Sodium Tripolyphosphate(STPP)
is an inorganic compound with the chemical formula Na₅P₃O₁₀.It belongs to the family of polyphosphate salts and appears as a white crystalline powder.It is highly soluble in water,and its aqueous solution is weakly alkaline(with a pH of approximately 9-10).STPP is widely used in industrial and food applications,primarily as an emulsifier,chelating agent,water softener,and preservative.
Appearance and properties: | White powder |
Density: | >1.5 g/cm3 (20ºC) |
Melting point: | 622 °C |
Water solubility: | 20 g/100 mL (20 ºC) |
Stability: | Stable. Incompatible with strong oxidizing agents, strong acids. Hygroscopic. |
Storage conditions: | Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture. |
RTECS Number: | YK4570000 |
Safety instructions: | S26-S36-S24/25 |
WGK Germany: | 1 |
Danger Class code: | R36/37/38 |
Customs Code: | 2835319000 |
Dangerous goods mark: | Xi |
appearance | White to light yellow crystalline powder |
Loss on drying | ≤1.0% |
pH value | 3.0-4.5 |
Water solubility (100g/L) | Colorless to pale yellow transparent liquid |
melting point | 111.0-116.0℃ |
content | ≥99.0% |
Suggested dosage | 0.5-3.0% |
Usage suggestions | The whitening and spot removing effect is most significant under pH 3.0-6.0 conditions; Easy to dissolve in water, easy to dissolve in ethanol, slightly soluble in oil and fat |
package | 1.0kg/bag |
storage condition | Sealed storage at room temperature |
quality guarantee period | 2 years |
Physical and Chemical Properties
• Appearance:White crystalline powder or granules.
• Density:2.52 g/cm³(at 20°C).
• Melting Point:622°C(decomposition).
• Solubility:Highly soluble in water,with a solubility of 20 g/100 mL at 20°C.
• pH Value:Weakly alkaline(9.0-10.0)in aqueous solution.
• Hygroscopicity:Hygroscopic,readily absorbs moisture from the air.
Production Method
STPP is typically produced through the reaction of phosphoric acid(H₃PO₄)with sodium hydroxide(NaOH)or sodium carbonate(Na₂CO₃).The process includes neutralization,polymerization,and cooling steps,ultimately yielding crystalline STPP.The production process is as follows
• Neutralization Reaction:Phosphoric acid reacts with a sodium source to form monosodium phosphate and disodium phosphate.
• Polymerization Reaction:The phosphate units are polymerized by controlled heating(350-450°C)to form STPP.
• Cooling and Formation:After cooling,the product is ground and sieved to obtain the desired powder or granular form.
Applications
STPP is widely used across multiple industries due to its multifunctional properties:
Detergent Industry
• Water Softening:Acts as a builder to soften water by preventing calcium and magnesium ions from binding with detergent,thereby enhancing cleaning efficiency.
• Anti-redeposition:Prevents stains from re-depositing on fabrics,improving overall washing performance.
•ood Industry
• Emulsifier and Preservative:Used in meats,seafood,and processed foods to retain moisture and improve texture.
• Canned Foods:Prevents spoilage and extends shelf life in canned products.
• Water Treatment Industry
• Scale Inhibitor:Removes calcium and magnesium ions from water to prevent scaling in pipes and equipment.
• Ceramics and Building Materials Industry
• Dispersant:Improves the dispersion and flowability of ceramic raw materials,reducing production defects.
Leather Industry
• Tanning and Softening:Used in the tanning and softening processes to remove fats and improve leather quality.
Other Applications
• Petroleum,Metallurgy,and Paper Industries:Used as a dispersant and water softener.
STPP Sodium tripolyphosphate
STPP Sodium tripolyphosphate
STPP Sodium tripolyphosphate
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