Abstract: The reduction of the gas stream containing sulfur dioxide to elemental sulfur is carried out by reacting a reducing gas, such as natural gas, methanol or a mixture of hydrogen and carbon monoxide, with recycled sulfur and recycled tail gas to produce a stream containing hydrogen sulfide that may be reacted with the gas stream that contains sulfur dioxide. Gas streams with a molar concentration of sulfur dioxide from 1 to 100% may be processed to achieve nearly 100% sulfur recovery efficiency.

Abstract: A feed gas stream containing hydrogen sulphide is subjected in a furnace 6 to reactions in which part of the hydrogen sulphide is burned to form sulphur dioxide, and is which the sulphur dioxide reacts with residual hydrogen sulphide to form sulphur vapor. The sulphur vapor is condensed from the gas stream exiting the furnace 6 in a sulphur condenser 16. Residual sulphur dioxide is reduced back to hydrogen sulphide by hydrogen in a reactor 22. Water vapor is removed from the reduced gas in a quench tower 28 to form a water vapor-depleted gas stream. One part of the water vapor-depleted gas stream is sent to an adsorber vessel 30 in which hydrogen sulphide is absorbed in an absorbent. The resulting hydrogen sulphide-depleted gas stream is vented from the vessel 30 as a purge stream. Another part of the water vapor-depleted gas stream and a hydrogen sulphide-rich gas formed by desorbing hydrogen sulphide from the absorbent in a vessel 38 are returned as recycle streams to the furnace 6.

Abstract: A process is provided for removing sulfur compounds, such as carbonyl sulfide, carbon disulfide, mercaptans and hydrogen sulfide out of a gas, such as methane, carbon dioxide, carbon monoxide, nitrogen and methane, by saturating the sulfur compound contaminated gas with steam; hydrolyzing any carbonyl sulfide, carbon disulfide and mercaptans in the gas stream into hydrogen sulfide by contacting the steam and sulfur compound contaminated gas with a catalyst containing an inorganic support uniformly impregnated with a mixture of at least one oxide selected from Group VI transition metals and at least two oxides selected from Groups I, II, VI and VIII transition metals at a temperature of about 20.degree. C. to about 150.degree. C.; oxidizing the hydrogen sulfide in the gas exiting the previous hydrolysis step by contacting the hydrogen sulfide containing gas together with at least a stoichiometric quantity of air and/or oxygen with the catalyst at a temperature of about 15.degree. C. to about 50.degree. C.

Abstract: A process for converting carbon disulfide (CS.sub.2) to hydrogen sulfide (H.sub.2 S) in mixtures of H.sub.2 S and CS.sub.2 is provided. The H.sub.2 S/CS.sub.2 mixture is combined with water to form a hydrolysis feed mixture. The hydrolysis feed mixture is passed through a hydrolysis reactor containing e.g., an alumina-based catalyst, wherein a substantial portion of the CS.sub.2 is converted to additional H.sub.2 S. A vapor product comprising H.sub.2 S, CO.sub.2, unreacted H.sub.2 O, unconverted CS.sub.2 and sulfur is formed by the hydrolysis reaction. The vapor product is cooled to form a H.sub.2 S/CO.sub.2 vapor phase and a sour water condensate phase. The H.sub.2 S/CO.sub.2 vapor phase is separated from the sour water condensate phase and subsequently recovered. The sour water condensate phase, which contains small amounts of solid sulfur particles, is optionally then combined with additional CS.sub.2 and decanted to form a sulfur-free sour water layer and a CS.sub.2 layer containing dissolved sulfur.

Abstract: A process for removing sulfur from sulfide-bearing ores by reacting water vapor with the sulfide-bearing ore forming hydrogen sulfide while simultaneously regenerating water vapor by reacting the hydrogen sulfide with lime. Advantageously, the process occurs in the absence of a net consumption or production of gaseous species so that the process can be carried out in a closed system with respect to the gaseous species. Sulfide-bearing ores which can be treated using the process of this invention include sulfide-bearing ores of molybdenum, zinc, iron, mercury, and copper. Advantageously, the molybdenum oxide so produced from the sulfide-bearing ore of molybdenum can be reacted further with lime and water producing calcium molybdate and hydrogen. The chalcopyrite form of the sulfide-bearing ore of copper produces bornite and magnetite.

Abstract: Alkali metal sulfides are regenerated from alkali metal hydrosulfides which are produced as a result of the hydroconversion of heavy carbonaceous feeds. The regeneration is effected by treating the spent solids from a hydroconversion reactor, said solids containing an alkali metal hydrosulfide, with water and carbon dioxide at a temperature and pressure sufficient to convert about 50% of the alkali metal hydrosulfide to an alkali metal carbonate, and heating a mixture of said alkali metal carbonate and unreacted alkali metal hydrosulfide with a quantity of coke to an elevated temperature sufficient to cause reaction of the hydrosulfide with the carbonate whereby an alkali metal sulfide is formed.

Abstract: Alkali metal sulfides are regenerated from alkali metal hydrosulfides which are produced as a result of the hydroconversion of heavy carbonaceous feeds. The regeneration is effected by contacting the alkali metal hydrosulfide with a metal oxide at elevated temperatures.

Abstract: A reducing gas stream containing hydrogen, carbon monoxide and water, as steam, is passed through a molten sulfur to vaporize sulfur. The gas stream containing the vaporized sulfur is passed through a catalytic conversion zone where at a controlled temperature of from about 500.degree. to about 800.degree. F sulfur is converted to hydrogen sulfide. The introduced steam optionally coupled with a water quench following hydrogenation of sulfur serves to suppress carbonyl sulfide and carbon disulfide formation.

Abstract: The invention is a method for preparing hydrogen sulfide by reacting a gas mixture containing carbon monoxide with sulfur to provide a gas mixture containing carbonyl sulfide and reacting the gas mixture containing carbonyl sulfide with water in the vapor phase to provide a gas mixture containing hydrogen sulfide. The process is preferrably operated continuously. The water can be present in the step in which the carbon monoxide is reacted with the sulfur.