초록 ▼

The exothermicity attending decomposition of N2O to nitrogen and oxygen can lead to a multiplicity of process difficulties associated with high process temperatures. An improved process is one where a portion of the exit gases, depleted in N2O, is first cooled and then recycle to the N2O-decompositi

The exothermicity attending decomposition of N2O to nitrogen and oxygen can lead to a multiplicity of process difficulties associated with high process temperatures. An improved process is one where a portion of the exit gases, depleted in N2O, is first cooled and then recycle to the N2O-decomposition zone. The process is amenable to process control to afford a very stable process largely independent on the particular catalyst used for N2O decomposition. Where the N2O-containing waste gas stream also contains NOx, if it often highly desirable to pretreat the stream to remove NOx prior to the N2O-decomposition zone.

대표청구항 ▼

A process for the decomposition of N2O in a gas stream comprising: 1) passing an N2O-containing gas stream into a N2O-decomposition zone, having a permissible maximum temperature, Tmax, corresponding to the lower of the onset of catalyst sintering or NOx formation, where said N2O-containing gas stre

A process for the decomposition of N2O in a gas stream comprising: 1) passing an N2O-containing gas stream into a N2O-decomposition zone, having a permissible maximum temperature, Tmax, corresponding to the lower of the onset of catalyst sintering or NOx formation, where said N2O-containing gas stream is brought into contact under N2O-decomposition conditions with a catalyst effecting decomposition of N2O into nitrogen and oxygen to afford an effluent gas stream depleted in N2O and enriched in nitrogen and oxygen; 2) cooling at least a portion of the effluent gas stream to afford a cooled effluent gas stream; and 3) recycling at least a portion of the cooled effluent gas stream to the N2O-decomposition zone so as to maintain all temperatures in the N2O-decomposition zone below Tmax.