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7258848 Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide  
The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as...
7128880 Organic recycling with a pipe-cross or tubular reactor  
The invention is directed to a process for enhancing the plant nutrient value of relatively low analysis organic waste material (e.g. sewage sludge) involves treating the waste material with an...
6949236 Aminosulfonate product-treated nitrogen-containing salt particles  
Addition of an aminosulfonate product to an inorganic nitrogen-containing salt provides a composition of matter with improved properties. In particular, 2-acrylamido-2-methylpropanesulfonic acid...
6280494 Method for producing fertilizer grade DAP having an increased nitrogen concentration in a spray column  
A process of forming a mixture of diammonium phosphate and triammonium phosphate by the reaction of phosphoric acid with gaseous ammonia in a spray column. In the process, the reaction occurs under...
6117406 Process for manufacturing ammonium salts  
A process for manufacturing ammonium salts using a reactor which includes a first tubular reaction chamber having at least one acid feed and at least on ammonia feed which are arranged in a first...
5578107 Water soluble caking inhibitors for ammonium phosphates  
There is disclosed a caking inhibitor for mono-and diammonium phosphates which is water soluble and effective at small concentrations rendering the phosphates acceptable in most utilities without...
5244645 Process for removing NH.sub.3 from a liquid stream  
This invention is a process for removing NH 3 from a NH 3 -containing liquid stream. The process contains the following steps: (a) passing a NH 3 -containing first liquid stream, a heated first...
5022913 Stabilized ammonium orthophosphate suspensions  
An improved batch process for the production, in equipment readily available at the fertilizer dealer level, of high-analysis stable ammonium orthophosphate suspension fertilizers effected by the...
4919906 Processes and equipment for production of elemental phosphorus and thermal phosphoric acid  
New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting...
4781905 Process for producing phosphoric acid and/or phosphates from wet-process phosphoric acid and an extractant therein  
A process is developed for producing phosphoric acid and phosphates from wet-process phosphoric acid. The crude acid is extracted with a waterimmiscible solvent mixture consisting of mixed trialkyl...
4744965 Process for producing granular diammonium phosphate  
A process is disclosed for the manufacture of granular diammonium phosphate (DAP) by reacting anhydrous ammonia with phosphoric acid in a reactor to form reaction product consisting of a partially...
4704262 Process for production of dialkali metal phosphates by ion exchange  
A process for the production of dialkali metal phosphates by ion exchange is disclosed. The process is carried out by first ammoniating a water-soluble phosphate source such as phosphoric acid or...
4678650 Process for making an alkali phosphate solution  
An aqueous alkali phosphate solution is made. An organic phase is countercurrently mixed with an aqueous phase, the two phases being used in a volume ratio larger than 1:1 and formed aqueous alkali...
4662929 Method for recovering nutrients from the flue gases of a fertilizer plant  
The invention relates to a method of recovering nutrients from the flue gases of a fertilizer plant by exposing hot, almost water-saturated reaction gases (4) obtained from the fertilizer...
4652295 Fertilizer manufacture  
An improved continuous process for the production of fertilizers, wherein the reactions, mixing, sizing, and moisture removal required to produce a resultant product are carried out on a simple,...
4637921 Process for producing ammonium polyphosphate  
An improved process of concentrating wet process phosphoric acid by continuously contacting an acid feed containing at least about 56 weight percent of P 2 O 5 based on the total weight of the...
4632813 Process for the production of water soluble ammonium phosphates  
A process is disclosed for the production of water soluble ammonium phosphates, comprising the following steps: (a) to react in a reaction step ammonia and untreated phosphoric acid with P 2 O...
4610853 Process for producing purified monoammonium phosphate from wet process phosphoric acid  
A process for producing purified monoammonium phosphate (abbreviated to MAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process...
4610862 Process for producing purified diammonium phosphate from wet process phosphoric acid  
A process for producing purified diammonium phosphate (abbreviated to DAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process...
4592771 Method of producing di-ammonium phosphate fertilizer  
A novel method is provided to produce di-ammonium phosphate fertilizer by operating a DAP reactor and granulator in such a manner that part of the hot exhaust gases from the DAP reactor are...
4565680 Recovery of phosphorus and aluminum from spent acid from the bright-dip aluminum finishing process  
In the process of the invention spent phosphoric acid is concentrated and stripped with air to a greater than 50% P 2 O 5 concentration to remove nitric acid. As a result of concentrating the...
4548798 Laser synthesis of refractory oxide powders  
The present invention relates to a method for the production of refractory oxide powders by pyrolyzing with laser energy a metal- and oxygen-containing organic chemical species characterized by the...
4536378 Phosphate fertilizer production  
Processes for the preparation of phosphoric acid, such as merchant phosphoric acid, and for the provision of phosphoric acid suitable for the preparation of ammonium phosphates, are disclosed. Such...
4505733 Process for producing liquid combined fertilizers  
The process for producing liquid combined fertilizers according to the present invention comprises neutralization of extraction-type phosphoric acid with an excess of gaseous ammonia taken in an...
4500502 Process for removing impurities from wet process of phosphoric acid  
A method of preparing a purified ammoniated phosphoric acid composition, comprising, reacting an aqueous wet process phosphoric acid with an ammonium ion source at a N/P 2 O 5 weight ratio...
4493820 Process for partial removing of impurities from a wet process phosphoric acid  
A process for the partial removal of impurities present in a wet process phosphoric acid used in the production of granulated mono- or di-ammonium phosphate fertilizers in order to control the...
4442081 Process for producing a stabilized phosphoric acid  
A wet process phosphoric acid which has been treated with aluminosilicate after the first stage of clarification can be further stabilized against precipitation of solids during storage and...
