| 摘要 |
<p>The invention relates to a process for producing a purified gas stream from a feed gas stream comprising contaminants, the process comprising the following steps:
(a) removing contaminants from the feed gas stream to obtain the purified gas stream and a sour gas stream comprising hydrogen sulphide and mercaptans;
(b) separating the sour gas stream comprising hydrogen sulphide and mercaptans into a gas stream enriched in hydrogen sulphide and a residual gas stream comprising mercaptans;
(c) converting hydrogen sulphide in the gas stream enriched in hydrogen sulphide to elemental sulphur in a Claus unit, thereby obtaining a first off-gas stream comprising sulphur dioxide;
(d) converting sulphur dioxide in the first off-gas stream comprising sulphur dioxide to hydrogen sulphide in a Claus off-gas treating reactor to obtain a second off-gas stream comprising hydrogen sulphide;
(e) converting mercaptans from the residual gas stream comprising mercaptans to hydrogen sulphide in a mercaptans conversion reactor to obtain a residual gas stream comprising hydrogen sulphide,
wherein step (e) comprises contacting the residual gas stream comprising mercaptans with a hydrogenation catalyst comprising nickel and molybdenum or nickel and tungsten supported on a carrier, in the presence of hydrogen, at a temperature in the range of 260 to 350 °C.</p> |
