PROCESS FOR THE RECOVERY OF SULFUR FROM SULFUR CONTAINING GASES WITH A HIGH EFFICIENCY

摘要

The invention is directed to a process for the recovery of sulfur from sulfur containing gases with a high sulfur recovery efficiency of at least 99.8 %. According to the process of the invention a tail gas of a Claus-type installation with a sulfur recovery efficiency of at least 97 % and having a free oxygen concentration of 0.1-0.7 vol.% is hydrogenated, and subsequently H2S is removed from the resulting gas stream, e.g. by selectively oxidizing it at a temperature between the water dewpoint temperature and 280 DEG C, and cooling it to a temperature of 80-115 DEG C. The process of the invention enables total sulfur recovery efficiencies of at least 99.8 %.