Solid potassium hydroxide is a common chemical product, which is often used as a chemical raw material, but sometimes we will find that the main content of the main product does not meet the requirements when we use it, if so, it will affect the subsequent production effect. So, when the main content of the product is low, how can we solve it? Let's take a look.

主含量是指成品中KOH的质量分数，这是确定固体氢氧化钾质量主要的参数之一，一般要求含量大于90%。生产过程中控制好碱液的温度是关键。1.148%碱液浓度在经过一效、二效蒸发器蒸发只有，碱液浓度需要达到或大于48%，为后面进行的工序质量合格做好准备。这个过程主要是通过蒸气冷凝产生的热量用来蒸发碱液中的水分从而提高浓度，因此需要能够保证蒸气的压力和温度达到相应的要求：真空状态下可以降低碱液沸点，所以为了节约能源和提升效率，蒸发器中的真空度要尽量保持一个比较高的状态。二效蒸发器碱液真空度处于0.085~0.094MPa，温度在75~85摄氏度之间，效果是比较好的。

The main content refers to the mass fraction of KOH in the finished product, which is one of the main parameters to determine the quality of solid potassium hydroxide. Generally, the content is required to be greater than 90%. It is the key to control the temperature of lye in the production process. 1.148% alkali liquor concentration can only be evaporated by the first and second effect evaporators, and the alkali liquor concentration needs to reach or exceed 48%, so as to make preparation for the quality of subsequent processes. This process is mainly used to evaporate the water in the alkali liquor through the heat generated by the steam condensation to improve the concentration. Therefore, it is necessary to ensure that the pressure and temperature of the steam meet the corresponding requirements: the boiling point of the alkali liquor can be reduced in the vacuum state, so in order to save energy and improve efficiency, the vacuum degree in the evaporator should be kept as high as possible. The vacuum degree of the alkali liquor of the two effect evaporator is 0.085-0.094mpa, and the temperature is 75-85 ℃. The effect is good.

1、提高高压蒸气的压力和温度

1. Increase the pressure and temperature of high pressure steam

升膜蒸发器以高压蒸气为加热介质，可以继续提高碱液的浓度，固体氢氧化钾碱液温度一般在190~210摄氏度之间比较适宜。

The rising film evaporator takes high pressure steam as heating medium, which can continue to increase the concentration of alkali liquor. The temperature of solid potassium hydroxide alkali liquor is generally suitable between 190~210 ℃.

2、氢气燃烧炉及熔盐系统

2. Hydrogen combustion furnace and molten salt system

浓缩制片过程需要使用熔融盐HTS为加热介质，而加热BTS是使用氢气燃烧炉来提供热源的。燃烧炉提供的热量要保证稳定，这样才能确保熔盐温度和流量的稳定，才能生成足够量的稳定热量来加热碱液，使经过浓缩器后的碱液温度达到标准要求，一般在380-400摄氏度之间。

In the process of concentration and production, the molten salt HTS is used as the heating medium, while the heating BTS uses the hydrogen combustion furnace to provide the heat source. The heat provided by the combustion furnace shall be stable, so as to ensure the stability of molten salt temperature and flow, generate enough stable heat to heat the alkali liquor, and make the temperature of alkali liquor after passing through the concentrator reach the standard requirements, generally between 380-400 ℃.

3、保持系统密闭

3. Keep the system closed

为了避免碱液温度降低和发生潮解，降低其中的K0H含量，碱液在从浓缩器片碱机的流动过程中需要尽量保持密闭状态，避免和空气进行接触。

In order to avoid the decrease of temperature and deliquescence of alkali liquor and the decrease of k0h content, it is necessary to keep the alkali liquor closed as much as possible during the flow process from the concentrator to the flaker to avoid contact with air.

以上就是关于固体氢氧化钾主含量低的解决方法，我们总结了几种常用的解决方法分别是，提高高压蒸气的压力和温度、氢气燃烧炉及熔盐系统以及保持系统密闭的方法。那么，大家今后在遇到产品主含量偏低的情况下就可以采用这些方法来提高产品的纯度，保证后期的使用效果。

The above is about the solution to the low main content of solid potassium hydroxide. We summarized several common solutions, namely, to improve the pressure and temperature of high-pressure steam, hydrogen combustion furnace and molten salt system, and to keep the system closed. Then, you can use these methods to improve the purity of the product in the future when the main content of the product is low, so as to ensure the later use effect.