Abstract: Process for the catalytic oxidation of a saturated hydrocarbon to obtain a ketone which involves carrying out the oxidation simultaneously with the oxidation of H.sub.2 S to form elemental sulfur and the ketone.

Abstract: The present invention discloses a method of selectively oxidizing hydrogen sulfide to elemental sulfur, in which a H.sub.2 S-containing gas mixture contacts with an oxygen-containing gas at 50.degree.-500.degree. C. in the presence of an iron-based catalyst. The reaction product mixture contains substantially no sulfur dioxide. The iron-based catalyst, in addition to iron atom, further contains a promoter of cerium, tin or antimony.

Abstract: Sulfur compounds are removed from gaseous carbon dioxide by contacting the carbon dioxide with water vapor in the presence of a carbonyl sulfide hydrolysis catalyst, thereby converting carbonyl sulfide in the gas stream to hydrogen sulfide, contacting the resulting gas stream with ferric oxide, thereby removing hydrogen sulfide from the gas stream as elemental sulfur, and contacting the remaining gas stream with copper oxide, zinc oxide or mixtures of these, thereby removing any remaining sulfur compounds from the gaseous carbon dioxide.

Abstract: A solid, porous catalyst for the selective oxidation of hydrogen sulfide to sulfur has the atomic proportions covered by the formula Fe.sub.A Mg.sub.B Zn.sub.C Cr.sub.D wherein A has a value of 0.5 to 10, B has a value of 0.1 to 1, C has a value of 0 to 1, and D has a value of 0 to 1, where B+C=1. The catalyst is used by passing a gas stream comprising hydrogen sulfide and oxygen over the catalyst at a temperature above the dew point of sulfur and up to no more than 300.degree. C.

Abstract: A method of separating sulphur compounds out of a gas containing carbon dioxide and hydrogen sulphide, in a gas washing system, said gas being obtained by gasification of spent cellulose liquor. According to the invention the gas washing system has a gas-liquid contact zone (5) operating at a pressure exceeding atmospheric pressure as well as a regeneration zone (8) operating at a pressure substantially less than the pressure in the gas-liquid contact zone (5). The carbon dioxide partial pressure in the gas prior to entering the gas-liquid contact zone exceeds 0.2 atm. Furthermore the gas comes into contact with an alkaline absorption liquid in the gas-liquid contact zone, and alkaline liquid containing alkali hydrogen sulphide is withdrawn from the gas-liquid contact zone and transferred to the regeneration zone, in which zone hydrogen sulphide is expelled from said liquid containing alkali hydrogen sulphide and withdrawn in the form of a gas.

Abstract: A hot gas cleanup system for removing particulates, alkali and sulfur from fuel gas produced by the gasification of coal in a gasifier, especially in an integrated gas turbine gasification power plant. A calcium based sulfur sorbent and an alkali sorbent are injected directly into the fuel gas and then recovered, along with the used sorbent, in a high efficiency, high temperature ceramic barrier filter. The fuel gas is then subjected to further de-sulfurization in a polishing de-sulfurizer supplied with a copper based sulfur sorbent. The used copper based sorbent is regenerated in fluidized bed regenerator. The regenerated sorbent is returned to the polishing de-sulfurizer and sulfur dioxide produced by the regeneration is directed to an oxidizer to which the used and unused sulfur sorbent from the filter is supplied so that the sulfur dioxide can be captured and so that the used sulfur sorbent can be converted to a more stable form for disposal.

Abstract: The present invention provides a method for separately removing mercaptans and hydrogen sulfide from a hydrocarbon gas stream by passing the gas through a bed which includes iron oxide which catalyzes the formation of disulfides and trisulfides from mercaptans and also reacts with at least part of the hydrogen sulfide to form acid-stable solids; causing the di- and trisulfides to exit the bed in the gas phase; and removing and recovering the di- and trisulfides by adsorption or condensation. Any remaining hydrogen sulfide may be scavenged from the gas stream by passage through a bed containing iron oxide similar to that used first above. If the gas stream contains substantial amounts of hydrocarbon aerosols, they should be filtered out in advance of the bed.

