A shock tube study of pyrolysis of tetrahydrothiophene at elevated temperatures

Abstract

SUMMARYA single pulse shock tube has been used to study the pyrolysis of a hydrogenated sulphur compound, tetrahydrothiophene over the temperature range 1686-1885 K and pressures between 2.4 and 3.5 bars. Product yield and composition was determined using capillary column gas-chromatography with flame ionization detection and flame photometric sulphur selective detection. The principal hydrocarbon products at all temperatures were C 2 H 4 and C 2 H 2 . Other hydrocarbon reaction products were CH 4 , C 2 H 6 , C 3 H 4 , C 3 H 6 , C 4 H 3 , C 4 H 6 , C 4 H 10 , C 4 H 4 , C 6 H 6 , C 4 H 2 and some traces of C 5 and C 6 H 5 species. The sulphur compounds identified were hydrogen sulphide, carbon disulphide, thiophene and traces of ethyl mercapton. The pyrolysis experiments indicated that at lower temperatures the hydrogenated thiophene molecule reacts in two unimolecular channels to form C 2 H 4 +(CH 2 )2-S in the major faster channel which may be the route for other products. However, a second lower route may be the formation of C 3 H 6 +CH 2 S. The rate constant obtained for tetrahydrothiophene pyrolysis calculated for this study was k dis(C4H8S) =1.26 Â 10 13 exp (316.9 kJ mol À1 ) s À1 .

Metal Sulfide Nanoparticles: Precursor Chemistry

“…These two compounds have been used in wet chemical methods and in methods that involve pyrolysis for the production of metal sulfide NPs. The main sulfur decomposition products of tetrahydrothiophene are CS 2 , H 2 S, and thiophene [135] . On the other hand, the main sulfur decomposition products of thiophene are CS 2 , H 2 S, and elemental sulfur [136] .…”

Theoretical Study of Decomposition of Thiophenic Compounds in Accidental and Spontaneous Fires of Coal

“…Various studiesPrevious studies have suggested the emergence of H 2 S as a major gaseous product during pyrolysis of thiophene above 1000 K [10]. It follows that, an atomic-base understanding of the decomposition of thiophenic compounds would be instrumental in the effort to reduce emission of sulfur species from accidental fires of coal.…”

Theoretical and Experimental Studies on the Thermal Cracking of Tetrahydrothiophene

“…The conversions of dibenzothiophene were also researched in the closed pyrolysis system by Dartiguelongue et al 9 recently, and they suggested the thermal-cracking mechanisms including the C-S bond cleavage leading to the degradation of the molecular skeleton and oligomerization of two dibenzothiophenes or dibenzothiophene with other aromatics produced in the process. Memon et al 10 reported the pyrolysis of tetrahydrothiophene in a shock tube in 2004 and found that hydrogen sulfide, carbon disulfide, thiophene, and ethyl mercaptan were the sulfurcontaining compounds produced. Clark et al 11 studied the hydrolysis and thermolysis of tetrahydrothiophene in relation to steam-stimulation processes and found that hydrogen sulfide is the main sulfur-containing compound.…”