Process for reducing the total sulphur content of a gas stream

摘要

The invention relates to a process for reducing the total sulphur content of a gas stream comprising hydrogen sulphide and sulphur dioxide, which process comprises:
(a) contacting the gas stream comprising hydrogen sulphide and sulphur dioxide first with a hydrogenation catalyst and then with a hydrolysis catalyst, in the presence of a reducing gas and under hydrogenation conditions, to obtain a hydrogenated gas stream enriched in hydrogen sulphide; and
(b) removing hydrogen sulphide from the gaseous stream enriched in hydrogen sulphide, wherein the hydrogenation catalyst comprises nickel and molybdenum on an alumina carrier and the hydrolysis catalyst is a catalyst capable of catalysing hydrolysis of carbonyl sulphide to form hydrogen sulphide.