Abstract The potassium formate (KCOOH) solution is regarded as a promising alternative for the widely used salt solution in liquid desiccant dehumidification. However, few studies have been conducted to investigate the regeneration characteristics of KCOOH solution. In the present study, it firstly measured the vapor pressure of KCOOH solution with different temperature and concentration. Then the corrosion behavior of stainless steel 316L in both KCOOH and LiCl solution was studied with electrochemical test. Finally, experiments were carried out to study and compare the regeneration performance of the two liquid desiccants. Results showed that the vapor pressure of KCOOH solution with the concentration of 64.3% to 73.3% was similar to that of LiCl solution with the concentration of 33% to 38% when the temperature was from 45 °C to 65 °C. Both the regeneration rate and mass transfer coefficient were almost the same for KCOOH solution and LiCl solution in the same experimental conditions. However, the application of KCOOH solution could reduce the investment of liquid desiccant by up to 931 USD/100 kg, and dramatically alleviate the corrosion as well. In addition, a correlation to predict the mass transfer coefficient was developed and validated with the mean absolute relative deviation of only 3.92%.

中文翻译：

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KCOOH水溶液腐蚀行为及再生性能的实验研究

摘要 甲酸钾（KCOOH）溶液被认为是液体干燥剂除湿中广泛使用的盐溶液的有前途的替代品。然而，很少有研究调查 KCOOH 溶液的再生特性。在本研究中，它首先测量了不同温度和浓度的 KCOOH 溶液的蒸气压。然后通过电化学测试研究了不锈钢316L在KCOOH和LiCl溶液中的腐蚀行为。最后，通过实验对两种液体干燥剂的再生性能进行了研究和比较。结果表明，当温度为45℃～65℃时，浓度为64.3%～73.3%的KCOOH溶液的蒸气压与浓度为33%～38%的LiCl溶液的蒸气压相似。在相同的实验条件下，KCOOH 溶液和 LiCl 溶液的再生速率和传质系数几乎相同。然而，KCOOH 溶液的应用可以减少液体干燥剂的投资高达 931 美元/100 公斤，并显着减轻腐蚀。此外，开发并验证了预测传质系数的相关性，平均绝对相对偏差仅为 3.92%。