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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1536 Klaus-Dirk Henning<br />

Figure 22.1.20. Adsorption wheel for solvent recovery in packaging printing (After reference 33).<br />

(CS 2) and hydrogen sulphide (H 2S) have to be cleaned. Typical waste gas volumes and concentration<br />

<strong>of</strong> CS 2 and H 2S are given in Table 22.1.11.<br />

Different cleaning/recovery processes are available for the removal <strong>of</strong> each <strong>of</strong> the two<br />

sulfur containing compounds: 2,17,34,35<br />

Hydrogen sulfide<br />

• Absorption <strong>of</strong> H 2S in a NaOH-scrubber<br />

• Catalytic oxidation <strong>of</strong> H 2S to elemental sulphur on iodine impregnated activated<br />

carbon (Sulfosorbon-process)<br />

2H 2S + O 2 → 2 S + 2 H 2O<br />

The sulphur is adsorbed at the internal surface at the carbon-catalyst.<br />

Table 22.1.11. Waste gas in the viscose industry (After reference 35)<br />

Product<br />

Spec. waste gas<br />

volume, m 3 /t<br />

Concentration (mg/m 3 )<br />

H2S CS2 Rayon 400,000 - 700,000 60 -130 300 - 800<br />

Staple fibre 50,000 - 90,000 700 -1800 2300 - 4000<br />

Viscose fibre 100,000 -150,000 280 - 400 1000 - 3000

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