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US 4,557,920 AGranted
Process for making fuming nitric acid
AssigneeVersar, Inc.
InventorsEdwin F. Rissmann, Kendall B. Randolph
Life of this patent
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Abstract
A process for making fuming nitric acid involving the reacting of nitrogen dioxide gas with dry hydrogen chloride gas to produce the fuming nitric acid directly, and to produce as a co-product nitrosyl chloride gas; separating the formed liquid fuming nitric acid from the reaction gases and co-product gas; and stripping the liquid product and demisting the gaseous product to complete their separation.
Claims4
A gas-phase reaction process for making fuming nitric acid exclusively from dry gaseous NO.sub.2 and dry gaseous HCl consisting of the steps of:
- (a) reacting said dry nitrogen dioxide gas with said dry hydrogen chloride gas to directly produce liquid droplets of fuming nitric acid and nitrosyl chloride gas;
- (b) collecting the droplets of fuming nitric acid as a liquid and stripping the liquid to remove nitrosyl chloride and other trace gases dissolved therein;
- (c) collecting the nitrosyl chloride gas and any stripped trace gases and demisting them to recover entrained fuming nitric acid therefrom;
- and
- (d) recovering the liquid fuming nitric acid produced by said process.
2 more elements
Dependencies are inferred from the claim text.