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| Number | Title | Issue Date |
| 7270796 | Ammonium/ammonia removal from a stream In one embodiment, an ammonium removal method can comprise: removing a multivalent cation from a stream comprising ammonium to form a treated stream; converting the ammonium in the stream to ammonia by increasing the pH of the stream; and separating the ammonia from... | 09/18/2007 |
| 7229601 | Ammonia reclamation system A process for reclaiming ammonia from waste streams comprises reacting at least one waste stream with an excess of hydroxide to produce ammonia and water. The ammonia is removed from the reaction vessel and purified. ... | 06/12/2007 |
| 6333012 | Process for producing ammonium metavanadate A process is provided for preparing ammonium metavanadate from the combustion ashes resulting from the combustion of petroleum fuels in a boiler by using the ammonium sulfate and vanadium components in the combustion ash. Water is added to the combustion ... | 12/25/2001 |
| 6315976 | Method of producing potassium sulfate A process is provided for producing potassium sulfate by reacting ammonium sulfate and potassium chloride at a temperature of about 30 to 40° C. to produce a slurry containing K2 SO4.multidot.NH.sub.4.multidot.2SO.sub.4 double salt,... | 11/13/2001 |
| 6077494 | Method for removing ammonia from ammonia contaminated fly ash A method for removing ammonia from coal fly ash contaminated by ammonium salts is disclosed. The method involves the addition of small amounts of water, and in some cases, small amounts of an alkali source, to the fly ash to liberate the ammonia trapped t... | 06/20/2000 |
| 6033637 | Method for treating combustion ashes A method is provided for treating ashes from the combustion of petroleum fuels by mixing the combustion ashes with water to produce a slurry; injecting either calcium oxide or calcium hydroxide into the slurry and reacting the calcium oxide or calcium hyd... | 03/07/2000 |
| 5449506 | Process for producing potassium carbonate A method for producing potassium carbonate using a continuous countercurrent exchange system. A continuous ion exchange system with resin in the ammonium form is flushed with a saturated potassium chloride solution which displaces the ammonium ion and rep... | 09/12/1995 |
| 5407655 | Process for the removal and the recovery of ammonia from liquid waste A process for the removal and recovery of ammonia from liquid waste, characterized essentially by the following operations: reacting the liquid waste with pure carbon dioxide, or with a gaseous mixture rich in carbon dioxide, or with at least one carbonate, to... | 04/18/1995 |
| 5387407 | Process for the recovery of ammonia from flue gases For reducing nitrogen oxides in the flue gases of a firing plant, fresh ammonia water, i.e. an aqueous solution of ammonia (NH3), is introduced into the flue gas flow. For achieving a high degree of separation of the nitrogen oxide a superstoic... | 02/07/1995 |
| 4915705 | Production of silica and fluorine-containing coproducts from fluosilicic acid A process for producing high grade silica and fluorine-containing coproducts from fluosilicic acid is described. To produce silica, the fluosilicic acid is reacted with aqueous ammonia to produce a solid silica product and a solution of ammonium fluoride.... | 04/10/1990 |
| 4594131 | Process for removing ammonia and acid gases from process streams A water purification process is described for the removal of ammonia and optionally one or more acid gases from wastewaters such as coke-plant or coal conversion wastewaters. The process involves adding alkali to these wastewaters in amounts sufficient to... | 06/10/1986 |
| 4530821 | Bridging operational shut-downs of the ammonia washer of a plant operating according to the semi-direct technique for the removal of ammonia from coking oven gas A process and system are disclosed for the bridging of operational standstills of an ammonia washer of a plant operating according to the semi-direct technique for the removal of ammonia from coking oven gas. During the operational standstills of the ammo... | 07/23/1985 |
| 4328189 | Apparatus for the granulation of precipitation products formed from ammonium compounds An apparatus for granulation of precipitation products, comprising a liquid-filled reaction chamber including a granulation chamber which receives aqueous streams of compounds which precipitate to form granules. The granulation chamber has an open upper e... | 05/04/1982 |
