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首页> 外文会议>International Symposium on Energy and Electrochemical Processes for a Cleaner Environment, 2001, San Francisco, CA >CHLORINE RECYCLE IN AN ELECTROCHEMICAL MEMBRANE CELL
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CHLORINE RECYCLE IN AN ELECTROCHEMICAL MEMBRANE CELL

机译：电化学膜细胞中的氯循环

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摘要

A molten salt-based electrochemical membrane technique for the recovery of chlorine (Cl_2) from gaseous hydrogen chloride (HCl) has been tested. Hydrogen chloride is reduced at the cathode to form hydrogen and chloride ions, which migrate across a membrane to the anode where they are oxidized to produce a pure chlorine stream At current densities up to about 400 mA/cm~2, stoichiometric conversion of HCl into chlorine and hydrogen was observed. The applied current densities were limited only by the capacity of the potentiostat; the applied voltages, when corrected for ohmic losses, reach levels of about 3V and do not appear to increase with current. This suggests that the concentration and activation overpotentials are small and that substantially higher current densities, in excess of 1 A/cm~2, are indeed achievable at modest voltages. Chlorine product purity, as measured by FT-IR analysis, is exceptional; no other species could be detected. Further, it is quite possible that wet, contaminated HCl process gas streams can be treated with this type of cell without compromising product purity. The cell was able to withstand temperature, flow, and current cycling with no apparent loss in performance. This has very positive implications for field use.
机译：已经测试了用于从气态氯化氢（HCl）中回收氯（Cl_2）的基于熔融盐的电化学膜技术。氯化氢在阴极还原，形成氢和氯离子，它们跨膜迁移到阳极，在阳极被氧化，生成纯氯流。电流密度高达约400 mA / cm〜2，HCl化学计量转换为观察到氯和氢。施加的电流密度仅受恒电位仪容量的限制；校正了欧姆损耗后，施加的电压将达到约3V，并且不会随电流而增加。这表明浓度和活化超电势很小，并且在适度的电压下确实可以实现超过1 A / cm〜2的更高的电流密度。通过FT-IR分析测得的氯产品纯度极高；没有其他物种可以被检测到。此外，很可能可以用这种类型的电解池处理潮湿的，受污染的HCl工艺气流，而不会影响产品的纯度。电池能够承受温度，流量和电流循环，而性能没有明显损失。这对现场使用具有非常积极的意义。

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