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| Number | Title | Issue Date |
| 7374590 | Reducing sulfur dioxide emissions from coal combustion A process of treating high sulfur coal to reduce sulfur dioxide emission when the high sulfur coal is burned comprising placing coal in pressure tank (16) of reduced pressure sufficient to fracture a portion of the coal by withdrawing ambient fluids trapped w... | 05/20/2008 |
| 7276217 | Reduction of coal-fired combustion emissions A process for mitigation of fouling deposits within a combustion zone, capturing of toxic metal emissions, and reduction of visible sulfur emissions attributable to sulfuric acid mist during coal combustion. SO3 formed during coal combustion is reduced by... | 10/02/2007 |
| 7101410 | Method for the microbiological desulfurization of fossil fuels A microbiological method of desulfurization (MDS) of hydrocarbon fuels such as coal, coal tar and petroleum uses an aqueous microbial biocatalytic agent which is not significantly reproducing but is still capable of oxidizing inorganic sulfur compounds and/or of sel... | 09/05/2006 |
| 7056359 | Process for modifying coal so as to reduce sulfur emissions A method of manufacturing a coal product having reduced sulfur emissions including the steps of grinding coal into a powder form having a desired particle size; blending the ground coal with hydrated lime; adding water to the blend so as to have a moisture content o... | 06/06/2006 |
| 6461859 | Enzymatic oxidation process for desulfurization of fossil fuels The invention relates to a method of removing thiophenic and organosulfide compounds from a fossil fuel comprising the steps of contacting the fossil fuel with hemoproteins, which oxidize the sulfur containing compounds to sulfoxides and sulfones in a rea... | 10/08/2002 |
| 6068737 | Simultaneous demetallization and desulphuration of carbonaceous materials via microwaves The process of demetalization and desulphuration of a mixture of carbonaceous material in an acid medium subjecting the mixture to the influence of wave energy in the microwave range, recovering, afterwards, the sulphur and separating the treated material... | 05/30/2000 |
| 5795484 | Method and apparatus for dewatering An ultra-fine coal particle fraction forms a coal product with particles that are dilatant due to the mechanical stripping of the clay contaminates from the coal surface and the subdividing of the clay to clay platelets which are peptized to maintain disc... | 08/18/1998 |
| 5676711 | Oil conversion process An improved process for producing a low-sulfur fuel oil or gas from used oil and finely divided coal. After mixing, the coal/oil slurry is heated within a pressure vessel to a temperature of approximately 850° F. and the pressure increased to approximate... | 10/14/1997 |
| 5578092 | Method and a device for producing fuels A method for producing fuels based on solid carbonaceous natural fuels which are particularly suited for non-polluting thermal power generation with gas and steam turbines in a combined cycle which is characterized in that the flow of finely-divided natur... | 11/26/1996 |
| 5575824 | Coal preparation device The present invention provides for a fuel coal processing system having a centrifugal type coal pulverizer and an electrostatic type coal purifier and an optional fuel coal size classifier all combined into one integral, cooperatively acting fuel coal pre... | 11/19/1996 |
| 5573556 | Conversion of solid carbonaceous material using polyoxoanions A process for the conversion of solid carbonaceous materials, such as coal, to liquid products using one or more polyoxoanions selected from those represented by: [(Cn H2n+1)4 N]a Mb Oc Hd | 11/12/1996 |
| 5529587 | Fluidized oxydesulfurization of coal The method of the subject invention comprises a method and apparatus for removing sulfur in coal prior to combustion. In a fluid bed reactor, coal particles pass through a gaseous medium of air and superheated steam in a fluidized state under pressure. A ... | 06/25/1996 |
| 5509945 | Mild desulfurization of sulfur-bearing materials A method for the removal of sulfur from sulfur-bearing materials such as coal and petroleum products using organophosphine and organophosphite compounds is provided.... | 04/23/1996 |
