HETEROPOLY ACID AS NEW LIQUID REDOX ABSORBENT FOR LOW SULFUR CONTAINING GAS SWEETENING

概要

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Using as absorbent the aqueous solution of heteropoly compound, namely H3PW10Mo2O40, a new approach to low sulfur containing gas desulfurization and sulfur recovery was developed. The dependence of the desulfurization efficiency on factors including the absorbent concentration, absorption temperature and the feed gas H2S concentration were experimentally investigated, whereby the favourable operation conditions were recommended. For the gas stream with H2S concentration below 1000mg/m3, flowing at a rate of 0.368L/min, the favourable concentration of 200mL of H3PW10Mo2O40 is ca. 5×10-3mol/L. Within the temperature range of beyond 30°C as investigated, the increase of the absorption temperature tends to decrease the desulfunzation efficiency of H3PW10Mo2O40 solution. However, within the temperature range of below 30°C, the reverse effect can be found. Hence, ambient temperature of around 30°C is favourable for desulfurization. The desulfurization efficiency of H3PW10Mo2O40 solution decreases with the increase of H2S concentration in the feed gas stream, which can be found remarkably when the absorption time exceeds 20min. Some additives having positive effect on the desulfurization performance of H3PW10Mo2O40 solution were found, with the effect decreasing in the order CuS>NaCl>NH4VO3 at low dosage.
日本マクロエンジニアリング学会の論文