4420321 Process for removal of carbon black floc associated with wet-process phosphoric acid in the production of fertilizers  
Black carbonaceous floc in wet-process phosphoric acid is removed by contact with an oxidizing agent during the neutralization step with ammonia. In an embodiment the black floc is removed in...
4390509 Process for manufacturing ammonium phosphate utilizing an oxalic acid acidulating process  
A process for the manufacture of phosphoric acid from phosphate rock is provided. The phosphate rock is digested or acidulated with an acid solution containing oxalic acid to produce phosphoric...
4375980 Production of suspension fertilizers from orthophorphoric acid  
An improved process for the production of concentrated, high-grade, nitrogen-phosphate (N--P 2 O 5 ) base suspension fertilizer from wet-process or other phosphoric acids and ammonia. The process...
4370304 Two-phase spraying device and reaction chamber for the preparation of a product containing ammonium orthophosphate  
Ammonium orthophosphate products are prepared by reacting ammonia and phosphoric acid together at high speed under vigorous mixing conditions by spraying the reactants through a two-phase, dual...
T102601 Production of granular ammonium-polyphosphate with an inline reactor and drum granulator  
Method for production of granular ammonium polyphosphate fertilizer in which ammonium polyphosphate melt is prepared in a simple inline reactor and distributed onto a bed of solids in a drum...
4336053 Fertilizer solutions stabilized with inorganic acids  
A stable liquid fertilizer solution containing nitrogen, phosphorus, iron and optionally sulfur is prepared by mixing a water-soluble iron compound with ammonium polyphosphate and water to produce...
4329326 Process for preparing crystalline ammonium dihydrogen phosphate  
A process for preparing crystalline ammonium dihydrogen phosphate, comprises the steps of (a) adding a sequestering agent into ammonium hydrogen phosphate aqueous solution, the sequestering agent...
4325927 Purified monoammonium phosphate process  
A method of producing purified monoammonium phosphate from wet process phosphoric acid and ammonia is provided. The ammoniation takes place in two stages, the acid being ammoniated in the first...
4313918 Process and device for the preparation of a product containing ammonium orthophosphate, and product obtained by this process  
Ammonium orthophosphate products are prepared by reacting ammonia and phosphoric acid together at high speed under vigorous mixing conditions by spraying the reactants through a two-phase, dual...
4308049 Process for the absorption of ammonia in acid solutions or slurries  
A process is disclosed for the absorption of gaseous or liquid ammonia in acid solutions or slurries, including an ammonia absorption zone separated from a water vapor generation zone disposed at a...
T101203 Process for production of granular diammonium phosphate  
Process for production of diammonium phosphate from orthophosphoric acid and ammonia. A specially designed inline reactor, a pipe reactor, is used to produce a homogeneous slurry with a lower...
4284613 Process for ammoniating phosphoric acid  
A process which comprises reacting ammonia with phosphoric acid in a reaction vessel to form a reaction mixture comprising ammonium phosphate characterized in that the reaction mixture is allowed...
4271134 Treatment of effluent gases from the manufacture of fertilizer  
Process and apparatus are described for an improved treatment of gases effluent from an ammonia phosphoric acid reactor in the manufacture of fertilizers. Ammonia is scrubbed from the gases with...
4236911 Purification and conversion of phosphoric acid to ammonium phosphates  
A method of purifying filter-grade wet-process phosphoric acid, then converting the purified phosphoric acid directly to ammonium phosphate without first concentrating the phosphoric acid. The...
4226833 Apparatus for obtaining biammonium phosphate  
Biammonium phosphate is obtained by the neutralization of phosphoric acid with ammonia in a saturator operating at atmospheric pressure. Unreacted gaseous ammonia is washed in a tower with a "rain"...
4166840 Process for producing ammonium phosphate from ammonia and wet process phosphoric acid  
The present invention relates to a process for reacting ammonia and wet process phosphoric acid to produce ammonium phosphates, which process comprises feeding the reagents to a vessel comprising...
4154593 Process for granulating ammonium phosphate containing fertilizers  
A process for granulating ammonium phosphate containing composition for use as a fertilizer which comprises feeding a slurry or melt of ammonium phosphate, wherein said slurry or melt is capable of...
4152402 Partial purification of wet-process phosphoric acid with acetone and ammonia  
An improved process for the purification of wet-process phosphoric acid (WPPA) with acetone and ammonia. The main product is the purified acid and a byproduct is the impure acid fraction in a...
4147757 Method for producing ammonium phosphate which is substantially free of arsenic  
A process for producing ammonium phosphate that is substantially free of arsenic which comprises: (a) reacting crude phosphoric acid containing dissolved arsenic having a +5 valence state with...
4132540 Process for removing solvent from the raffinate of extracted phosphoric acid and for preparing phosphate salts  
When crude wet process phosphoric acid is solvent extracted, an aqueous raffinate containing phosphoric acid and a small amount of solvent is produced as a by-product. Certain materials are added...
4118462 Process for the preparation of purified phosphoric solutions from phosphoric acid  
Process for the preparation of a purified solution of phosphoric acid, which may be partially neutralized, from wet process phosphoric acid, by liquid-liquid extraction by means of a substantially...
4117089 Process for preparing sodium ammonium hydrogen-phosphate and ammonium chloride from wet process phosphoric acid  
Highly pure sodium ammonium hydrogenphosphate and ammonium chloride are prepared from wet process phosphoric acid. A mixture of phosphoric acid, ammonia and/or sodium chloride is added to a...
4112118 Process for preparing phosphate salts  
Phosphate values can be recovered from an organic extract which is formed by contact of wet process phosphoric acid and a water immiscible solvent, in a process in which the extract is treated with...
Matches 1 - 50 out of 108 1 2 3 >