| 5505746 | Method of treating coal to reduce sulphur and chlorine emissions Methods and compositions are provided for treating coal to reduce the emissions of sulphur dioxide and hydrogen chloride gases upon combustion. In the subject method, coal is washed with a calcium anion wash solution, such as calcium hydroxide solution, a... | 04/09/1996 |
| 5496465 | Vibrating bed coal pyrolysis system A vibrating bed pyrolysis system has a vibrating bed which is supplied with hot solid particles. Dry coal particles are rapidly heated by the hot solid particles to drive off hydrocarbon vapors. The vapors are condensed in a jet condenser, and products ar... | 03/05/1996 |
| 5458659 | Desulfurization of carbonaceous fuels First, nitrogen oxides are reduced by firing coal in substoichiometric air conditions in a first stage oxidation unit of a combustor to reduce NOx from fuel bound nitrogen. Hydrated lime, Ca(OH)2, is introduced into the first stage o... | 10/17/1995 |
| 5437696 | Method of removal of sulfur from coal and petroleum products A method for the removal of sulfur from sulfur-bearing materials such as coal and petroleum products using organophosphine and organophosphite compounds is provided.... | 08/01/1995 |
| 5393311 | Method and apparatus for desulfurizing coal A method and apparatus for desulfurizing coal is provided. The method involves combining non-pulverized sulfur containing coal with an adsorbent material, such as aluminum oxide, in a vessel, irradiating the coal/adsorbent combination with microwave energ... | 02/28/1995 |
| 5387523 | Multistage process for deep desulfurization of fossil fuels A method of deeply desulfurizing a fossil fuel which contains a variety of organic sulfur compounds, some of which are labile to hydrodesulfurization (HDS) and some of which are refractory to HDS, comprising the steps of (a) subjecting the fossil fuel to ... | 02/07/1995 |
| 5368617 | Process for reducing sulfur emissions with calcium-containing sorbents An improved process for reducing sulfur oxide emissions from the combustion of coal is disclosed wherein a fuel mixture comprising calcium-containing sorbent and coal is fed to the burners and sulfur oxides react with calcium from the sorbent in a high te... | 11/29/1994 |
| 5358869 | Microbial cleavage of organic C-S bonds A microbial process for selective cleavage of organic C--S bonds which may be used for reducing the sulfur content of sulfur-containing organic carbonaceous materials, Microorganisms of Rhodococcus rhodochrous and Bacillus sphaericus have been found which... | 10/25/1994 |
| 5350431 | Process for chemical desulfurization of coal A process for chemical desulfurization of coal, in which coal is brought into contact with a desulfurizing agent after or while the coal is irradiated with ultraviolet light, thereby to give remarkably high desulfurization ratios and remarkably high yield... | 09/27/1994 |
| 5316751 | Methods for mine tailing clean-up using recovery technologies A method for site remediation for mitigating contamination from metals or metal compounds, particularly resulting from the situation of mine tailing waste on or near water sources, including the reprocessing and redeposit of separated sands and slimes in-... | 05/31/1994 |
| 5277368 | Coal cleaning process Fine particle coal is beneficiated in specially designed dense medium cyclones to improve particle acceleration and enhance separation efficiency. Raw coal feed is first sized to remove fine coal particles. The coarse fraction is then separated into clean... | 01/11/1994 |
| 5248413 | Process for removing sulfur and producing enhanced quality and environmentally acceptable products for energy production from coal A process for producing enhanced quality adsorbent carbons and environmentally acceptable materials for energy production from coal includes an initial step of physically cleaning the coal to remove organic sulfur and mineral tailings. Next, a coal slurry... | 09/28/1993 |
| 5246470 | Removal of sulfur from coal and pitch with dolomite The sulfur in bituminous coal can be converted to calcium sulfate instead of sulfur dioxide during combustion when it is mixed with petroleum pitch and calcium oxide, calcium carbonate or dolomite.... | 09/21/1993 |
| 5217503 | Process for desulfurization of coal and ores An additional step directed to the Starbuck process of desulfurizing coal and ores, as described and claimed in reissue patent No. RE. 32,454 dated Jul. 7, 1987, including the treatment of non-weathered coal ore to simulate weathered coal ore. Several app... | 06/08/1993 |
