Potassium carbonate
[CAS# 584-08-7]

Identification

• Classification: API >> Water, electrolyte and acid-base balance regulator >> Acid-base balance regulator
• Name: Potassium carbonate
• Synonyms: Potassium carbonate anhydrous
• Molecular Formula: K₂CO₃
• Molecular Weight: 138.19
• CAS Registry Number: 584-08-7
• EC Number: 209-529-3
• SMILES: C(=O)([O-])[O-].[K+].[K+]

Properties

• Density: 2.43
• Melting point: 891 °C
• Water solubility: 1120 g/L (20 °C)

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H302-H315-H319-H335
• Safety Statements: P261-P264-P270-P271-P280-P301+P312-P302+P352-P304+P340-P305+P351+P338-P330-P332+P313-P337+P313-P362-P403+P233-P405-P501

Discovery and Applications

Potassium carbonate dates back to ancient times when it was derived from wood ash and used to make soap and glass. Its crude form, called "pearl ash," was obtained by leaching wood ash and evaporating the solution. Over the centuries, refining processes evolved that made potassium carbonate one of the first compounds used in industrial practice. Modern potassium carbonate production is the reaction of potassium hydroxide (KOH) with carbon dioxide (CO2). This method produces a white, water-soluble powder with a strong alkalinity. Potassium carbonate's ability to absorb moisture and dissolve easily in water makes it suitable for a variety of chemical processes and applications.

Potassium carbonate's versatility has led to its widespread use in various industries. In glassmaking, it can be used as a flux, lowering the melting point of glass and enhancing its optical properties. It acts as a flux in ceramic production, increasing the strength and durability of ceramic materials.

Potassium carbonate has historical significance in soap making and is still used today to produce liquid soaps and detergents. Its alkalinity aids in saponification, converting fats and oils into soap and glycerin. The resulting potassium soaps are softer and more soluble in water than sodium-based soaps.

In agriculture, potassium carbonate can be used as a fertilizer and pH adjuster. It provides a source of potassium, an essential nutrient for plant growth, improving crop yields and soil quality. It is used as a pH buffer in various formulations to help maintain optimal conditions for agricultural and environmental processes.

Potassium carbonate is widely used in the food and beverage industry, especially in the production of cocoa and chocolate. It acts as a buffer, stabilizing pH and improving the flavor and color of cocoa products. Its use also extends to the brewing industry, where it can adjust the acidity of brewing water to improve the quality of beer.

In the pharmaceutical industry, potassium carbonate is used as an alkalizing agent in formulations to help stabilize certain drugs and improve their efficacy. It acts as a reagent in various chemical reactions in laboratory settings, supporting research and development in pharmaceutical chemistry.

Potassium carbonate's environmentally friendly nature is consistent with sustainable practices. It helps neutralize acidic conditions and precipitate impurities during water treatment, thereby cleaning water resources. In addition, its production and application have minimal impact on the environment, which strengthens its role in green chemistry projects.

Ongoing research is exploring innovative applications and production methods for potassium carbonate. Advances in green chemistry and sustainable manufacturing processes aim to increase its utility while minimizing its impact on the environment. The development of new formulations and applications is expected to expand its role in emerging industries and technologies.

References

2024. Pyrolysis-derived activated carbon from Colombian cashew (Anacardium occidentale) nut shell for valorization in phenol adsorption. Adsorption.
DOI: 10.1007/s10450-024-00574-4

2024. Tris{2-[N-(quinolin-8-yl)carbamoylmethoxy]phenyl}phosphine oxide: synthesis and coordination properties. Russian Chemical Bulletin.
DOI: 10.1007/s11172-024-4419-z

2023. Preparation and Characterization of Adsorbent from Oil Palm Empty Fruit Bunches Activated with KOH. The 6th Mechanical Engineering, Science and Technology (MEST 2022) International Conference.
DOI: 10.2991/978-94-6463-134-0_16