Abstract: Disclosed are, in a method for purifying a high-temperature reducing gas in which sulfur compounds present in a high-temperature reducing gas are absorbed and removed by an absorbent according to a dry method, a method for purifying a high-temperature reducing gas which is characterized in that a reducing gas is supplied into a gas containing sulfur dioxide gas which is discharged from a regeneration system for regenerating the absorbent which system forms a system together with an absorption system in which the sulfur compounds are absorbed with the absorbent, a resulting gas mixture is led through a reactor filled with a catalyst, the sulfur dioxide gas and the reducing gas are let react with each other under pressurization so that elemental sulfur is directly produced and recovered as liquid sulfur; and the above method which is further characterized in that catalyst layers in the reactor in which the sulfur dioxide gas and the reducing gas react with each other are divided into parts or made to have a plu

Abstract: A process for purifying high-temperature reducing gases containing sulfureous contaminants including hydrogen sulfide and carbonyl sulfide with an absorbent, said process characterized in that at least three reactor towers which are filled with an absorbent are used, and said process comprises the three steps of absorption, regeneration, and reduction, and during in a part of operation two reactor towers are connected in series so as to carry out regeneration, and O.sub.2 concentration can be controlled separately for each regenerating reactor tower in the regeneration step, and steam can be supplied so as to prevent excessive reduction of the absorbent from occurring in the reduction step. The life of the absorbent can be extended and operational costs may be reduced.

Abstract: A process for removing Total Reduced Sulfur compounds from a gaseous stream such as those containing natural gas, industrial gas, and digester gas by oxidation with a fine flocculent acidic catalyst slurry which is regenerable during the process by pH adjustment in the absence of added heat. The catalyst slurry comprises MnO.sub.2, Mn.sub.2 O.sub.3, and Mn.sub.3 O.sub.4 having pH in the range from about 0.5 to about 6.5 and is prepared by oxidizing a divalent manganous salt in an aqueous solution having a pH in the range from about 8.0 to about 13.5 with an oxygen-containing gaseous stream.

Abstract: A process for the rejection of carbon dioxide from a natural gas feedstream comprising a gas permeable membrane and a multiple bed pressure swing adsorption system to produce a fixed gas product having a desired concentration of carbon dioxide. The permeate stream from the gas permeable membrane system is fed to the PSA unit and a stream essentially free of carbon dioxide gas from the PSA unit is compressed and blended with the non-permeate stream to form the mixed gas product.

Abstract: The regeneration of sulfur sorbents having sulfate forming tendencies and used for desulfurizing hot product gas streams such as provided by coal gasification is provided by employing a two-stage regeneration method. Air containing a sub-stoichiometric quantity of oxygen is used in the first stage for substantially fully regenerating the sorbent without sulfate formation and then regeneration of the resulting partially regenerated sorbent is completed in the second stage with air containing a quantity of oxygen slightly greater than the stoichiometric amount adequate to essentially fully regenerate the sorbent. Sulfate formation occurs in only the second stage with the extent of sulfate formation being limited only to the portion of the sulfur species contained by the sorbent after substantially all of the sulfur species have been removed therefrom in the first stage.

Abstract: A packed mass transfer tower for establishing intimate gas/liquid contact and efficient mass transfer that is less susceptible to gas or liquid channeling, gas surging and uneven distribution of gas or liquid across the cross-sectional area of the tower. The packed tower includes a packing arrangement including a lower bed of mobile packing elements, and an adjacent upper bed of fixed packing elements. The packed bed of fixed packing elements acts as a gas distributor, as well as causing good gas/liquid contact, to provide an even flow of gas across essentially the entire cross-sectional area of the packed bed of mobile packing elements.

Abstract: A packed mass transfer tower for establishing intimate gas-liquid contact and efficient mass transfer that is less susceptible to gas or liquid channeling, gas surging and uneven distribution of gas or liquid across the cross-sectional area of the tower. In one embodiment, the packed tower includes a packing arrangement including a loosely packed bed of mobile packing material, and an adjacent, tightly packed bed of mobile packing material. The relatively tightly packed bed of mobile packing material acts as a gas distributor, as well as being a material that causes good gas-liquid contact, to provide an even flow of gas across essentially the entire cross-sectional area of the loosely packed bed of mobile packing material. In another embodiment, mobile packing elements and fixed packing elements are intermixed between the same spaced fluid-pervious grids.