| 5127586 | Method of magnetic separation and apparatus therefore A method and apparatus for magnetically beneficiating a raw sample, such as coal or lunar soil is disclosed. The beneficiation is achieved using a novel of fractionating the sample into components of different magnetic susceptibilities. The results of the... | 07/07/1992 |
| 5123931 | Coal recovery process A method for the beneficiation of coal by selective agglomeration and the beneficiated coal product thereof is disclosed wherein coal, comprising impurities, is comminuted to a particle size sufficient to allow impurities contained therein to disperse in ... | 06/23/1992 |
| 5094668 | Enzymatic coal desulfurization Coal is desulfurized by oxidation to convert organic sulfur moieties in the coal matrix to sulfates, and by treatment with a sulfatase to cleave the sulfates and thereby remove organic sulfur.... | 03/10/1992 |
| 5092909 | Biodesulphurization process utilizing bacteria Method and apparatus for treating sulphur bearing coal comprising pulverizing the coal, mixing it with water, a reagent and free air and pumping the resulting mixture to a classifier to separate the coal from sulphur and clay, all at the mine site. The re... | 03/03/1992 |
| 5085764 | Process for upgrading coal In a process for reducing the sulfur and ash contents of coal, coal is sequentially contacted with fused alkali metal caustic, wash water, and acid. Contacting the coal with the caustic produces water-soluble compounds. Sufficient wash water is used to re... | 02/04/1992 |
| 5059307 | Process for upgrading coal In a process for reducing the sulfur and ash contents of coal, coal is sequentially contacted with fused alkali metal caustic, water, carbonic acid, and a strong acid. Caustic removed from the coal by the water and the carbonic acid is recovered as anhydr... | 10/22/1991 |
| 5049163 | Process for reducing sulphur dioxide emission from burning coal containing sulphur This invention discloses a process for reducing sulphur dioxide emission from burning coal containing sulphur. In the disclosed process, pulverized combustible materials, such as coal, wood flour, combustible plant, charcoal, etc., and a sulphur trapping ... | 09/17/1991 |
| 5037450 | Method and apparatus for desulfurizing and denitrifying coal An apparatus and process for desulfurizing and denitrifying coal by pyrolysis and subsequently treating the gaseous pyrolysis by-products with a solid sorbent to substantially reduce the release of SOx gases to acceptable levels. In one aspect ... | 08/06/1991 |
| 4983187 | Method for preparing a high-concentration solids suspension in water A method is described for preparing a high-concentration solids suspension, in particular coal or petroleum coke, which can be transported by pipe and be burnt with low emission of harmful substances, comprising crushing the solid to be suspended to a max... | 01/08/1991 |
| 4946658 | Addition of pyritic materials to feed mix for desulfurization of phosphogypsum A pelletized mixture of gypsum, carbonaceous material and pyrite is charged to a travelling grate where the charge is heated under suitable conditions to produce a solid sintered material which has a broad spectrum of applications due to its chemical and ... | 08/07/1990 |
| 4915706 | Coal-water fuel production A process and apparatus for producing coal-water fuel comprises crushing and primary grinding of the coal to form a liberated granular material, multiple stage froth flotation of the granulated coal to reduce its ash content and pyritic sulfur content. Th... | 04/10/1990 |
| 4888029 | Desulfurization of carbonaceous materials A process for desulfurizing carbonaceous material containing inorganic bound sulfur, organic bound sulfur, or conbinations thereof. The process comprises reacting the carbonaceous material at desulfurization conditions with a hydrogen source material in t... | 12/19/1989 |
| 4886519 | Method for reducing sox emissions during the combustion of sulfur-containing combustible compositions This invention relates to the reduction of oxidized sulfur compound (SOX) emissions produced during combustion of sulfur (S)-containing combustible compounds. More particularly, this invention provides a method for reducing such emissions wherein the comb... | 12/12/1989 |
