Hydrogen sulfide thermal decomposition

Hydrogen sulfide conversions of up to 62 mL min i were obtained at 900 °C with a 40% H2S stream flowing at 200 mL mimL This corresponded to an equivalent current density of 710 mA cm and close to 550% removal beyond that expected from thermodynamic hydrogen sulfide thermal decomposition at this... 

Raymont MED (1974) Hydrogen sulfide thermal decomposition. Ph.D. Thesis, University of Calgary, Calgary, AB, Canada... 

Thiepane (35) has been purified by distillation at normal pressure (b.p. 170-174 °C) and may therefore be considered a thermally stable compound. At higher temperatures (400 °C) and in the presence of an aluminum silicate catalyst, however, thermal decomposition does occur to give hydrogen sulfide as one product (72HC(26)573). 

Distillation is not a desulfurization process insofar as the sulfur in the feedstock is not completely (if at all) eliminated. Maximum permissible temperatures to which the feedstock is heated are on the order of 350°C (660°F) that minimizes the tendency for thermal decomposition of the components of the feedstock to occur. Cracking distillation, in which the feedstock is deliberately heated to temperatures in excess of 350°C (660°F) is the exception. Sulfur will (in most cases) be eliminated as hydrogen sulfide (H2 S) through the agency of inter- and intramolecular hydrogen transfer. 

Work was carried out in this laboratory to reproduce these reactions7. Attempts to prepare Mo02S did not yield a simple molybdenum oxysulfide or a molybdenum sulfide, but a mixture of unidentifiable products. The reaction of MoS2 with water vapor yielded neither hydrogen nor hydrogen sulfide. The thermal decomposition of... 

Hydrogen sulfide can fracture into hydrogen and sulfur merely by thermal decomposition, but the equilibrium H2 concentrations are at best those shown in Table I. 

Methyl />-tolyl sulfone has been prepared by oxidation of methyl 7>-tolyl sulfide with hydrogen peroxide 4 r or ruthenium tetroxide,6 by alkylation of sodium -toluenesullinate with methyl iodide 7,8 or with methyl potassium sulfate,9 by decarboxylation of -tolylsulfonylacetic acid,7 by thermal decomposition of tetramethylammonium -toluenesulfinate,10 by reaction of cw-bis-(%tolylsulfonvl)-ethene with sodium hydroxide (low yield),11 by the reaction of methanesulfonyl chloride with toluene in the presence of aluminum chloride (mixture of isomers),12 by... 

Fluid-solid reactions include thermal decomposition of minerals, roasting (oxidation) of sulfide ores, reduction of metal oxides with hydrogen, nitridation of metals, and carburization of metals. Each t3 e of reaction will be discussed finm the thermodynamic point of view. Then reaction kinetics for all of the various rate determining steps in fluid-sohd reactions will be discussed for two general models shrinking core and shrinking particle. 

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