Abstract: A packed mass transfer tower for establishing intimate gas-liquid contact and efficient mass transfer that is less susceptible to gas or liquid channeling, gas surging and uneven distribution of gas or liquid across the cross-sectional area of the tower. The packed tower includes a mobile bed mass transfer stage including a packed bed of mobile packing material, such as hollow spheres.

Abstract: A novel iron chelate treating solution containing a specified ferric chelate, and process for converting H.sub.2 S, are described.

Abstract: Non-hydrated iron oxides utilized in moistened permeable beds to react hydrogen sulfide present in natural gas do not totally lose their reactivity when the beds give up their moisture to dry gas. Lessening of their reactivity attendant to dryness is signalled by a rise in H.sub.2 S level in the gas at or somewhat in advance of the reactor outlet. On such signal water is injected into the inflowing gas stream, reviving the bed's reactivity and permitting continuation of gas sweetening until the reactive potential of the oxide is substantially fully utilized, with minimal water addition.

Abstract: Hydrogen sulfide is removed from a gas by contacting it with an absorbent composition consisting essentially of a mixed oxide of iron, zinc and nickel and an inorganic binder.

Abstract: A precipitate composition comprising a water-insoluble phosphate of at least one metal selected from the group consisting of Ti, Zr and Sn, and a hydroxide of at least one metal selected from the group consisting of Fe, Co., Ni, Zn and Cu.The precipitate composition of the invention can be used as an adsorbent composition, which shows high adsorption capacity for acidic malodorous gases, such as hydrogen sulfide, as well as alkaline malodorous gases, such as ammonia.

Abstract: An apparatus and method of contacting a liquid with different gases sequentially in separate mass transfer zones within a single vessel, the mass transfer zones operatively connected in liquid communication with each other, including intimately contacting the liquid with a first process gas in cocurrent flow in a first mass transfer zone to effect mass transfer between the first liquid and the process gas, and introducing the liquid into a second mass transfer zone with a second gas, different from the first gas, in cocurrent flow with the second liquid, thereby effecting mass transfer between the second liquid and the second gas.

Abstract: In a method for absorbing and removing sulfur compounds such as hydrogen sulfide and carbonyl sulfide present in a high-temperature reducing gas using an absorbent,disclosed is a method for purifying a high-temperature reducing gas which is characterized in that: said method uses at least four towers of reactors filled with an absorbent and comprises four steps which are an absorption step for absorbing and removing sulfur compounds with an absorbent, a regeneration step for regenerating said absorbent using a gas containing oxygen, a cooling step after the regeneration step, and a reduction step for reducing said regenerated and cooled absorbent with a high-temperature reducing gas until the concentration of the reducing gas becomes uniform before and after passing through the absorbent; heat is continuously recovered from the high-temperature gas at the outlet of the regeneration reactor in said regeneration step; and the regeneration and absorption performance is thus stabilized.

Abstract: The invention relates to a process for the removal of hydrogen sulfide from gases by passing the gases in the presence of oxygen and steam over a catalytic absorption mass which contains inert porous support materials as support and catalytically active metal sulfides and/or metal oxides for the selective oxidation of hydrogen sulfide to elemental sulfur, the sulfur formed being simultaneously deposited on the absorption mass, and regenerating the charged catalytic absorption mass.

Abstract: A method and apparatus for removing H.sub.2 S from a process gas, including a reaction chamber between an absorption chamber and an oxidizer chamber, in the polyvalent metal redox catalyzed removal of H.sub.2 S from a process gas. The process and apparatus of the present invention inclues a first gas-liquid mass transfer zone or absorber chamber for intimately containing an H.sub.2 S-containing process gas with an oxidized polyvalent metal redox solution for absorption of the H.sub.2 S; and a reaction chamber in fluid communication with polyvalent metal redox solution exiting the absorption chamber through a valve-controlled cross-flow conduit. Cross flow of solution from the absorber chamber through a valve or other circulation control device to the reaction chamber provides controlled, continuous and sequential gas-liquid contact with two or more different gases in separate absorption, reaction and oxygenation zones within a single or multiple vessels.

