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Absorption of NO2/N2O4into diluted and concentrated nitric acid

Authors
Journal
The Chemical Engineering Journal
0300-9467
Publisher
Elsevier
Publication Date
Volume
23
Issue
2
Identifiers
DOI: 10.1016/0300-9467(82)80013-0

Abstract

Abstract The absorption rate and mechanism of NO 2-N 2O 4 gas mixtures diluted with nitrogen into nitric acid solutions were investigated in a wetted wall column at 20 °C and 30 °C. It was found that N 2O 4, which is continuously in equilibrium with NO 2, is preferentially absorbed into diluted nitric acid as well as into concentrated nitric acid. The absorption of N 2O 4 into diluted acid is accompanied by a rapid pseudo-first order reaction with water. Values of H N 2O 4 were measured as a function of the acid strength at 20 °C. Above 63% nitric acid the absorption was found to be purely physical. The solubility of N 2O 4 into concentrated nitric acid (63%) was derived from total vapour pressure data concerning the system NO 2-N 2O 4-H 2O-HNO 3. It was found that Henry's law was valid within the condition considered.

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