SBIR Phase I: Electrochemical Chlorine Purification

这个小企业创新研究一期项目将开发一种新的电化学方法来净化“尾气”，也被称为排气或嗅气。氯碱工业生产的氯大约有一半是液化、储存和运输的。液化过程的尾气中含有氯（Cl2）和氧（O2）、氮（N2）、二氧化碳（CO2）和氢（H2）等杂质。第一阶段是在气体扩散或多孔流动型阴极上从不纯氯流中还原Cl2。产物HCl经阳极氧化生成化学上纯净的Cl2。不纯Cl2气流中的其他杂质，如N2、CO2，要么在阴极处不能还原，要么还原度太低而不显著。第一阶段的目标是高电流密度。操作，描绘氯中的杂质对阴极性能的影响，并尽量减少阳极寄生反应的贡献。与商业相关的好处包括：节约材料（不浪费Cl2），相对于其他技术减少能源消耗，消除废气流，产生纯Cl2。

This Small Business Innovation Research Phase I project will develop a novel electrochemical method of purification of "tail" gas, also known as vent or sniff gas. About half of the chlorine produced in the chlor-alkali industry is liquefied, stored, and shipped. The tail gas from the liquefaction process contains chlorine (Cl2) with oxygen (O2), nitrogen (N2), carbon dioxide (CO2), and hyrogen (H2) as impurities. Phase I involves reduction of Cl2 from the impure chlorine stream at a gas diffusion or porous flow-through type cathode. The product HCl is anodically oxidized to generate chemically pure Cl2. The other impurities in the impure Cl2 gas stream, e.g., N2, CO2, are either not reducible at the cathode or their reduction is too low to be significant. The objective of Phase I is high current density.operation, delineating the effects of impurities in the chlorine on cathode performance, and minimizing the contribution of parasitic reactions at the anode.Commercially relevant benefits include: material conservation (Cl2 is not wasted), reduction in energy consumption relative to other technologies, elimination of waste gas streams, and generation of pure Cl2.