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Chemical Engineering MagazineChementator Briefs
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Chementator Briefs

By Gerald Ondrey |

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Sulfur control Preferential Oxidation Catalysis — a new catalytic solution from Haldor Topsoe A/S (Lyngby, Denmark: www.topsoe.com) — has been industrially proven to effectively remove undesired hydrogen sulfide in lean off-gases from viscose production at a significantly lower cost than traditional scrubbers. The new technology has been demonstrated to selectively treat different sulfur compounds in order to more efficiently remove H2S from emissions, while retaining the valuable carbon disulfide that is reused in the production. In addition, unlike traditional scrubbing, Preferential Oxidation Catalysis does not consume costly sodium hydroxide or produce wastewater, which is troublesome to dispose of. The technology was developed and tested in the laboratory and at a small-scale industrial plant in collaboration with Birla Cellulose of the Aditya Birla Group, a leading viscose manufacturer. The next step is building a large-scale demonstration plant in China together with Zhongtai Group in connection with a viscose plant in the Xinjiang province. The demonstration plant will be commissioned later in 2019.
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