Abstract
The characteristic features of methanethiol synthesis from dimethyl sulfide and H2S in the presence of Al2O3 at atmospheric pressure and T = 320–500°C have been studied. It has been shown that the yield of methanethiol increases with an increase in the temperature, the H2S-to-dimethyl sulfide ratio, and the contact time, attaining equilibrium values. The methanethiol formation rate is proportional to the dimethyl sulfide partial pressure raised to a power of 0.4 and the H2S partial pressure raised to a power of 0.8. An increase in the specific surface area and the volume of transport pores and a decrease in the particle sizes of Al2O3 facilitate the augmentation of the catalyst activity in methanethiol formation. At T ∼ 400°C, a low H2S concentration, and a long contact time, the side reaction of dimethyl sulfide cracking occurs to result in the release of methane and the deposition of sulfur-containing and carbonaceous compounds on the surface, which lower the activity of alumina. The deactivated catalyst can be regenerated by oxidation.
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Original Russian Text © A.V. Mashkina, 2009, published in Neftekhimiya, 2009, Vol. 49, No. 5, pp. 441–447.
S.N. Koshelev and V.N. Yakovleva took part in the work.
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Mashkina, A.V. The features of the catalytic synthesis of methanethiol from dimethyl sulfide. Pet. Chem. 49, 420–426 (2009). https://doi.org/10.1134/S0965544109050168
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DOI: https://doi.org/10.1134/S0965544109050168