Abstract: A method and apparatus including a reaction chamber interposed in a polyvalent metal redox solution flow path between an absorber chamber and an oxygenation chamber, including one or more oxygenation stages, for contact in the reaction chamber of H.sub.2 S-laden catalytic polyvalent metal redox solution form the absorber chamber with highly oxidized polyvalent metal redox solution from the last oxygenation stage to accomplish oxidation of the dissolved H.sub.2 S species by interaction with the oxidized redox catalyst essentially in the absence of gaseous dissolved oxygen. The highly oxidized polyvalent metal redox solution, including Fe.sup.+3 or V.sup.+5, contacts the H.sub.2 S-laden solution from the absorber chamber for reoxidation of the dissolved HS.sup.-, S.sup.= and any of the polyvalent metal sulfur compounds (presumably a chelated iron sulfide or a vanadium sulfide), to avoid formation of sulfate or thiosulfate salts which reduce the yeild of sulfur and build up in the solution.

Abstract: A dry type simultaneous desulfurization and dedusting method directed to forming moving beds with granulate desulfurizing and dedusting agent containing as the principle composition 5-95 weight % of iron oxide and 95-5 weight % of metallic iron, and contacting these moving beds with the gas containing hydrogen sulfide and dust, thereby simultaneously desulfurizing and dedusting the gas.

Abstract: A method and apparatus for manufacturing silver halide grains wherein a water-soluble silver salt solution and a water-soluble halide solution are separately introduced within a hollow cylindrical structure open at each end which is rotatable mounted about its longitudinal axis within a reaction vessel containing a colloidal aqueous solution. The colloidal aqueous solution within the cylindrical structure is stirred and mixed during the addition of the silver salt solution and halide solution and the silver halide grains which form within the cylindrical structure are immediately discharged into the colloidal aqueous solution between the outer circumference of the cylindrical structure and the reaction vessel through slits in the circumference of the cylindrical structure.

Abstract: What is disclosed is a method of oxygen removal employing at least one solid bed of oxygen removal chemical; for example, Fe.sub.2 S.sub.3 on wood chips. Also disclosed are preferred embodiments in which are employed within the at least one bed a temperature sensor, a controller is connected with the temperature sensor and a gas operated control valve is connected with the controller such that the valve is operated to shut off the valve to the sales line if the temperature sensed is greater than a preset temperature; e.g. 150 degrees Fahrenheit.

Abstract: The present invention is directed to a method for purifying a high-temperature reducing gas by continuously circulating the processes of reducing a regenerated absorbent with the high-temperature reducing gas, until concentrations of aimed reducing gases have become uniform on upstream and downstream sides of the absorbent, and absorbing sulfur compounds by the use of this absorbent and thereby removing these sulfur compounds therefrom; the aforesaid method being characterized by using at least three reactors filled with the absorbent, by consisting of the four steps of reduction, absorption, SO.sub.2 reduction and regeneration, and by comprising the steps of feeding a circulating gas from the regenerating step to the SO.sub.2 reducing step; converting an SO.sub.2 gas produced in the regenerating step and the SO.sub.2 reducing step into elemental sulfur and recovering the latter as liquid sulfur; and introducing a part of the SO.sub.2 gas into the reducing step and returning the remaining SO.sub.

Abstract: A process for the removal of carbon dioxide, hydrogen sulfide and alkyl mercaptans from a hydrocarbon-containing feed gas:(a) contacting the feed gas with an adsorbent capable of removing hydrogen sulfide and alkyl mercaptans from the feed gas at effective conditions to produce a treated gas having reduced concentrations of hydrogen sulfide alkyl mercaptans;(b) contacting the treated gas with a liquid medium capable of removing carbon dioxide hydrogen sulfide and alkyl mercaptans from the treated gas at effective conditions to produce a product gas having reduced concentrations of carbon dioxide hydrogen sulfide and alkyl mercaptans;(c) contacting a spent absorbent laden with hydrogen sulfide and alkyl mercaptans with a normally liquid fraction at effective desorption conditions to produce a regenerated adsorbent and a regeneration effluent having increased concentrations of hydrogen sulfide and alkyl mercaptans; and(d) utilizing the regenerated adsorbent as at least a portion of the adsorbent in step (a).

