Nitrogen dioxide manufacturing methods

With the aid of the carrier gas flow the trace zone was transferred into the analytical column. Under such conditions carbon dioxide is completely retained by diethanolamine. The concentration and analysis were performed at room temperature. The separated trace components were sensed by a flame-ionization detector. The carrier gas (nitrogen) flow-rate was 60 ml/min. For regeneration the concentration column was heated in the carrier gas flow at 100—105°C for 5—7 min. For heating and cooling a special device forming part of a KhT-2M chromatograph manufactured in the U.S.S.R. was used. The duration of the total analytical cycle was 25 min. This method permits the determination of hydrocarbon gases in carbon dioxide at concentrations down to 10" %. 

The traditional method of manufacturing liquid sulfur dioxide involved a sulfur burner, SOa/nitrogen separation, SO2 compression, and condensation. The process is highly capital intensive and generates a significant amount of by-product that requires disposal. 

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