Method for cleaning viscose production off-gases and catalysts for use in the method
US11198093B2 · kind B2 · utility
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5Claims
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Key dates
| Filing date | Sep 11, 2017 |
| Grant date | Dec 14, 2021 |
| Priority date | — |
| Expiry date | Aug 21, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.