Abstract: Hydrogen sulphide is removed (for example from drilling muds) using porous iron oxides which consist to the extent of at least 80% by weight of Fe.sub.3 O.sub.4 and in which at least 10% of their pore volume is in the form of pores of diameters in the range from 2000 to 6000 .ANG..

Abstract: There is disclosed an improved method for the purification of H.sub.2 S containing gases, which comprises the steps of (1) oxidizing a solution of ferrous sulfate into a solution of ferric sulfate with the aid of an iron-oxidizing bacterium; (2) absorbing the H.sub.2 S in the gas by the solution of ferric sulfate by bringing the gas into contact with the solution; (3) separating and recovering the elemental sulfur produced in the solution during the second step; and (4) returning the solution of ferrous sulfate, which is obtained in the third step in an elemental sulfur free state, to the first step to be oxidized again into a solution of ferric sulfate, said method being characterized in that the oxidation in the first step is carried out in a fixed-bed type oxidation vessel which is filled with a bacterium support onto which an iron-oxidizing bacterium has been deposited.

Abstract: An add-on H.sub.2 S trap for use after an auto exhaust catalyst has an H.sub.2 S-getter metal oxide which traps the H.sub.2 S by the following reaction:MO+H.sub.2 S.fwdarw.MS+H.sub.2 Oand the H.sub.2 S-getter metal oxide is self-regenerating via the following reaction: ##STR1## The H.sub.2 S-getter metal oxide has little tendency to form sulfates at a temperature greater than approximately 500.degree. C. Preferred metal oxides are iron, nickel and cobalt and they can be distended over a support.

Abstract: A novel process for removing the sulphur contained in a gaseous compound by absorbtion from at least part of the waste gas of a reduction shaft furnace (1) for iron ore is described. The waste gas is initially cleaned in a scrubber (13) and cooled, followed by desulphurization, during which the sulphur-absorbing material is constituted by part of the sponge iron produced in the reduction shaft furnace. Desulphurization advantageously takes place at a temperature in the range 30.degree. to 60.degree. C. It is preferably carried out on the CO.sub.2 separated from the blast furnace gas and the blast furnace gas part used as export gas.

Abstract: In wastewater treatment plants it is conventional to use gas "scrubbers" to remove hydrogen-sulfide gas from digester gas. The reactive scrubbing medium in such digester-gas scrubber vessels is generally iron-oxide "sponge," which is exhausted in use and which is both difficult and dangerous to regenerate. In accordance with the present invention, the spent iron-oxide sponge is immersed in liquid--by filling the scrubber vessel with the liquid--and a regenerating gas is then bubbled through the liquid and the iron-oxide sponge together. The liquid may be water, and the regenerating gas may be air or pure oxygen. The liquid absorbs heat from the regeneration reaction and conducts it out of the iron-oxide medium, eliminating the danger of combustion or explosion without impeding the progress of the reaction. The regenerating gas is applied through a diffuser structure from below.

Abstract: Adding sodium sulfite in the slurry of the iron oxide slurry process for scavenging hydrogen sulfide described in U.S. Pat. No. 4,246,244, eliminates excessive foaming on start-up, stabilizes the suspension of the oxide particles in the slurry, lessens clogging of reacted particles, which otherwise interferes with cleaning out the reactor vessel, and so materially buffers the slurry as to minimize corrosion of the reactor vessel and piping. Further, adding small amounts of oxygen to the gas stream, which would be expected to cause corrosion, does not do so; instead it prolongs the usefulness of the reactant oxide particles and affords increased acid-stability to the reaction products.

