Class 23/293S - Sulfur

Subclass of Class 23 - Chemistry: physical processes
No. of patents: 45
Last issue date: 03/25/2008

Number	Title	Issue Date
7347945	Method and an installation for separating out multiphase effluents The invention relates to a method and to an installation for separating out an effluent made up of a multi-phase fluid mixture. According to the invention, said installation includes gravity separator means whose geometrical separation characteristics can be adjuste...	03/25/2008
6132484	Wet granulation method for generating fertilizer granules A method of wet granulation of fertilizer and other materials into granules. The method involves formation of the granule directly on the pan from the feedstock without intermediate steps or the use of seed materials. The result is a product having a comp...	10/17/2000
5928617	Process for removal of mercury contamination Process for removing mercury from a gas contaminated with mercury vapor, comprising the steps of cooling the contaminated gas, removing water vapor from the cooled gas and filtering the dehydrated gas through a medium comprised of pure elemental sulfur. T...	07/27/1999
5902474	Chloride assisted hydrometallurgical extraction of metal A process for the extraction of precious metals from a copper sulphide ore or concentrate, by treating a leach residue of the ore or concentrate, includes the steps of removing elemental sulphur from the leach residue to obtain a low sulphur residue and s...	05/11/1999
5897850	Process for removing elemental sulfur from a gas stream A process for the recovery of sulfur from a hydrogen sulfide containing gas, comprising oxidizing hydrogen sulfide with oxygen, and then reacting the product gas of this oxidation further by using at least two catalytic stages. The H2 S concent...	04/27/1999
5874055	Chloride assisted hydrometallurgical extraction of metal A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halogen ions and a source of bisulphate or sulphate ions, such...	02/23/1999
5869012	Chloride assisted hydrometallurgical extraction of metal A process for the extraction of zinc from a sulphide ore or concentrate containing copper and zinc includes subjecting the concentrate to pressure oxidation in the presence of oxygen and an acidic halide solution to obtain a resulting pressure oxidation s...	02/09/1999
5861099	Process for the filtration of suspensions containing sulfur To improve the separation of dispersedly precipitated sulfur from a washing solution used in the oxidative washing of hydrogen sulfide containing waste gases, the suspension is heated before filtration to about 45° C. to 70° C. Such heating causes the s...	01/19/1999
5807410	Process for removing elemental sulfur from a gas stream The invention relates to a process for removing elemental sulfur which is present in a gas in the form of vapor and/or entrained particles, in which process the gas to be treated is cooled. The gas to be treated is introduced into a heat exchanger at the ...	09/15/1998
5599373	Sulfur-based chemical soil-corrective in the form of pellets for agricultural use A sulfur-based, chemical soil-corrective or conditioner for agricultural use in the form of pellets, said product containing fly sulfur powder, at least 3% by weight of an inert compound selected from the group consisting of clay, bentonite, kaolin and mi...	02/04/1997
5338515	SO₂ sensor This invention is a process for detecting low concentration levels of sulfur oxides (SO2) in a flowing gas stream (typically a combustion exhaust gas stream) and a catalytic SO2 sensor system which may be used in that process....	08/16/1994
5290321	Process for preparation of granular μ-sulfur having improved flowability, as a vulcanizing agent of rubber composition An organic solvent alone or together with a rubber process oil is added to a powder of μ-sulfur, the mixture is granulated, and the granulation product is heated at a temperature lower than 120° C. to evaporate the organic solvent, whereby granular μ-s...	03/01/1994
5122351	Method and apparatus for removing H₂ S from a process gas and recovering sulfur A catalytic polyvalent metal redox solution can be recovered and re-used in a catalytic polyvalent metal redox solution H2 S-removal, sulfur production process by interposing a closed loop evaporator/condenser process and apparatus in the sulfu...	06/16/1992
5096683	Process of combusting an H₂ S-containing gas An H2 S-containing gas is combusted with oxygen in at least one burner, which discharges into a combustion chamber. The resulting mixed gases contain H2 S, SO2, free hydrogen and elementary sulfur and are at temperatures o...	03/17/1992
5071633	Method of improving handling characteristics of froth of elemental sulfur particles To improve the handling characteristics and dispersibility of a sulfur containing froth, especially a froth obtained from the regeneration step in a process for scrubbing out and oxidizing H2 S, there is added to the scrubbing liquor an ionic o...	12/10/1991
5071332	Sulphur granulator Sulphur is obtained to the desired granulation and at the same time cooled by means of a directed hollow cylindrical jet of melted sulfur, on either side of which, i.e., both inside and outside the cylinder of molten sulfur, there are two jets of cold wat...	12/10/1991
5049370	Process and apparatus for purifying elemental sulfur carried in an aqueous cake A cake containing sulfur and other materials in a base solvent, such as that resulting from a liquid redox hydrogen sulfide removal process, is purified to obtain elemental sulfur by preferential solubilization of the sulfur, employing a selected solvent ...	09/17/1991
5041275	Reduced acid buildup in moist sulfur during storage Moist particulate sulfur is subject to microbial oxidation during extended storage, resulting in an undesirable accumulation of sulfuric acid in the sulfur. Treatment of the sulfur with an antimicrobial agent reduces or prevents the formation of the acid....	08/20/1991
5004588	Process for removal of hydrogen sulfide from gaseous stream This invention provides a process for removing H2 S from the gaseous stream by contacting the stream with an aqueous solution of a water soluble oxidized polyvalent metal chelate catalyst in the presence of oxygen whereby the metal chelate cata...	04/02/1991
4965062	Hydrogen sulfide removal and sulfide recovery A process and apparatus for removing hydrogen sulfide from high pressure gas and recovering liquid sulfur, which includes reacting the H2 S with sulfite ions and an acetic acid-acid salt buffering system in an aqueous stream whereby liquid sulf...	10/23/1990
