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Potassium hydroxide (KOH) is an important basic chemical raw material. Its core characteristics are strong alkalinity and high solubility in water, and together with its potassium content, it plays a key role in many industries.
main application areas:
Personal Care & Cleaning- Production of liquid soaps, pH adjustment in cosmetics, cleaning agents, drain cleaners
Chemical Industry-Production of potassium salts, petrochemical catalysts, gas purification
Battery Industry-Electrolyte for alkaline batteries and advanced energy devices
Food Industry-Food additive (acidity regulator), peeling agent, processing aid
Agriculture- Raw material for potash fertilizers, pH regulator for soil and pesticides
Pharmaceuticals, Textiles, etc.-- Drug synthesis, textile auxiliaries, absorbents, degreasing agents
Below are detailed descriptions of each application.
Personal Care & Cleaning: Liquid Soaps, Cosmetics, and Cleaners
Thanks to its mild saponification ability and high solubility, potassium hydroxide is widely used in this field:
Liquid Soaps & Detergents: This is a classic application. KOH reacts with natural oils (e.g., coconut oil) to form liquid potassium soaps with strong cleaning power and good solubility, which are the main ingredients in many hand soaps and body washes.
pH Adjustment in Cosmetics: In products like cold creams and shampoos, a small amount of KOH is used to adjust the pH to make them more skin-friendly.
Heavy-Duty Cleaners: Leveraging its strong alkalinity, it effectively breaks down grease and protein, making it a key component in strong household cleaners such as oven cleaners and drain openers.
Chemical Industry: From Laboratories to Large-Scale Plants
As the "cornerstone" of basic chemicals, KOH has many uses:
Production of Other Potassium Salts: It is a direct raw material for producing important potassium salts such as potassium carbonate, potassium permanganate, and potassium phosphate.
Industrial Catalyst: In petroleum refining, it helps remove organic acids and sulfur compounds; in biodiesel production, it serves as an efficient catalyst.
Gas Purification & Drying: Due to its strong alkalinity, it is often used to absorb acidic gases (e.g., CO₂, SO₂) from industrial exhaust. Its strong hygroscopicity also makes it an effective drying agent for alkaline solvents.
Battery Industry: Core Component of High-Performance Electrolytes
KOH is key to the performance of several battery types:
Alkaline Battery Electrolyte: It is the standard electrolyte for alkaline batteries such as Ni-MH, alkaline Zn-MnO₂, and similar types, typically used as a 30–50% aqueous solution.
Advanced Energy Carrier: It serves as the electrolyte in water electrolysis for hydrogen production; in supercapacitors, it is mixed with polymers like PVA to form gel electrolytes that offer both high conductivity and low volatility.
Application Boundary: KOH is a water-based electrolyte and is not used in lithium batteries, which require organic electrolytes.
Food Industry: Permitted Food Additive and Processing Aid
In the food sector, KOH also plays various roles (E525):
Processing Aid: Commonly used for **chemical peeling of fruits and vegetables** (e.g., potatoes), softening olives, making lye pretzels, and processing cocoa beans.
Food Additive: It can be used as an acidity regulator, stabilizer, and thickener in products like ice cream and chocolate.
Agriculture: Plant Nutrition, Soil Conditioning, and Crop Protection
Providing essential potassium to crops is its core agricultural value:
Raw Material for Potash Fertilizers: It is a key base material for producing high-quality potassium fertilizers such as compound fertilizers and water-soluble fertilizers, especially suitable for crops sensitive to chloride ions.
pH Regulator: It can be used to amend acidic soils, or as a pH regulator in pesticides and foliar fertilizers to improve efficacy and safety.
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