Abstract: A process for the simultaneous partial oxidation and desulfurization of an ash-containing solid carbonaceous fuel comprising (basis solid fuel) 0.2 to 8.0 wt. % sulfur and 0.1 to 30 wt. % of silicate compounds for the production of gaseous mixtures comprising H.sub.2 and CO and entrained molten slag. In the process, the solid carbonaceous fuel and supplemental iron-containing material are reacted by partial oxidation in the reaction zone of a free-flow unobstructed down-flowing vertical refractory lined gas generator with a controlled amount free-oxygen containing gas and a temperature moderator so that an equilibrium oxygen concentration is provided in the gas phase in the reaction zone having a partial pressure which is less than about 10.sup.-7 atmospheres. The partial oxidation and desulfurization reactions take place simultaneously at a temperature which is above 1900.degree. F. and about 10.degree. to 200.degree. F. above the fluid temperature of the slag at an increased thermal efficiency.

Abstract: Synthesis gas, fuel gas, or reducing gas is produced by the noncatalytic partial oxidation of a sulfur-containing liquid hydrocarbonaceous fuel or a slurry of sulfur-containing solid carbonaceous fuel with a free-oxygen containing gas in the free-flow reaction zone of a refractory lined gas generator at an autogenous temperature in the range of about 1900.degree. F. to 2900.degree. F. and above the ash-fusion temperature of the slag formed in the reaction zone, so that about 75 to 95 weight percent of the carbon in the fuel feed to the reaction zone is converted into carbon oxides. At least a portion of the hot effluent gas stream from the reaction zone is passed through a free-flow radiant cooler in admixture with an iron-containing additive. In the radiant cooler at least a portion of the sulfur-containing gases e.g. H.sub.2 S and COS react with the iron-containing additive to produce particulate matter comprising iron oxysulfide.

Abstract: The gasification of sulfur-bearing coal produces a synthesis gas which contains a considerable concentration of sulfur compounds especially hydrogen sulfide that renders the synthesis gas environmentally unacceptable unless the concentration of the sulfur compounds is significantly reduced. To provide for such a reduction in the sulfur compounds a calcium compound is added to the gasifier with the coal to provide some sulfur absorption. The synthesis gas from the gasifier contains sulfur compounds and is passed through an external bed of a regenerable solid absorbent, preferably zinc ferrite, for essentially completed desulfurizing the hot synthesis gas. This absorbent is, in turn, periodically or continuously regenerated by passing a mixture of steam and air or oxygen through the bed for converting absorbed hydrogen sulfide to sulfur dioxide.

Abstract: The invention provides a process for the removal of hydrogen sulphide from contaminated gas which comprises contacting contaminated gas with an aqueous ferric-ion solution in a first reactor, removing precipitated sulphur from the resulting aqueous iron-containing solution, oxidizing the aqueous iron-containing solution in a second reactor in the presence of an iron-oxidizing microorganism and separating resulting aqueous ferric-ion solution from the microorganism, characterized in that the pH of the aqueous iron-containing solution in the second reactor is maintained in the range 1.2 to 1.9, the total iron concentration in the aqueous solution is at least 15 kg/m.sup.3, and the aqueous ferric-ion solution is separated from the microorganism by ultrafiltration.

Abstract: Durable, porous sulfur sorbents useful in removing hydrogen sulfide from hot coal gas are prepared by water pelletizing a mixture of fine zinc oxide and fine iron oxide with inorganic and organic binders and small amounts of activators such as sodium carbonate and molybdenite; the pellets are dried and then indurated at a high temperature, e.g., 1800.degree. C., for a time sufficient to produce crush-resistant pellets.

Abstract: Methods and compositions are provided for simultaneous reduction of NO.sub.x and SO.sub.x in combustion effluents and process gas streams, employing a sorbent material of calcium or dolomitic lime hydrated with aqueous carboxamides, optionally with carbinol reductants, in amounts sufficient to reduce the NO.sub.x and SO.sub.x concentrations from the effluents. The sorbent material may be introduced as dry powders or wet hydrates in effluent streams at temperatures ranging from 400.degree. to 2400.degree. F.

Abstract: A desulphurization apparatus and method for natural gas in which red iron oxide is reacted with the sulphur compounds found in natural gas to remove these compounds from the gas. The treating solution is then recycled to regenerate the red iron oxide solution with elemental sulphur formed as a byproduct for removal.

Abstract: Hydrogen sulfide and/or carbonyl sulfide in a gas which does not substantially contain oxygen can easily be removed from the gas by contacting the gas with an activated carbon containing (1) a copper compound and (2) an alkali metal compound and/or alkaline earth metal compound at a temperature of not higher than 150.degree. C.

