State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
Environ Sci Technol. 2013 Feb 5;47(3):1598-605. doi: 10.1021/es304147q. Epub 2013 Jan 25.
A binary system consisting of polyethylene glycol (PEG, proton donor)/PEG-functionalized base with suitable basicity was developed for efficient gas desulfurization (GDS) and can be regarded as an alternative approach to circumvent the energy penalty problem in the GDS process. High capacity for SO(2) capture up to 4.88 mol of SO(2)/mol of base was achieved even under low partial pressure of SO(2). Furthermore, SO(2) desorption runs smoothly under mild conditions (N(2), 25 °C) and no significant drop in SO(2) absorption was observed after five-successive absorption-desorption cycles. On the other hand, the absorbed SO(2) by PEG(150)MeIm/PEG(150), being considered as the activated form of SO(2), can be directly transformed into value-added chemicals under mild conditions, thus eliminating the energy penalty for SO(2) desorption and simultaneously realizing recycle of the absorbents. Thus, this SO(2) capture and utilization (SCU) process offers an alternative way for GDS and potentially enables the SO(2) conversion from flue gas to useful chemicals as a value-added process.
一个由聚乙二醇（PEG，质子供体）/PEG 功能化碱基组成的二元体系被开发用于有效的气体脱硫（GDS），并可以被视为一种替代方法来规避 GDS 过程中的能量惩罚问题。即使在 SO2 分压较低的情况下，也实现了高达 4.88 mol 的 SO2/mol 碱基的高容量 SO2 捕获。此外，SO2 解吸在温和的条件下（N2，25°C）下顺利进行，并且在五个连续的吸收-解吸循环后，SO2 吸收没有明显下降。另一方面，被认为是 SO2 活性形式的 PEG(150)MeIm/PEG(150) 吸收的 SO2 可以在温和的条件下直接转化为有价值的化学品，从而消除了 SO2 解吸的能量惩罚，同时实现了吸收剂的循环利用。因此，这种 SO2 捕集和利用（SCU）过程为 GDS 提供了一种替代方法，并有可能将烟道气中的 SO2 转化为有价值的化学品，作为一种增值过程。