| 4323430 | Process for separating ammonia and acid gases from streams containing fixed ammonia salts A process for the substantially complete removal of acid gases and ammonia from aqueous solutions is disclosed, which comprises a two stage distillation operation wherein the pressure in the first distillation stage is substantially less than the pressure... | 04/06/1982 |
| 4294812 | Recovery of ammonia from aqueous streams Fixed ammonia in an aqueous stream is converted to free ammonia in solution by mixing the stream with a lime slurry in a mixing zone. The resulting liquid mixture is heated by contact with steam-containing gas to a temperature of at least about 95° C. to... | 10/13/1981 |
| 4263145 | Recovery of ammonia or amine from a cation exchange resin Ammonia or an amine such as morpholine is recovered from a resin bed comprising an alkali metal, e.g., sodium, and ammonium or amine salts of a strong acid cation exchange resin by contacting the cation resin with an aqueous solution of an alkaline earth ... | 04/21/1981 |
| 4260462 | Process for separating acid gases and ammonia from dilute aqueous solutions thereof A process is described for the removal of acid gases and ammonia from dilute aqueous solutions. This is achieved by two separate and successive distillations. In the first distillation, substantially all of the acid gases and free ammonia are removed. In ... | 04/07/1981 |
| 4187280 | Process for recovering useable products from by-product ammonium nitrate formed in the manufacture of nuclear reactor fuels or breeder materials Radiation-contaminated ammonium nitrate is heated in solution to about 100° C. in the presence of finely powdered calcium oxide or lithium hydroxide. Ammonia and water vapor are given off leaving an alkaline or alkaline earth nitrate which can then be sa... | 02/05/1980 |
| 4165264 | Ammonia leaching An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and coppe... | 08/21/1979 |
| 4111759 | Process for separating ammonia and acid gases from waste waters containing fixed ammonia salts A water purification process is described for the removal of ammonia and optionally one or more acid gases from waste waters such as coke-plant or coal conversion waste waters. The process involves adding lime to these waste waters in amounts sufficient t... | 09/05/1978 |
| 4108734 | Process for the distillation of weak ammonia liquor The fouling of ammonia stills which results from the clogging, particularly of the lower plates of the stills, with sludge and precipitates is eliminated by use of a calcium compound precipitation step followed by a clarification step prior to initiation ... | 08/22/1978 |
| 4108735 | Method for improved distillation of ammonia from weak ammonia liquor Fouling of an ammonia still, used for removal of ammonia from weak ammonia liquor derived from a coal coking operation, is alleviated by pre-precipitating insoluble calcium salts from the ammonia liquor by treatment of the liquor with lime prior to introd... | 08/22/1978 |
| 4105754 | Production of high purity calcium thiosulfate A process for the production of high purity calcium thiosulfate by a metathesis reaction of ammonium thiosulfate and calcium hydroxide or calcium oxide is disclosed. Aqueous solutions of high purity calcium thiosulfate, in concentrations up to about 30% b... | 08/08/1978 |
| 4104131 | Process for separating ammonia and acid gases from waste waters containing fixed ammonia salts A water purification process is described for the removal of ammonia and optionally one or more acid gases from waste waters such as coke-plant or coal conversion waste waters. The process involves adding lime to these waste waters in amounts sufficient t... | 08/01/1978 |
| 4076515 | Method for treatment of digester supernatant and other streams in wastewater treatment facilities Digester supernatants and/or liquors from sludge dewatering are reacted with an excess of an alkaline reagent having a stronger cation than the ammonium ion and the reaction product is separated into a solution containing aqueous ammonia and solids. The a... | 02/28/1978 |
| 4061718 | Method for the recovery of ammonia from liquor from the filters of ammonia-soda plants A method for the recovery of ammonia from liquor from the filters of ammonia-soda plants, which contains free ammonia and ammonium chloride. In this method the liquor is heated to release the free ammonia, and the remaining liquor is then treated successi... | 12/06/1977 |
| 3991047 | Process for preparing lactams In a process for the preparation of lactam from cycloalkanone comprising reacting said alkanone with hydroxylamine sulfate to form the corresponding cycloalkanone oxime followed by Beckman rearrangement to yield said lactam and neutralization of the sulfu... | 11/09/1976 |
