Improved solvation routes for the Bunsen reaction in the sulphur iodine thermochemical cycle: Part III–Bunsen reaction in molecular solvents
Improved solvation routes for the Bunsen reaction in the sulphur iodine thermochemical cycle: Part III–Bunsen reaction in molecular solvents
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DOI：
10.1016/j.ijhydene.2012.11.099
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发表时间：
2013-02
影响因子：
7.2
通讯作者：
M. L. Taylor;R. Elder;R. Allen
中科院分区：
文献类型：
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作者：
M. L. Taylor;R. Elder;R. Allen
在溶剂中进行本生反应有可能提高 SI 循环效率并降低运营成本。分析产生的溶剂-酸混合物很复杂，因为当 SO2 与水接触时会形成额外的酸。磷酸三正丁酯（TBP）适用于HI萃取；然而，它容易发生酸催化脱烷基化，导致溶剂分解并产生丁基碘。由于 Cyanex®923 对 HI 的高亲和力，Cyanex®923 在本生反应中优于 TBP。 HI、SO2 和 Cyanex®923 中的磷酰基之间形成强橙色络合物，可实现良好的产物分离，但严重阻碍了 HI 的回收。用水洗涤有机相主要除去H 2 SO 4 。然后可以通过热或第二次洗涤步骤来回收 HI。 Cyanex®923 中的本生反应仍远未优化，但应优先考虑开发更复杂的分析方法，以充分表征系统。
Operating the Bunsen reaction in a solvent has the potential to increase SI cycle efficiency and decrease operating costs. Analysing the solvent–acid mixtures produced is complicated as additional acid is formed when SO2comes into contact with water. Tri-n-butyl phosphate (TBP) is suitable for HI extraction; however, it is susceptible to acid catalysed dealkylation, resulting in solvent decomposition and the production of butyl iodide. Cyanex®923 is found to be superior to TBP in the Bunsen reaction due to its high affinity for HI. Strong orange complexes between HI, SO2and the phosphoryl group in Cyanex®923 are formed, giving good product separation, however severely hampering HI recovery. Washing the organic phase with water resulted primarily in the removal of H2SO4. HI could then be recovered either thermally or with a second wash step. The Bunsen reaction in Cyanex®923 remains far from optimised, however priority should be given to developing a more sophisticated analytical method in order to fully characterise the system.