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Highlighting on Beneficial Use of Nitrous Oxide When Manufactured PowerPoint PPT Presentation


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Highlighting on: * Beneficial Use of Nitrous Oxide When Manufactured, and * Its Adverse Impact When Emitted In Traces With the Industrial Gaseous Effects and Other Human Activities. 180 o C. Highlighting on Beneficial Use of Nitrous Oxide When Manufactured. Introduction

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Highlighting on Beneficial Use of Nitrous Oxide When Manufactured

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Highlighting on beneficial use of nitrous oxide when manufactured

Highlighting on:* Beneficial Use of Nitrous Oxide When Manufactured, and* Its Adverse Impact When Emitted In Traces With the Industrial Gaseous Effects and Other Human Activities


Highlighting on beneficial use of nitrous oxide when manufactured

180 oC

Highlighting on Beneficial Use of Nitrous Oxide When Manufactured

  • Introduction

  • Properties (colourless, critical temperature, critical pressure, boiling point…)

  • Uses of Nitrous oxide (medicine, semi conductor industry, …)

  • Nitrous oxide manufacture and market volume

    NH4NO3 N2O + H2O


Adverse impact of involuntarily emitted nitrous oxide

Adverse Impact of Involuntarily Emitted Nitrous Oxide

There are 2 major sources of N2O emissions:

  • Improper application of N-fertilizers in agriculture

  • Oxidation of ammonia for nitric acid manufacture


3 development of the nitric acid technology

3. Development of the Nitric Acid Technology

  • Basic chemistry of nitric acid process has not changed in the last hundred years.

  • N.B.

    4NH3 + 5O2 4NO + 6H2O

    2NO + O2  2NO2

    3NO2 + H2O  2HNO3 + NO

    4NH3 + 4O2  2N2O + 6H2O

    4NH3 + 3O2 2N2 + 6H2O

    4NH3 + 6NO  5N2 + 6H2O


Highlighting on beneficial use of nitrous oxide when manufactured

No-yield , per cent

Fig. 1 Change I nitric oxide yield as a function of oxygen-to-ammonia ratio


Development in nitric acid technology

Development in Nitric Acid Technology

  • Among various development in nitric acid technology the following milestones are cited:

    • Development of material of construction:

      • Construct larger ammonia converters

      • Construct of big absorption towers for N2O

    • Development of Catalyst:


Highlighting on beneficial use of nitrous oxide when manufactured

Oxide formation is reduced as shown in this table


Development of abatement systems for nox in general and n 2 o in particular

Development of abatement systems for NOx in general and N2O in particular

  • The boom in the measuring instrument made it possible to measure continuously NH3 / NOx in the tail gas (or exhaust goal thus reducing excess ammonia to about)

  • The development in the catalysis (SCR selective catalytic reduction) made it possible to improve the performance of abatement reaction considerably. To less than 50 pm in tail gas


Development of abatement systems for nox in general and n 2 o in particular1

Development of abatement systems for NOx in general and N2O in particular

  • The latest development includes a catalyst and process of reducing N2O emissions at the top of the same reactor of NOx emissions

    The tail gas upstream of tail gas turbine is fed to the reactor first catalyst bed for catalytic thermal decomposition of N2O

    N2O  N2 + ½ O2-82 KJ

    Then the tail gas is mixed with ammonia before entering the second catalyst bed where NOx is catalytically reduced to N2 & water vapor

    4NO + 4HH3 + O2 4N2 + 6H2O-1628 KJ

    3NO2 + 4NH3 7/2 N2 + 6 H2O -1367 KJ


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