (en) 1955-11-17
GB644371A (en) 1950-10-11
LU28460A1 (en)
BE473475A (en)

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