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| Number | Title | Issue Date |
| 7118723 | Method for producing nitric acid A process for producing nitric acid of a concentration in the range of 68 to 76% by weight, using the mono-pressure or the dual-pressure process in which the ammonia feedstock is combusted with the aid of compressed process air. The water vapour content of the proce... | 10/10/2006 |
| 6737034 | Nitric acid production A method process to convert inhibited red fuming nitric acid (IRFNA) and/or nitrogen tetraoxide to either dilute or concentrated (98%+) nitric acid. The method describes a process to remove all of the normal inhibitors (if required), that have been reported to been ... | 05/18/2004 |
| 6641638 | Process for nitrogen oxide waste conversion to fertilizer The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at le... | 11/04/2003 |
| 6231824 | Removal of nitric oxide from gas streams Nitric oxide is removed from a gas stream by contacting the gas stream with oxygen in the presence of a metal-cation exchanged zeolite, thereby oxidizing the nitric oxide to nitrogen dioxide, then contacting the resulting nitrogen dioxide-containing gas s... | 05/15/2001 |
| 6039783 | Process and equipment for nitrogen oxide waste conversion to fertilizer The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at least ... | 03/21/2000 |
| 5366711 | Process for the oxidative purification of waste gases containing nitrogen oxides A process is described for the removal of nitrogen oxides from waste gases with the recovery of nitric acid or a nitrate solution. The waste gas is reacted with hydrogen peroxide in an amount appropriate to the desired degree of removal of nitrogen oxides... | 11/22/1994 |
| 5275639 | Recovery of phosphates from elemental phosphorus bearing wastes A process for oxidizing aqueous elemental phosphorus containing residues (sludges) to produce orthophosphate containing slurries suitable for subsequent reaction with ammonia to produce nitrogen- and phosphorus-containing fertilizer products. It comprises... | 01/04/1994 |
| 5017348 | Treatment of nitrogen oxides The mixture of aqueous nitric and nitrous acids which is produced by the absorption of nitrogen oxides with water in the manufacture of nitric acid is conducted to a closed vessel, where the acid mixture is reacted with oxygen, preferably under pressure, ... | 05/21/1991 |
| 4925643 | Regeneration of nitrous acid by oxidation with direct application of heated nitric acid A method for regenerating an aqueous liquid comprising nitrous acid and/or oxides of nitrogen is characterized by feeding the liquid to a column such that the liquid descends through the column. An aqueous solution comprising nitric acid is heated to its ... | 05/15/1990 |
| 4603036 | Process for treatment of a gas stream containing nitrogen oxides An oxido-reduction process for nitrogen oxides contained in a gas stream also containing oxygen, in a countercurrent gas-liquid contact device. In this process, (a) for values of the ratio NO/NO2 greater than 1, in that section of the gas-liqui... | 07/29/1986 |
| 4562052 | Process for the removal of nitrogen oxides from nitric acid plant tail gas The present invention involves a process for removing nitrogen oxides from an off gas stream, such as nitric acid plant tail gas. The off gas is scrubbed with concentrated nitric acid to remove nitrogen oxides to a concentration below about 200 ppm. The n... | 12/31/1985 |
| 4419333 | Process for removal of nitrogen oxides To remove nitrous gases from gas mixtures there is needed a process and apparatus by which they can be eliminated quickly, without formation of secondary waste and as cheaply as possible. This is done by scrubbing the nitrous gases out of the gaseous mixt... | 12/06/1983 |
| 4325923 | Contacting of plural phases Intimate and efficient contacting of plural, physically disparate phases, e.g., a gas and a liquid, is achieved by contacting the phases cocurrently in a column. The gas phase is introduced at a velocity between its phase transition inversion point (T) an... | 04/20/1982 |
| 4251505 | Process for carrying out gas/liquid reactions Gas/liquid reactions are carried out in a downstream reactor in which the gas having a bubble diameter of 0.1 to 4 mm is injected into the liquid flowing downward at an empty tube velocity of 0.14 m/s to 0.5 m/s. The proportion by volume of liquid to gas ... | 02/17/1981 |
| 4206185 | Process to retain tritium Tritium formed in the treatment of spent nuclear fuel and during storage of liquid, radioactive waste products is retained by adding oxygen to said liquid, radioactive waste products, reducing in a subsequent stage the oxygen enriched with tritium and sep... | 06/03/1980 |
| 4064221 | Process for obtaining nitric acid of a concentration higher than the azeotropic concentration by means of the absorption of nitrogen oxides in water or diluted nitric acid The present invention relates to a process for obtaining nitric acid of a concentration higher than the azeotropic concentration by means of the absorption of nitrogen oxides in water or diluted nitric acid and the partial pressure of the nitrogen oxides ... | 12/20/1977 |
| 4036934 | Preparation of nitric acid DISCLOSED IS A TWO STAGE process AND APPARATUS for preparation of NITRIC AICD characterized by efficient use of heat liberated by the conversion of NITROGEN OXIDES TO NITRIC ACID.... | 07/19/1977 |
| 4031187 | Process for the production of nitric acid Nitric acid having a concentration of at least 98% by weight is obtained from a gaseous stream resulting from catalytic oxidation of ammonia and containing nitrogen oxide and steam, by flowing said stream in an oxidation and condensation column in counter... | 06/21/1977 |
| 4018873 | Processes for the preparation of concentrated nitric acid Nitric acid having a concentration of at least 98 wt.% is prepared by recovering in liquid state nitrogen peroxide from a gaseous flow containing the same, by absorption in nitric acid, heating of the resulting solution and liquefaction of the gaseous per... | 04/19/1977 |
| 4018872 | Process for the production of concentrated nitric acid Nitric acid having a concentration of at least 98 wt.% is produced from nitrogen peroxide by absorbing the latter in superazeotropic nitric acid, distilling the resulting solution so as to recover nitric acid at a concentration of at least 98 wt.% and nit... | 04/19/1977 |
| 3991167 | Process for lowering nitrogen oxides in effluent gases A process for reducing the level of nitrogen oxide contaminants in an industrial effluent gas comprises (a) oxidizing said gas to convert the contaminants substantially to a mixture of N2 O3 and NO2 and (b) passing the oxi... | 11/09/1976 |