Abstract: A process for removing hydrogen sulfide from geothermal steam and from vent streams, or concentrated portions produced by a hydrogen sulfide separation process, includes the steps of introducing an oxygen-containing gas, such as air into the steam, or vent stream, and thereafter contacting the steam and oxygen-containing gas in a contacting stage with iron oxide supported by a carrier resistant to deterioration. The steam having a temperature of at least 250.degree. F. is mixed with oxygen to provide a molar ratio of oxygen-to-hydrogen sulfide ratio of less than about 10. During the contacting stage the pressure of the steam and oxygen-containing gas is maintained at a pressure sufficient to enable removal of a majority of the hydrogen sulfide from the steam and oxygen-containing gas.

Abstract: A process for purifying gases from hydrogen sulphide which comprises oxidation of hydrogen sulphide with air oxygen at a volume ratio between hydrogen sulphide to oxygen equal to 1:1-1.5 on a catalyst having the following composition, % by weight: titanium dioxide--10-30, iron oxide--20-30, zinc oxide--20-25, chromium oxide--20-50. The process is conducted at a temperature within the range of from 220.degree. to 260.degree. C. and at a space velocity of the gas mixture of from 3,000 to 15,000 hr.sup.-1.

Abstract: An acceptor of MnO.sub.x or iron oxide, wherein x has a value of from 1 to 1.5, supported on a (.gamma.)-alumina carrier which may contain silica, is used to remove hydrogen sulfide from process gases. The acceptor is regenerated with steam in a reducing atmosphere at a temperature of from 300.degree. C. to 700.degree. C.

Abstract: Process for removal of sulfur compounds from gases by passing the gases over an absorption mass which, on an inert support having a specific surface area of more than 10 m.sup.2 per g, contains metal oxides which react with hydrogen sulfide to give metal-sulfur compounds and at least 20% by weight of which metal oxides are present in finely divided form with a particle size of less than 40 nm. The gases are passed at a temperature of 5.degree. to 800.degree. C. over the support loaded with metal oxide, and the resultant support loaded with metal-sulfur compounds is regenerated by passing gases containing oxidizing agents over it.

Abstract: Use of ferri-magnetic reactive iron oxide particles to react hydrogen sulfide in water, hydrocarbon liquids or drilling mud affords quick, effective scavenging of these liquids without accumulation of particulate matter and without wasting the reactive particles. The reaction product is environmentally safe, so that it may be disposed of on a simple waste heap.A quantity of the magnetic iron oxide particles, principally a synthetic porous Fe.sub.3 O.sub.4, is suspended in the liquid. The quantity added is in excess of that required for the reaction with the hydrogen sulfide in order to speed the reaction time and provide a large margin of safety. In use, the reactive iron oxide particles contact and react the hydrogen sulfide, forming a non-magnetic particulate product of reaction. Thus, if used to scavenge a drilling mud, this contact and reaction occurs as the mud, bearing the drill cuttings, rises through the drilling formation.

Abstract: A spent solid sorbent resulting from the removal of hydrogen sulfide from a fuel gas flow is regenerated with a steam-air mixture. The mixture of steam and air may also include additional nitrogen or carbon dioxide. The gas mixture contacts the spent sorbent containing metal sulfide at a temperature above 500.degree. C. to regenerate the sulfide to metal oxide or carbonate. Various metal species including the period four transition metals and the lanthanides are suitable sorbents that may be regenerated by this method. In addition, the introduction of carbon dioxide gas permits carbonates such as those of strontium, barium and calcium to be regenerated. The steam permits regeneration of spent sorbent without formation of metal sulfate. Moreover, the regeneration will proceed with low oxygen concentrations and will occur without the increase in temperature to minimize the risk of sintering and densification of the sorbent.

Abstract: There is disclosed a process for removing sulfur compounds from a gas stream. The process involves passing the gas stream containing the sulfur compounds through a mass of porous material that has deposited upon it a metal oxide, the improvement comprises the continuous or intermittent addition of an oxidizing agent and an amine.