Nitric acid production and recycle
AssigneeDrinkard Metalox, Inc.
InventorWilliam F. Drinkard, Jr.
Life of this patent
Estimating the term…
Abstract
An improved process for either the manufacturing of nitric acid, recycling of nitric acid, or recovering of nitric acid, comprising the steps of: providing a source of NOx; reacting NO from the source of NOx with HNO3 in the presence of NO2− to produce a resulting product; and reacting the resulting product with O2 and H2O to produce nitric acid.
Claims48
A process for producing nitric acid comprising the steps of:
- reacting nitric oxide (NO) with nitric acid (HNO3) in aqueous solution to form nitric trioxide (N2O3) in aqueous solution;
- and
- oxidizing the nitric trioxide N2O3) with oxygen in aqueous solution to form nitric acid (HNO3) while maintaining the concentration of said nitric trioxide (N2O3) between 0.1 to 40.0 g/l.
A method of producing nitric acid which comprises the steps of:
- providing a source of NOx;
- reacting NO from said source of NOx with HNO3 in the presence of NO2− catalyst to produce N2O3;
- and
- reacting said N2O3 with O2 and H2O to produce nitric acid while maintaining the concentration of said N2O3 between 0.1 and 40.0 g/l.
A process of producing nitric acid which comprises the steps of:
- providing a source of HNO3(1);
- reacting a portion of said HNO3(1) with an oxidizable substance to generate NOx;
- reacting NO from said NOx with HNO3(1) to produce nitric trioxide (N2O3) in aqueous solution;
- and
- reacting said nitric trioxide (N2O3) with O2 and H2O to form additional HNO3(1) while maintaining the concentration of said nitric trioxide (N2O3) between 0.1 to 40.0 g/l.
A method of manufacturing nitric acid which comprises providing a source of NOx, reacting NO from said source of NOx with HNO3 (aq) in the presence of NO2− to produce nitric trioxide (N2O3) in aqueous solution and reacting said nitric trioxide with O2 and H2O while maintaining the concentration of said nitric trioxide N2O3 between 0.1 to 40.0 g/l.
A process for generating nitric acid (HNO3) comprising the steps of:
- reacting a +2 valence gaseous nitrogen with a +5 valence nitrogen in solution to obtain a +3 valence nitrogen in solution;
- maintaining the +3 valence nitrogen in solution at a concentration from 0.1 to 40.0 g/l;
- and,
- reacting the +3 valence nitrogen, in said solution, with oxygen and water to produce nitric acid while maintaining a level of +3 valence nitrogen in excess of added oxygen.
A method of increasing nitric acid concentration which comprises the steps of:
- providing a source of NOx;
- reacting NO from said source of NOx with HNO3 (aq) to produce N2O3 (aq);
- and
- reacting said N2O3 (aq) with O2 and H2O to produce nitric acid having a higher concentration while maintaining the concentration of said nitric trioxide N2O3 between 0.1 to 40.0 g/l.
A process for producing nitric acid comprising the step of reacting nitric oxide (NO) with nitric acid (HNO3) in aqueous solution to form nitric trioxide (N2O3) that is simultaneously oxidized with oxygen in aqueous solution to form nitric acid (HNO3) while maintaining the concentration of said nitric trioxide N2O3 between 0.1 to 40.0 g/l.
Dependencies are inferred from the claim text.