​Potassium Malate In-house standard

Product Details

CasNo： 585-09-1

MF： C4H6O5.2K

Appearance： powder

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 99%

1. Basic Information​

• Chinese Name: Potassium Malate​

• English Name: Potassium Malate or Dipotassium Malate​

• CAS Number: 585 - 09 - 1 (anhydrous); 27132 - 73 - 9 (hydrate)​

• Molecular Formula: Anhydrous potassium malate is ​C4​H4​K2​O5​
• , and potassium malate hydrate is ​C4​H5​KO5​⋅nH2​O
• (​n=0or ​1)​
• Molecular Weight: 172.26 (for ​C4​H5​KO5​, anhydrous); 210.2682 (​C4​H4​K2​O5​)​

2. Physical and Chemical Properties​

• Appearance: It appears as a white powder.​

• Odor: Odorless.​

• Taste: Tasteless.​

• Solubility: It is highly soluble in water, while insoluble in ethanol. It has a solubility of approximately 21g/100mL at room temperature. In addition, it has a tendency to absorb moisture from the air and deliquesce.​

3. Quality Standards​

Taking the product of Zhengzhou Ruipu as an example:​

• DL - Potassium Malate Content: ≥98.0%​

• Loss on Drying: ≤2.0%​

• pH (2g/100mL Aqueous Solution): 3.5 - 4.5​

• Heavy Metals (calculated as Pb): ≤0.002%​

• Arsenic (calculated as As): ≤2.0mg/kg​

4. Main Applications​

• Food Industry​

• Acidity Regulator, Buffer, and Flavor Enhancer: Potassium malate is used to adjust the acidity of food. It can balance and soften the taste of food, enhancing the overall flavor. It is commonly added to beverages, dairy products, pastries, and other food items. For instance, in beverages, the addition amount is generally 0.1% - 0.3%; in dairy products, it is about 0.2% - 0.5%; and in pastries, it is usually 0.3% - 0.5%.​

• Nutritional Supplement: It can be used as a potassium - containing nutritional supplement in certain foods, helping to meet the body's potassium requirements.​

• Tobacco Industry​

• Cigarette Combustion Aid and Flavor Improver: It is an ideal substitute for traditional cigarette combustion aids. Potassium malate can accelerate the burning rate of tobacco, reduce tar emissions, and ensure more complete combustion of tobacco. To some extent, it can also increase the acidity of tobacco, improve the taste, enhance the aroma, and reduce irritation and off - flavors. The recommended addition amount is 1.5% - 1.7%.​

• Industrial Applications​

• Metal Ion Chelating Agent: In industrial production, such as in water treatment and electroplating industries, it can chelate metal ions, forming stable complexes to remove metal ions from solutions.​

• Textile Auxiliary Component: It can be used in the anti - static treatment of natural fibers like wool and silk, and also as an auxiliary component in dye fixing agents to improve the adhesion of dyes to fibers.​

5. Packaging​

• Usually packed in 25kg cartons (for the monohydrate product) or 25kg paper bags (for the anhydrous product).​

6. Production Method​

Typically, it is produced by the neutralization reaction of malic acid with potassium hydroxide. First, malic acid is dissolved in an appropriate amount of water, and then potassium hydroxide solution is slowly added. During this process, strict control of reaction conditions such as temperature and pH value in the reaction system is required to ensure the full reaction of the two substances to form potassium malate. After the reaction is completed, the potassium malate product is obtained through steps such as filtration, concentration, crystallization, and drying.