GB671421A - Improvements in and relating to production of nitrogen or nitrogen-hydrogen mixtures - Google Patents

Improvements in and relating to production of nitrogen or nitrogen-hydrogen mixtures

Info

Publication number
GB671421A
GB671421A GB21036/49A GB2103649A GB671421A GB 671421 A GB671421 A GB 671421A GB 21036/49 A GB21036/49 A GB 21036/49A GB 2103649 A GB2103649 A GB 2103649A GB 671421 A GB671421 A GB 671421A
Authority
GB
United Kingdom
Prior art keywords
per cent
nitrogen
hydrogen
oxygen
volume
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
GB21036/49A
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.)
EDWARD ALFRED WHEELEY
Imperial Chemical Industries Ltd
Original Assignee
EDWARD ALFRED WHEELEY
Imperial Chemical Industries Ltd
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 EDWARD ALFRED WHEELEY, Imperial Chemical Industries Ltd filed Critical EDWARD ALFRED WHEELEY
Priority to GB21036/49A priority Critical patent/GB671421A/en
Publication of GB671421A publication Critical patent/GB671421A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C01B21/02—Preparation of nitrogen
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
    • C01B3/047—Decomposition of ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Catalysts (AREA)

Abstract

A nitrogen atmosphere for metallurgical operations, which may contain a proportion of hydrogen is obtained by passing nitrogen from an air liquifaction or fractionation plant containing up to 5 per cent by volume of oxygen, together with up to 18 per cent by volume of a hydrogen-containing gas obtained from cracking ammonia in the substantial absence of oxygen, over a reduction catalyst at elevated temperature whereby the free oxygen is converted to water vapour which may be removed. Reduction catalysts specified are platinum, a gauze of an iron alloy containing 18 per cent of chromium, 8 per cent nickel and 1 per cent each of tungsten and vanadium, or copper or palladium gauze, employed for example at 600 DEG C. The hydrogen-containing gas is preferably prepared by passage of ammonia at elevated temperature over a catalyst comprising fused iron oxide promoted by alumina and magnesia as in Specification 462,531. Specification 429,940, [Group XII], also is referred to.
GB21036/49A 1949-08-12 1949-08-12 Improvements in and relating to production of nitrogen or nitrogen-hydrogen mixtures Expired GB671421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB21036/49A GB671421A (en) 1949-08-12 1949-08-12 Improvements in and relating to production of nitrogen or nitrogen-hydrogen mixtures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21036/49A GB671421A (en) 1949-08-12 1949-08-12 Improvements in and relating to production of nitrogen or nitrogen-hydrogen mixtures

Publications (1)

Publication Number Publication Date
GB671421A true GB671421A (en) 1952-05-07

Family

ID=10156092

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21036/49A Expired GB671421A (en) 1949-08-12 1949-08-12 Improvements in and relating to production of nitrogen or nitrogen-hydrogen mixtures

Country Status (1)

Country Link
GB (1) GB671421A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406047A1 (en) * 1989-06-30 1991-01-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat-treating of metals
EP0482992A1 (en) * 1990-10-26 1992-04-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for the production of a thermic treatment atmosphere
EP0796919A1 (en) * 1996-03-20 1997-09-24 SOL S.p.A. Process and plant for thermal treatment of metals in protecting atmosphere

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406047A1 (en) * 1989-06-30 1991-01-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat-treating of metals
EP0482992A1 (en) * 1990-10-26 1992-04-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for the production of a thermic treatment atmosphere
FR2668584A1 (en) * 1990-10-26 1992-04-30 Air Liquide PROCESS FOR THE PREPARATION OF A HEAT TREATMENT ATMOSPHERE AND HEAT TREATMENT PLANT.
US5242509A (en) * 1990-10-26 1993-09-07 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process of the production of an atmosphere for the thermal treatment of metals and thermal treatment apparatus
AU643332B2 (en) * 1990-10-26 1993-11-11 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process of the production of an atmosphere for the thermal treatment of metals and thermal treatment apparatus
EP0692545A1 (en) * 1990-10-26 1996-01-17 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Heat-treatment installation
EP0796919A1 (en) * 1996-03-20 1997-09-24 SOL S.p.A. Process and plant for thermal treatment of metals in protecting atmosphere
US6143098A (en) * 1996-03-20 2000-11-07 Sol S.P.A. Process and plant for thermal treatment of metals in protecting atmosphere

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