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| Number | Title | Issue Date |
| 7189574 | Measurement of nitrogen content in a gas mixture by transforming the nitrogen into a substance detectable with nondispersive infrared detection A method of determining the amount of nitrogen in a gas mixture. The constituent gases of the mixture are dissociated and transformed to create a substance that may measured using nondispersive infrared adsorption techniques. ... | 03/13/2007 |
| 7070750 | Multiple-pressure process for the production of ammonia The invention relates to a process for the production of ammonia from synthesis gas, the synthesis of ammonia from synthesis gas taking place in several lined-up synthesis systems, whereby ammonia is produced from a portion of the synthesis gas in each system with a... | 07/04/2006 |
| 7025944 | Process for the preparation of ammonia Process for the preparation of ammonia comprising contacting ammonia synthesis gas with one or more catalysts, at least one catalyst having supported ruthenium as the active catalytic material supported on a nitride on a secondary support. A catalyst for use in the ... | 04/11/2006 |
| 6780387 | Process for the preparation of ammonia Process for the preparation of ammonia by contacting an ammonia synthesis gas with ammonia catalyst particles arranged in a fixed bed, wherein the fixed bed comprises catalyst particles of the ammonia catalyst with a particle size being in the range of | 08/24/2004 |
| 6764668 | Process for the preparation of ammonia and ammonia synthesis gas Process for the preparation of ammonia from ammonia synthesis gas by contacting the synthesis gas with ammonia forming conditions with a catalyst comprising ruthenium as the active catalytic material supported on a carrier of boron nitride and/or silicon nitride. | 07/20/2004 |
| 6479027 | Process for the preparation of ammonia and ammonia synthesis gas Process for the preparation of ammonia from ammonia synthesis gas by contacting the synthesis gas with ammonia forming conditions with a catalyst comprising ruthenium as the active catalytic material supported on a carrier of boron nitride and/or silicon ... | 11/12/2002 |
| 5846507 | Fe1-x O-based catalyst for ammonia synthesis This invention relates to a catalyst for ammonia synthesis. The main phase of the catalyst is a non-stoichiometric ferrous oxide expressed as Fe1-x O, which is structurally in a Wustite crystal phase form having the rock salt face-centered cubi... | 12/08/1998 |
| 5736116 | Ammonia production with enriched air reforming and nitrogen injection into the synthesis loop A retrofit method for increasing production capacity of an ammonia plant having a front end including in series primary and secondary reformers and a shift converter for reacting a hydrocarbon feed, steam and air to form a make-up syngas stream comprising... | 04/07/1998 |
| 4988491 | Flexible integration of the production of ammonia and urea The process of the present invention which produces the flexible integration for the production of ammonia and urea uses adiabatic reforming of the carbonaceous feedstock such as natural gas. With adiabatic reforming of natural gas, a surplus of carbon di... | 01/29/1991 |
| 4902845 | Method to extend life of iron oxide-containing catalysts using low levels of oxygen Catalyst activity life of an iron oxide-containing catalyst is extended by contacting such catalyst with a feedstream containing about 0.0001 to about 0.01 mole of oxygen per mole of feed in the substantial absence of an oxidation catalyst.... | 02/20/1990 |
| 4822586 | Ammonia synthesis method A process for producing ammonia by reaction of a hydrogen and nitrogen-containing synthesis gas in the presence of a solid particulate catalyst for the reaction, includes conducting the reaction at pressures significantly lower than that of conventional a... | 04/18/1989 |
| 4820503 | Catalytic hollow spheres The improved, heterogeneous catalysts are in the form of gas-impervious, hollow, thin-walled spheres (10) suitably formed of a shell (12) of metal such as aluminum having a cavity (14) containing a gas at a pressure greater than atmospheric pressure. The ... | 04/11/1989 |
| 4789538 | Method of preparing ammonia and ammonia synthesis catalysts A process for producing ammonia comprising selecting a catalyst precursor characterized by the formula: wherein A is an alkali or alkaline earth metal or mixture thereof; M is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Lu and Y or mixtures; M'... | 12/06/1988 |
