1. The raw material of diaphragm electrolysis is potassium hydroxide dissolves into saturated solution in the salt bath. Potassium carbonate, caustic potassium and barium chloride are added to remove impurities such as calcium, magnesium and sulfate at 90 ~C respectively. The refined potassium hydroxide solution containing 280 to 315 g/L of potassium hydroxide is preheated to 70~75 ~C for electrolysis to obtain potassium hydroxide, chlorine and hydrogen. The concentration of potassium hydroxide obtained by diaphragm method is 10% to 11%. The solution containing 45% to 50% potassium hydroxide is prepared by evaporation, concentration and cooling clarification. The solid potassium hydroxide can also be obtained by continuous concentration in soda pot, decolorization, or flake-like potassium hydroxide products.

　　2.水銀電解法電解液的配制同隔膜電解法。電解室中以石墨(或金屬)作陽極，水銀作陰極，電解產生的氯氣送氯氣干燥工序，生成的鉀汞齊流入解汞室。大部分未反應的氫氧化鉀以淡鹽水狀態經處理后，返回原料溶解工序。鉀汞齊與清水反應生成氫氧化鉀和氫氣。因解汞室出來的氫氧化鉀濃度為45%50%，可作為液體氫氧化鉀產品，也可再經熬堿鍋蒸濃成固堿或制成片狀氫氧化鉀產品。

　　2. Preparation of electrolyte for mercury electrolysis and diaphragm electrolysis. Graphite (or metal) is used as the anode and mercury as the cathode in the electrolysis chamber. The chlorine gas produced by the electrolysis is sent to the chlorine gas drying process, and the potassium amalgam produced is flowed into the chamber. Most unreacted potassium hydroxide is treated in dilute brine and returned to the raw material dissolution process. Potassium amalgam reacts with clear water to produce potassium hydroxide and hydrogen. Because the concentration of potassium hydroxide from the mercury dissolving chamber is 45% to 50%, it can be used as liquid potassium hydroxide product, and can be steamed and concentrated to solid alkali or made into flake potassium hydroxide product by boiling soda pot.

　　3.工業上制取氫氧化鉀是電解氫氧化鉀的水溶液。因為氫氧化鉀比氫氧化鈉難脫水，市售品的純度一般只能達到85%86%。如需提純可按照提純氫氧化鈉的相同的方法進行提純。

　　3. Industrial production of potassium hydroxide is an aqueous solution of electrolytic potassium hydroxide. Because potassium hydroxide is more difficult to dehydrate than sodium hydroxide, the purity of commercial products can only reach 85% to 86%. Purification can be carried out in the same way as the purification of sodium hydroxide.

　　4.氫氧化鉀經精制后，預熱，不斷注入電解槽中，電解生成液經濃縮、脫色而得。

　　4. Potassium hydroxide is refined, preheated and continuously injected into the cell. The electrolyte is concentrated and decolorized.

　　5.采用離子交換膜法，以工業品氫氧化鉀作為陽極室物質，純水作為陰極室物質，在直流場作用下，K+離子透過具有選擇性的陽膜進入陰極室與OH-離子生成試劑氫氧化鉀，經濃縮、干燥得固體氫氧化鉀。氣體產物O2、H2分別由導管排出。

　　5. Using ion exchange membrane method, potassium hydroxide as anode chamber material, pure water as cathode chamber material, under the action of DC field, K + ion enters the cathode chamber through selective anode membrane to form reagent potassium hydroxide with OH-ion. Solid potassium hydroxide is obtained by concentration and drying. The gas products O 2 and H 2 are discharged from the catheter respectively.