Process for sulfur removal from refinery off gas

A process for removal of organic sulfur compounds from multiple refinery off gas streams containing at least olefins and sulfur compounds including H2S and organic sulfur compounds, wherein a first off gas feed stream contains a high concentration of olefins and a second off gas feed stream contains a low concentration of olefins, the process comprising:

• a) feeding the first feed stream to an amine absorber to remove at least part of the H2S to produce a first H2S depleted stream;
• b) feeding the second feed stream to an amine absorber to remove at least part of the H2S to produce a second H2S depleted stream;
• c) splitting the first H2S depleted stream into a first split stream and a second split stream;
• d) feeding the first split stream into a catalytic reactor at a temperature of between 340° C. and 450° C. to convert a majority of the organic sulfur compounds to H2S at the pressure employed and removing a hot first organic sulfur depleted stream from the catalytic reactor;
• e) combining the second split stream and second H2S depleted stream are mixed in quantities such that the resulting combined stream is fed into a hydrotreater and maintains the temperature of the hydrotreater to between about 340° C. and 450° C. at the pressure employed and converting the organic sulfur compounds into H2S;
• f) removing a second organic sulfur depleted stream from the hydrotreater;
• g) combining the first organic sulfur depleted stream and the second organic sulfur depleted stream to form a combined organic sulfur depleted stream;
• h) cooling the combined organic sulfur depleted stream;
• and
• i) feeding the cooled combined organic sulfur depleted stream to an amine sulfur removal system to remove the H2S and produce a product gas stream.