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Enhancement of CO₂ Desorption from a Novel Absorbent (Dimethyl Carbonate) by Using a PDMS/TiO₂ Pervaporation Membrane
- Ataeivarjovi, Ebrahim, Tang, Zhigang, Chen, Jian, Zhao, Zhijun, Dong, Guo
- ACS sustainable chemistry & engineering 2019 v.7 no.14 pp. 12125-12137
- absorbents, absorption, carbon, carbon dioxide, carbonates, climate change, desorption, emissions, energy, models, nanocomposites, nanoparticles, operating costs, pervaporation, polydimethylsiloxane, solvents, temperature, titanium dioxide
- Currently, there is strong interest in carbon capture and absorption as a means of reducing carbon dioxide emissions and combating climate change. Unfortunately, the current and traditional methods to achieve such goals are not economical, because they require a huge absorption–desorption plant with high investment and operating costs and high recycle rates of chemical absorbers. In this paper, we propose a novel CO₂ capture method combining dimethyl carbonate as a physical solvent and polydimethylsiloxane (PDMS)/TiO₂ nanocomposite as a desorption membrane. The effects of TiO₂ concentration, feed temperature, and permeate pressure on the pervaporation process for CO₂ capture were studied. Results showed that the addition of TiO₂ nanoparticles (up to 5 wt %) resulted in 3.61 kg/m²·h flux and 44.68 selectivity of the membrane. The presence of TiO₂ nanoparticles in the PDMS membrane not only increased the performance of membrane’s but also reduced (about 72%) energy consumption. To corroborate our experimental findings, a simple simulation was conducted by Gaussian 09. The modeling results demonstrated that the incorporation of TiO₂ nanoparticles to the PDMS led to favorable absorption of CO₂ compared with the composite one. These results indicate a novel and promising method to capture CO₂ effectively and economically for industrial purposes.