Electroeluent generator is a key component of the new generation of ion chromatography system and one of the two major components of reagent-free ion chromatography system. The electro-eluent generator can transform pure water into potassium hydroxide solution which is positively related to applied current on line. It can fundamentally eliminate many shortcomings of manual preparation of eluent, such as time-consuming, impurities, human error and so on. At the same time, the automation level of the system is significantly improved.

　　根据结构不同，淋洗液发生器大致上可以分为两种类型：单膜型和双膜型。单膜型是指只用一种类型的离子交换膜将高压淋洗液通道和低压储备液室隔离开来，其中一个电极直接放置于高压淋洗液通道内。发生器工作时，高压淋洗液通道内产生的淋洗液伴随着大量的电解气，因此在淋洗液进入下游色谱之前需要采用脱气装置进行脱除。由于脱气所用的原材料极其昂贵，因此脱气装置的使用显著增加了系统成本，同时也增加了系统死体积，增加了梯度洗脱的延迟。

　　According to the different structure, the eluent generator can be roughly divided into two types: single-film type and double-film type. Single membrane type means that only one type of ion exchange membrane is used to separate the high-pressure eluent channel from the low-pressure reserve chamber, and one of the electrodes is directly placed in the high-pressure eluent channel. When the generator works, the eluent produced in the high-pressure eluent channel is accompanied by a large amount of electrolytic gas, so the eluent needs to be removed by a degassing device before it enters the downstream chromatography. Because the raw materials used for degassing are extremely expensive, the use of degassing device significantly increases the cost of the system, but also increases the dead volume of the system, and increases the delay of gradient elution.

　　为了解决这些问题，华东理工大学的杨丙成教授团队引入基于双膜型结构的淋洗液发生器。双膜型是使用阳离子交换膜和双极膜分别将电解槽和淋洗液发生器隔离开来，淋洗液通道与两个电极在空间上完全隔离。发生器在工作时产生的电解气仅存在于电解槽内，而不会进入淋洗液通道内，由此避免了脱气装置的使用，了因为脱气装置带来的缺陷；同时产生高纯度的氢氧化钾，无论产生的淋洗液浓度范围还是压力使用范围都可以很好地匹配现有的离子色谱系统。

　　To solve these problems, Professor Yang Bingcheng of East China University of Technology introduced a leachate generator based on double membrane structure. The double-membrane type uses cation exchange membrane and bipolar membrane to separate the electrolyzer from the eluent generator, and the eluent channel is completely separated from the two electrodes in space. The electrolyte gas generated by the generator only exists in the electrolytic cell, but does not enter the eluent channel, thus avoiding the use of the degassing device and eliminating the defects caused by the degassing device. At the same time, it generates high purity potassium hydroxide, which can well match the existing ion chromatography system regardless of the concentration range or pressure range of the eluent produced.