Regeneration behavior of tin oxide sorbent for warm syngas desulfurization

摘要

cqvip:The steam regeneration and SO2 regeneration of tin oxide for warm syngas desulfurization is studied in the temperature range of 400–600 °C. In the steam regeneration, reversible removal of H_2S achieved. Regenerated H_2S concentration increased with the increasing regeneration temperature. SnO_2 sorbent can achieve a complete regeneration by steam at 500 and 600 °C. In the SO_2 regeneration, elemental sulfur was produced by the reaction of Sn S and SO_2. Raising the regeneration temperature(500–600 °C) or SO_2 concentration(1.5–10 vol%) improved the regeneration rate. Under SO_2 regeneration at 500 °C, SnS_2 formed in the sorbent due to the interconversion of tin sulfides. Under steam regeneration or SO_2 regeneration, the cyclic breakthrough sulfur capacity of SnO_2 sorbent decreased because of the sintering caused by low melting component Sn S. A two-stage regeneration process was applied to recover the elemental sulfur which achieved a complete regeneration.