Process for the removal of sulphur compounds from off-gases.

摘要

Removal of sulphur compounds from the off-gas of a sulphur recovery unit of the Claus type, in which this off-gas is mixed with an H2S-rich gas to form a gas mixture having a higher H2S to SO2 molar ratio than the off-gas, which gas mixture is passed at a temperature below 300 DEG C over a Claus catalyst and a second off-gas is separated from the catalyst, said second off-gas is subsequently passed over a regenerable solid metal oxide absorbent to absorb H2S, spent metal oxide absorbent is regenerated, thereby producing a gas rich in sulphur compounds which is introduced into a sulphur recovery unit of the Claus type.