Method for cleaning viscose production off-gases and catalysts for use in the method
AssigneeHaldor TopsøE A/S
InventorsNiklas Bengt Jakobsson, Peter Bo Olsen, Per Aggerholm Sørensen, Anders Theilgaard Madsen
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Abstract
A method for cleaning an off-gas from viscose production, essentially containing H2S and CS2, comprises passing the gas through a catalytic reactor containing a direct oxidation type catalyst, such as V2O5 on silica, to convert H2S in the gas to elemental sulfur, SO2 or mixtures thereof, either via the oxygen present in the gas or via oxygen added to the gas stream. Elemental sulfur and SO2 are removed from the effluent gas from the catalytic reactor, and the unconverted CS2 is recycled to the viscose production process.
Claims5
A method for cleaning off-gases from viscose production, said off-gases containing air and sulfur components, including H2S and CS2, comprising:
- passing the off-gas through a catalytic reactor containing a direct oxidation type catalyst to convert H2S in the off-gas to elemental sulfur and SO2, either via oxygen present in the gas or via oxygen added to the gas stream,
- removing elemental sulfur and SO2 from the effluent gas from the catalytic reactor, and
- recycling an amount of unconverted CS2 to the viscose production process,
- wherein the elemental sulfur is removed in a condenser and the SO2 is removed in a caustic scrubber.
Dependencies are inferred from the claim text.