| 4735789 | Process for the production of catalytically-active metallic glasses Catalytically-active metallic glasses containing at least one element from a subgroup of the periodic system and at least one element from a main group of the periodic system. Process for the production of catalytically-active metallic glasses where the m... | 04/05/1988 |
| 4702903 | Method and apparatus for gas separation and synthesis Pressure swing adsorption gas separations are conducted inside an open loop Stirling cycle apparatus which may operate as an engine, refrigerator or heat pump. Adsorbent surfaces are associated with the thermal regenerators of the Stirling cycle apparatus... | 10/27/1987 |
| 4703030 | Partially reduced ferric oxide catalyst for the making of ammonia via the photoassisted reduction of molecular nitrogen and method for the preparation of the catalyst A novel, activated catalyst is provided for the synthesis of ammonia via the photoassisted reduction of molecular nitrogen by water. The novel catalyst is an incompletely reoxidized hydrogen reduced ferric oxide which is prepared by the reduction of an ir... | 10/27/1987 |
| 4689208 | Ammonia synthesis In an ammonia synthesis process a nitrogen-hydrogen gas is reacted partially over a catalyst at a pressure in the range 30-120 bar abs, ammonia is separated as liquid after cooling the reacted synthesis gas and unreacted synthesis gas is recycled. The liq... | 08/25/1987 |
| 4668657 | Iron catalyst and method of producing it An iron oxide containing precursor to a catalyst, for e.g. ammonia synthesis having a surface area above 10 m2.g.sup.-1 also containing alumina and cobalt oxide. The latter serves to increase the catalytic activity and/or reduce the rate of dec... | 05/26/1987 |
| 4668658 | Iron catalyst and method of producing it A pelleted iron oxide catalyst precursor wherein the iron oxide has an O/Fe atomic ratio in the range 1.2 to 1.4, a high surface area and a density of at least 2.6 g.cm-3. The precursor may be made by de-oxidizing, by heating in the presence of... | 05/26/1987 |
| 4623532 | Catalysts for synthesis of ammonia Bi-metallic alloys of iron and titanium are employed as catalysts for reacting nitrogen and hydrogen to yield ammonia. The binary alloy composition is first activated by removing surface oxides with hydrogen gas at elevated temperatures and pressures. The... | 11/18/1986 |
| 4592903 | Low severity hydrocarbon steam reforming process In a process for producing ammonia which comprises: (a) primary catalytically reforming at super atmospheric pressure in a direct-fired primary reforming zone, a hydrocarbon feedstock with steam to produce a gas containing carbon oxides, hydrogen and meth... | 06/03/1986 |
| 4568530 | Ammonia synthesis A process for production of ammonia wherein stoichiometrically hydrogen-lean synthesis gas is reacted over a highly active synthesis catalyst.... | 02/04/1986 |
| 4564702 | Hydrogenation reactions Catalytic reactions for the hydrogenation of alkenyl, alkynyl, aryl, cyano, imino, carbonyl and carboxyl groups and for the synthesis of ammonia are disclosed.... | 01/14/1986 |
| 4547273 | Mobile atom insertion reaction, mobile atom transmissive membrane for carrying out the reaction, and reactor incorporating the mobile atom transmissive membrane Disclosed is a method of carrying out a mobile atom insertion reaction, such as a hydrogen insertion reaction, for the synthesis of reduced, hydrogenated compounds. Such reactions include the production of ammonia and hydrazine from nitrogen, formic acid ... | 10/15/1985 |
| 4521394 | Conversion of gases to useable products Processes for the conversion of gases into useable products as exemplified by the reaction of carbon monoxide and hydrogen to form paraffinic hydrocarbons, hydrogen and nitrogen to form ammonia, and water and carbon monoxide to form carbon dioxide and hyd... | 06/04/1985 |
| 4483756 | Method of applying electrical energy to a reactant chamber A method for applying electrical energy within a reactant chamber to enhance a process being carried out in said chamber. The chamber is filled solely or in part with an electrical energy-producing material which will produce electrical energy when excite... | 11/20/1984 |
| 4379078 | Process for producing granulated catalyst for the synthesis of ammonia A process for producing a granulated catalyst for the synthesis of ammonia which comprises simultaneous melting and oxidation of iron using promotors in a thin layer of a melt of the resulting catalyst mass, granulation of said melt by a stream of air ens... | 04/05/1983 |
