Potassium hydroxide can be obtained by electrolysis of high purity aqueous potassium chloride solution. The type of electrolyzer used and the production process are similar to sodium hydroxide. When the diaphragm electrolyzer is used, the obtained electrolyte contains 10% - 15% (mass) potassium hydroxide and about 10% (mass) potassium chloride. After evaporation, concentration and cooling, most of the potassium chloride crystallizes and precipitates. After separation, the product containing 45% - 50% potassium hydroxide (containing 0.6% potassium chloride) is obtained. High purity potassium hydroxide can be produced by mercury electrolysis, but the content of heavy metal impurities in the aqueous solution of potassium chloride should be controlled below 0.1ppm to avoid high hydrogen content in chlorine gas. Special ion exchange membrane must be used for the ion-exchange membrane electrolysis. Potassium hydroxide is more difficult to dehydrate than sodium hydroxide. The purity of industrial solid potassium hydroxide is 88% - 92%. There are two kinds of solid: block and sheet. Liquid potassium hydroxide has two concentration specifications of 45% and 50%.

主要應用:

Main applications:

氫氧化鉀是基礎化學工業中的重要產品，主要用作鉀鹽和鉀堿的生產原料，在醫 藥、輕工業、電化工、紡織等領域也有廣泛應用。應用舉例如下：一種以甲苯作為反應的緩沖劑，用氫氧化鉀作催化劑將甲基環硅氧烷在一定溫度和壓力 的條件下進行開環聚合，再用硫酸進行水解中和，減壓脫去甲苯制 得粘度為20～40CS，羥基含量在2～12％以上的小分子羥基硅油。本發 明的用氫氧化鉀催化合成小分子羥基硅油的方法采用甲基環硅氧烷為 原料，以甲苯作為反應緩沖劑，用氫氧化鉀作催化劑，硫酸作中和劑在 水中進行開環聚合，(1)原材料的組分質量份配比為：甲基環硅氧烷為100 質量份、氫氧化鉀10～70質量份、甲苯70～120質量份、硫酸8.5～60 質量份；(2)工藝控制條件：反應溫度100～150℃、反應時間2～7小時、 水解溫度30～70℃、水解時間1～3小時、攪拌轉速大于70轉/分鐘。

Potassium hydroxide is an important product in the basic chemical industry. It is mainly used as raw material for the production of potash and potash. It is also widely used in medicine, light industry, electrochemistry, textile and other fields. The application examples are as follows: a kind of small molecular hydroxy silicone oil with viscosity of 20-40cs and hydroxyl content of more than 2-12% was prepared by using toluene as buffer, potassium hydroxide as catalyst, methyl cyclosiloxane as ring opening polymerization under certain temperature and pressure, sulfuric acid as hydrolysis neutralization, and finally toluene was removed under reduced pressure. The method for synthesizing small molecular hydroxyl silicone oil by catalysis of potassium hydroxide adopts methylcyclosiloxane as raw material, toluene as reaction buffer, potassium hydroxide as catalyst, sulfuric acid as neutralizer to conduct ring opening polymerization in water, (1) the mass ratio of the components of the raw material is 100 Mass fraction, potassium hydroxide 10-70 mass fraction, toluene 70-120 mass fraction, sulfuric acid 8.5-60 mass fraction; (2) process control conditions: reaction temperature 100-150 ℃, reaction time 2-7 hours, hydrolysis temperature 30-70 ℃, hydrolysis time 1-3 hours, stirring speed greater than 70 rpm.

制作方法;

Production method;

方法1：離子膜發生產氫氧化鉀。離子膜氫氧化鉀生產系統由一次鹽水精制、二次鹽水精制、淡鹽水脫氯、氯氫處理系統、蒸發濃縮系統組成。離子膜液堿生產所需原料主要有飽和精鹽水、鹽酸、KOH、螯合樹脂、純水、亞硫酸鉀及用于膠墊固定的粘合劑、抗粘合劑。

Method 1: potassium hydroxide was produced by ion-exchange membrane. The production system of ion-exchange membrane potassium hydroxide is composed of primary brine refining, secondary brine refining, light brine dechlorination, hydrogen chloride treatment system and evaporation concentration system. The raw materials for the production of ionic membrane liquid alkali mainly include saturated refined brine, hydrochloric acid, Koh, chelating resin, pure water, potassium sulfite, and adhesives and anti adhesives for rubber pad fixation.

方法2：一種高純氫氧化鉀產品的制備方法，包括以下步驟：

Method 2: a preparation method of high-purity potassium hydroxide product includes the following steps:

(1) 取工業氫氧化鉀溶于超純水中，攪拌過濾除雜；

(1) The industrial potassium hydroxide is dissolved in ultra pure water, and the impurities are removed by stirring filtration;

(2) 往濾液中繼續加入絡合劑，冷凍并保持液體狀態，產生水和氫氧化鉀結晶；

(2) Continue to add complexing agent into filtrate, freeze and keep liquid state to produce water and potassium hydroxide crystal;

(3) 收集水合氫氧化鉀結晶，取其加熱溶化即得到高純度的氫氧化鉀溶液產品，而在惰性氣體保護下加熱烘干則得到高純度固體氫氧化鉀產

(3) Collect the crystal of hydrated potassium hydroxide, take it for heating and dissolving to get high-purity potassium hydroxide solution product, while under the protection of inert gas heating and drying to get high-purity solid potassium hydroxide production