Nitrogen cleaning loop

The nitrogen cleaning loop consists of a filter to remove any dust, a platinum catalyst bed to remove ethylene glycol, acetaldehyde and oligomers by combustion at quasi-stoichiometric oxygen ratios, and a gas dryer for the removal of moisture down to dew points below —40 °C. The oxygen content of the nitrogen is typically 10 ppm. 

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The nitrogen is constantly cleaned in a gas purification loop. All reaction products and contaminants are burnt in a catalytic combustion system. 

For small and large components the use of the SPX cleaning pits will be necessary to eliminate the residual sodium remained after draining. The process used in the cleaning pits is a mist spraying. This mist is composed by demineralized water, carbon dioxide and nitrogen. For the primary vessel and secondary loops, it is intended to apply a carbonation method. 

Figure 4.26. The amount of ammonia produced in the reaction loop is plotted against time of ammonia synthesis for the 0.15 MLK/Fe(100), clean Fe(lOO), 0.25 MLK/25% Al O j,/Fe(100), and 25% Alj O /Fe(100) surfaces. The nonlinearity of the curves is due to gas-phase ammonia readsorbing on the catalyst and blocking catalytic sites for the dissociation of nitrogen.

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