| 4348370 | Ammonia synthesis with catalyst derived by heating on a support a salt selected from alkali metal, alkaline earth metal, iron and cobalt hexacyanocobaltates and hexacyanoruthenates Synthesis of ammonia employing at least one salt selected from alkali metal-, an alkaline earth metal-, iron- and cobalt hexacyanocobaltate and hexacyanoruthenate on a suitable support and then heating the composition to provide it with suitable activity.... | 09/07/1982 |
| 4337232 | Ammonia synthesis process using molybdenum oxycarbonitride catalyst A process for synthesizing ammonia is described wherein a mixture of nitrogen and hydrogen is contacted with novel molybdenum oxycarbonitride catalyst.... | 06/29/1982 |
| 4320100 | Purification of gas mixtures The invention concerns a process for the purification of a hydrogen-containing gas mixture comprising up to 45% by volume of hydrogen, together with carbon oxides, hydrogen cyanide and impurities including nitrogen oxides and/or oxygen. The process compri... | 03/16/1982 |
| 4309311 | Ammonia synthesis with catalyst derived by heating on a support a salt selected from alkali metal, alkaline earth metal, iron and cobalt hexacyanocobaltates and hexacyanoruthenates Synthesis of ammonia employing at least one salt selected from alkali metal-, an alkaline earth metal-, iron- and cobalt hexacyanocobaltate and hexacyanoruthenate on a suitable support and then heating the composition to provide it with suitable activity.... | 01/05/1982 |
| 4298588 | Ammonia production process An ammonia production process comprises steam hydrocarbon primary reforming, air secondary reforming, carbon monoxide hift, carbon oxides removal, ammonia synthesis and discarding of non-reactive gases and is made more economical in energy consumption by ... | 11/03/1981 |
| 4271136 | Process for the production of ammonia A process for the production of ammonia comprises passing hydrogen and nitrogen over a catalyst comprising a transition metal, e.g. ruthenium, and a modifying metal, e.g. an alkali metal, supported on a graphite-containing carbon support having specified ... | 06/02/1981 |
| 4271041 | High surface area molybdenum oxycarbide catalysts Novel, high specific surface area molybdenum oxycarbide catalysts are disclosed. They are prepared by the vapor condensation of molybdenum hexacarbonyl and catalyze the reaction of hydrogen and carbon monoxide to form hydrocarbons. Carburization of the mo... | 06/02/1981 |
| 4238468 | Ammonia manufacturing process In an ammonia manufacturing operation a normally gaseous hydrocarbon or a vaporized naphtha is steam reformed and shift converted, in the presence of air to produce a relatively hot water vapor-containing gaseous stream containing nitrogen and hydrogen in... | 12/09/1980 |
| 4163775 | Process for the synthesis of ammonia using catalysts supported on graphite containing carbon Catalyst for the synthesis of ammonia from hydrogen comprises (1) as support on graphite containing carbon having (a) a basal plane surface area of at least 100 m 2/G (b) a ratio of BET surface area to basal plane surface area of not more than 5:1 and (c)... | 08/07/1979 |
| 4153673 | Low energy ammonia synthesis process An improved synthesis loop for the production of ammonia has a low pressure, i.e. less than 100 atmospheres, a water absorption recovery system which utilizes low level heat recovered from the process for producing the synthesis gas to distill the ammonia... | 05/08/1979 |
| 4128621 | Production of ammonia Ammonia may be produced by the catalytic reaction of nitrogen and hydrogen, said reaction being effected in the presence of an activated transition metal macrocyclic compound. The catalyst is exemplified by cobalt phthalocyaninetetrasulfonate which has be... | 12/05/1978 |
| 4107277 | Process for production of ammonia An improved process for the production of ammonia by the synthesis of hydrogen and nitrogen employs a high pressure electrolyzer to produce hydrogen at the high pressures required by the ammonia synthesis process without use of mechanical compressors, uti... | 08/15/1978 |
| 4094959 | Process measurement and control In the measurement of a variable process parameter and control of the process in response thereto, a transform of a process parameter measurement signal that can be described as the time derivative of a second order or higher lagged process parameter meas... | 06/13/1978 |
