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

主含量是指成品中KOH的質量分數，這是確定固體氫氧化鉀質量主要的參數之一，一般要求含量大于90%。生產過程中控制好堿液的溫度是關鍵。1.148%堿液濃度在經過一效、二效蒸發器蒸發只有，堿液濃度需要達到或大于48%，為后面進行的工序質量合格做好準備。

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 more than 90%. The key is to control the temperature of alkali liquor in the production process. 1.148% of the alkali liquor concentration needs to reach or exceed 48% after being evaporated by the first and second effect evaporators, so as to prepare for the quality of the subsequent process.

這個過程主要是通過蒸氣冷凝產生的熱量用來蒸發堿液中的水分從而提高濃度，因此需要能夠保證蒸氣的壓力和溫度達到相應的要求：真空狀態下可以降低堿液沸點，所以為了節約能源和提升效率，蒸發器中的真空度要盡量保持一個比較高的狀態。二效蒸發器堿液真空度處于0.085~0.094MPa，溫度在75~85攝氏度之間，效果是比較好的。

In this process, the heat generated by steam condensation is used to evaporate the water in the alkali liquor, so as to improve the concentration. Therefore, it is necessary to ensure that the pressure and temperature of the steam can 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 alkali liquor in the two effect evaporator is between 0.085 ~ 0.094 MPa, and the temperature is between 75 ~ 85 ℃.

1、提高高壓蒸氣的壓力和溫度

1. Increase the pressure and temperature of high pressure steam

升膜蒸發器以高壓蒸氣為加熱介質，可以繼續提高堿液的濃度，固體氫氧化鉀堿液溫度一般在190~210攝氏度之間比較適宜。

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

2、氫氣燃燒爐及熔鹽系統

2. Hydrogen combustion furnace and molten salt system

濃縮制片過程需要使用熔融鹽HTS為加熱介質，而加熱BTS是使用氫氣燃燒爐來提供熱源的。燃燒爐提供的熱量要保證穩定，這樣才能確保熔鹽溫度和流量的穩定，才能生成足夠量的穩定熱量來加熱堿液，使經過濃縮器后的堿液溫度達到標準要求，一般在380-400攝氏度之間。

Molten salt HTS is used as heating medium in the process of concentrating and making slices, and hydrogen combustion furnace is used to provide heat source for heating BTS. The heat provided by the combustion furnace should be stable, so as to ensure the stability of the molten salt temperature and flow, and generate enough stable heat to heat the alkali liquor, so that the alkali liquor temperature after the concentrator can meet the standard requirements, generally between 380-400 ℃.

3、保持系統密閉

3. Keep the system closed

為了避免堿液溫度降低和發生潮解，降低其中的K0H含量，堿液在從濃縮器片堿機的流動過程中需要盡量保持密閉狀態，避免和空氣進行接觸。

In order to avoid the decrease of temperature and deliquescence of lye, and reduce the content of k0h, the flow of lye from concentrator to flake caustic soda machine should be kept as closed as possible to avoid contact with air.

以上就是關于固體氫氧化鉀主含量低的解決方法，我們總結了幾種常用的解決方法分別是，提高高壓蒸氣的壓力和溫度、氫氣燃燒爐及熔鹽系統以及保持系統密閉的方法。那么，大家今后在遇到產品主含量偏低的情況下就可以采用這些方法來提高產品的純度，保證后期的使用效果。

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