Abstract: Sulfur-bearing coke is desulfurized by heating it and reacting it with dilute sulfur vapor to form carbon disulfide. The reaction will proceed utilizing air-polluting sulfur components in the coke, thereby removing such components to provide a relatively non-polluting coke as a fuel.

Abstract: A low sulfur coke product is obtained in an integrated fluid coking and gasification process in which an oxygen-containing gas is introduced into the upper portion of the gasification zone and steam is introduced into the lower portion of the gasification zone. The desired degree of coke desulfurization is controlled by controlling the thickness of the gasifier coke layer on the gaseous reactor leaving solids per pass.

Abstract: Mineral matter, including pyrite, is removed from coal by treatment of the coal with aqueous alkali at a temperature of about 175.degree. to 350.degree. C, followed by acidification with strong acid.

Abstract: Pulverized coal having a sulfur content of up to 2.5% is introduced into a gasification vessel together with air preheated to a temperature above 900.degree. F. The pulverized coal and preheated air react in the gasification vessel which is operated at temperatures in excess of 1800.degree. F. with a residence time of less than three seconds therein. The reaction between the concurrent downwardly flowing coal and air produces a product comprising partially gasified char entrained in a product gas comprising methane, hydrogen, hydrogen sulfide and oxides of carbon. The partially gasified low sulfur char entrained in the product gas is withdrawn from the gasifier and conducted to a waste heat boiler to provide steam as a source of energy for power generation. Thereafter, the low sulfur char is separated from the product gas and fed to a char storage hopper which maintains the char at a temperature above 900.degree. F. and preferably above 1100.degree. F.

Abstract: A method of desulfurizing high sulfur low grade coal by immerising it in an aqueous solution of a polar compound containing nonpolar groups bonded with polar groups, thereby providing low sulfur coal.

Abstract: Coal is gasified in the presence of a small but effective amount of alkaline earth oxide, hydroxide or carbonate to yield a char fraction depleted in sulfur. Gases produced during the reaction are enriched in sulfur compounds and the alkaline earth compound remains in the char fraction as an alkaline earth oxide. The char is suitable for fuel use, as in a power plant, and during combustion of the char the alkaline earth oxide reacts with at least a portion of the sulfur oxides produced from the residual sulfur contained in the char to further lower the sulfur content of the combustion gases.

Abstract: A process for reducing the amount of free and combined sulfur, such as pyritic, organic or elemental sulfur in coal; removing of these sulfur species may be made in an acid, basic or neutral solutions; at least 50 percent and up to 90 percent of sulfur, by weight, originally present in coal may be removed.

Abstract: In the treatment of petroleum heavy oil by thermally cracking a petroleum heavy oil mixed with an alkali metal carbonate or carbonates at a cracking temperature of 450.degree. to 650.degree.C and recovering the resulting low sulfur liquid hydrocarbon and light hydrocarbon gas, (1) gasification of residual coke produced by said cracking, in the presence of the alkali metal carbonate or carbonates and an alkali metal sulfide or sulfides by-produced during the cracking, with steam alone or steam together with an oxygen-containing gas, at 550.degree. to 800.degree.C and under the atmospheric pressure to 10 atm. to produce a hydrogen- and CO.sub.2 -- rich gas, and (2) regeneration from said by-produced alkali metal sulfide or sulfides to said alkali metal carbonate or carbonates, with CO.sub.2 gas produced by said gasification and steam, are simultaneously carried out in the same reaction zone.

Abstract: This invention relates to a process for the simultaneous desulfurization and calcination of "green coke.

Abstract: The reduction of emission of sulphur dioxide from fuels containing sulphur components when such fuels are combusted. The reduction of such sulphur dioxide emissions upon the combustion of such sulphur containing fuels is accomplished by the introduction into such fuels an alkali additive which is pressure fed into such fuels at a point closely adjacent the burner structure for the combustion process thus insuring for the intimate mixture of such alkali material with the fuels to be combusted. The alkali material serves to neutralize the sulphur containing impurities which are normally caused to exit through a conventional stack exit for the exhaust gases from the burner.

Abstract: A nitrogenous ingredient is eliminated from solid fuel, for example, coal, by treating in a treating chamber, the coal with a treating gas having a predetermined temperature and composition at a temperature of 650.degree. to 1200.degree.C, the treating gas being prepared by uniformly mixing, in a conditioning chamber located upstream from the treating chamber, a predetermined amount of steam or water and hydrogen gas or a mixture gas containing at least 30% by volume of hydrogen gas together with an inert burnt gas containing at most 2% by volume of oxygen gas.

Abstract: Coke is desulfurized by calcining coke at a temperature of 1600.degree. - 2200.degree. F. in admixture with sodium carbonate, followed by direct contact with phosgene or a mixture of carbon monoxide and chlorine at a temperature of 1200.degree. - 1800.degree. F. to produce coke having sulfur contents of less than 0.5 percent.