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Toluene absorption performance and influence factors for soluble ionic liquids

Chinese Journal of Environmental Engineering, ISSN: 1673-9108, Vol: 11, Issue: 3, Page: 1683-1690
2017
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Article Description

A series of absorption experiments was conducted to analyze the gaseous toluene absorption capacity of three water-soluble absorbents: 1-dodecyl-3-methylimidazolium chloride (DDMIM Cl), DDMIM nitrate (DDMIM NO), and DDMIM dicyanamide (DDMIM DCA). The influence of such factors as the toluene concentration, absorbent content, gas flow rate, and mineral salt presence on the performances of these absorbents was assessed. The heating distillation method was used to investigate the possibility of toluene recovery and reuse of the absorbent solution. The experimental results showed that each ionic liquid has a different toluene absorption efficiency. At a toluene concentration of 5%, DDMIM DCA outperformed the other absorbents, with an initial absorption rate of 98% and a saturated absorption capacity of 53.39 mg·L. In comparison, DDMIM Cl and DDMIM NO had initial toluene absorption rates of approximately 92% and saturated absorption capacities of 33.60 and 37.01 mg·L, respectively. The saturated absorption capacity was positively correlated with the absorbent concentration and toluene concentration of the inlet gas but negatively correlated with the inlet gas flow rate and mineral salt content. The mass transfer coefficient was positively correlated with the toluene concentration, inlet gas flow rate, and mineral salt content, but negatively correlated with the absorbent concentration. The recovery efficiency of toluene from the absorbent solution using the heating distillation method reached from 85% to 90%, and the saturated absorption capacity remained fairly consistent during regeneration. In conclusion, ionic liquids show potential for recovering toluene from waste gas.

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