SBIR Phase II: Electrochemical Chlorine Purification

该小型企业创新研究第二阶段项目将进一步开发电化学氯净化工艺，并在氯碱厂使用0.5平方米的电解槽进行试点试验。在第一阶段，密度高达0.5 A/cm 2（在室温下），证明了这个过程中，在最高电流密度的电位小于300 mV。 一个中试规模的MP-细胞与100平方厘米的电极面积被成功地证明，净化氯的流通电极模式，使用阴离子交换膜。出口处的氯纯度为100%。对氯气和氯离子进行完全的质量平衡。第二阶段计划的目标包括：（a）研究和了解浓盐酸中氯还原的机理，（B）研究浓盐酸中氯氧化和氯还原过程的催化作用，（c）建造一个0.5平方米的中试电解槽，以及（d）使用中试电解槽在氯碱厂进行现场试验。在第二阶段结束时，将完成详细的经济分析，以便能够进行商业化努力。 世界氯碱工业的生产能力预计将从目前的4 210万吨增加到2002年的4 900万公吨。到2007年，将处理的尾气总额为5.62亿美元，用于替代第三阶段液化的技术。第二阶段液化的市场约为17亿美元。联合S.到2007年，低成本、高能效技术如电化学净化的市场规模约为1.6亿美元。

This Small Business Innovative Research Phase II project will further the development of the electrochemical chlorine purification process and conduct a pilot trial with a 0.5 square meter cell at a chlor-alkali plant. During the Phase I phase, densities as high as 0.5 A/cm2 (at room temperature) were demonstrated for this process, with a potential of less than 300 mV at the highest current density. A pilot scale MP-cell with 100 cm2-electrode area was successfully demonstrated to purify chlorine in the flow through electrode mode using anion exchange membranes. Chlorine purity at the outlet was 100%. A complete mass balance was carried out for the chlorine gas and the chloride ion. The objectives of the Phase II program include (a) study and understanding of the mechanism of chlorine reduction in concentrated hydrochloric acid, (b) investigation of catalysis of both the chloride oxidation and chlorine reduction processes in concentrated HCl, (c) building a 0.5 square meter pilot cell, and (d) conducting field trials in a chlor-alkali plant with the pilot cell. At the end of Phase II, a detailed economic analysis would have been completed to enable commercialization efforts. The world chlor-alkali industry is projected to grow from the current production capacity of 42.1 million tons to 49 million metric tons in the year 2002. The total amount of tail gas to be processed is 562 million dollars through the year 2007 for a technology that replaces third stage liquefaction. The market for the second stage liquefaction is approximately 1.7 billion dollars. The U. S. market size for a low cost, energy efficient technology such as electrochemical purification is approximately 160 million dollars through 2007.