4944769	Process for the granulating of sulphur Sulphur is obtained to the desired granulation and at the same time cooled by means of a directed hollow cylindrical jet of melted sulfur, on either side of which, i.e., both inside and outside the cylinder of molten sulfur, there are jets of cold water, ...	07/31/1990
4935221	Water condenser/separator systems for Claus processes An apparatus and process are described for the cooling and condensing of sulfur and water vapors from a Claus gas below the sulfur freezing point (248° F.) at low pressure (	06/19/1990
4876079	Separation of a mixture of sulfur and alkaline solution and apparatus therefor For the separation of sulfur from a sulfur/alkaline solution suspension, the suspension is heated to a temperature above the melting temperature of the sulfur and is introduced under pressure into a separating tank 1, containing a separating chamber 8, al...	10/24/1989
4730369	Method and apparatus for melting and recovering sulfur in aqueous slurries Method and apparatus for recovering sulfur from an aqueous slurry. The slurry is passed downwardly through a shell-and-tube heat exchanger having vertically arranged tubes, wherein it is heated sufficiently to melt the sulfur. The liquid mixture leaving t...	03/15/1988
4722832	Sulfur recovery process A process for the recovery of sulfur from sulfur-bearing ores employing an aqueous leaching solution containing calcium monosulfide, calcium hydrosulfide or mixtures of such calcium sulfide species. The sulfur ore is contacted in an extraction zone with t...	02/02/1988
4647287	Recovery of sulfur from sulfur froth A sour gas obtained from an enhanced oil recovery is converted to sulfur slurry which is concentrated for easy filtration, or for direct disposal, by the addition of substantially small amounts of a solid flocculating agent e.g. clay, optionally in combin...	03/03/1987
4631068	Removal of sulfur from aqueous suspension using filtration There is disclosed a process for the removal of sulfur from an aqueous sulfur-containing suspension through sulfur coalescence. Sulfur coalescence is initiated by passing the aqueous sulfur-containing suspension through a multi-passage filtering media. In...	12/23/1986
4597609	Method of melting sulphur A method of melting sulphur, in block form, uses a heating device having lower heating surfaces and means for withdrawing sulphur. The device is positioned on a block of sulphur so that the heating surface(s) are inclined downardly to a collection locatio...	07/01/1986
4595350	Process and apparatus for preparing sulfur having uniform particle size distribution A process and apparatus for preparing a porous, particulate sulfur by combining a coherent molten sulfur stream with a coherent water stream to provide an aqueous slurry of a porous, particulate sulfur having a uniform particle size distribution. In the p...	06/17/1986
4534955	Sulfur extraction process An improved solid-liquid separation step for use in connection with the Stretford process introduces a small amount of an additive which is then emulsified and mechanically treated in a colloid mill or processed through an air dissolver before introductio...	08/13/1985
4518576	H₂ S Removal from gas streams A cyclic process and composition for the removal of hydrogen sulfide from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with a specified reactant solution and a combination crystal modifier of phosphate and t...	05/21/1985
4515764	Removal of H₂ S from gaseous streams A cyclic process and composition for the removal of hydrogen sulfide from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with a specified reactant solution and a combination crystal modifier of phosphate and t...	05/07/1985
4508537	Method for removing elemental sulfur particles from the aqueous washing solution of a hydrogen sulfide removal process A method is provided for removing elemental sulfur particles from a hydrogen sulfide removal process which employs a regenerable, aqueous washing solution capable of absorbing hydrogen sulfide from an industrial gas stream and converting that hydrogen sul...	04/02/1985
4383821	Automatic shutoff for sulfur melter apparatus A device for automatically shutting off a sulfur melter when its supply of sulfur is exhausted or when sulfur bridging has occurred is disclosed. The shutoff uses a temperature value sensed at the top of the melter's sloping melter bottom and shuts the he...	05/17/1983
4304570	Method of separation of sulfur from a scrubbing liquid A suspension of sulfur in a scrubbing liquid is preheated with steam to a temperature above the melting point of the sulfur so that the latter spontaneously melts in the suspension which is introduced into a separating chamber in a sealed vessel. The scru...	12/08/1981
4286966	Process for the melting of sulfur A method for the removal of moisture associated with sulfur and for the melting of solid sulfur. A flow of molten sulfur is circulated through a mixing device in a substantially spiral flow wherein the circulating molten sulfur forms a continuous vortex o...	09/01/1981
4234318	Process for granulation of sulfur A process for the production of granular sulfur in a rotating drum in which molten sulfur at a temperature within the range of about 110° to 160° C. is sprayed in a contact zone onto a bed of moving sulfur particles and a continuous curtain of said part...	11/18/1980
4171200	Process and apparatus for in situ melting of sulphur from solid sulphur storage block This invention relates to a method and apparatus for the in situ melting and removal of liquid sulphur from a solid sulphur storage block. The method comprises supplying heat to the storage block sufficient to melt the sulphur of the storage block to prod...	10/16/1979
4139347	Method for cooling molten sulphur Molten sulphur is cooled to as low as 5° F above its solidification temperature without being in direct contact with the heat exchange liquid. Such liquid is recirculated and is initially cooled to a first temperature below the solidification temperature...	02/13/1979
4137938	Method and apparatus for transmitting liquid suphur over long distances Movement of liquid sulphur requires a considerable heat source to maintain the sulphur in liquid form. The present application and method utilizes an outer steel pipe having a liquid sulphur inlet at one end and a liquid sulphur outlet at the other end an...	02/06/1979

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Class 23/293S - Sulfur