SBIR Phase I: Electrochemical Chlorine Purification

这个小企业创新研究第一阶段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。液化过程的尾气含有氯(Cl2)和氧(O2)、氮(N2)、二氧化碳(CO2)和氢气(H2)作为杂质。第一阶段涉及在气体扩散或多孔型流通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纯Cl2。不纯Cl2气流中的其他杂质，如氮气、二氧化碳，要么在阴极上不能还原，要么它们的还原程度太低，不明显。第一阶段的目标是高电流密度运行，描述氯中的杂质对阴极性能的影响，并最大限度地减少阳极上寄生反应的影响。商业上相关的好处包括：材料节约(不浪费Cl2)，相对于其他技术降低能耗，消除废气，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.