As a sodium tripolyphosphate (STPP) manufacturer, understanding the differences in the characteristics of type I and type II crystals is crucial for detergent formula design.
The difference between sodium tripolyphosphate type I (high temperature type) and type II (low temperature type) stems from the coordination mode of sodium ions in the crystal structure:
Dissolution rate and thermal stability
Type I: fast dissolution rate (suitable for liquid detergents that need to be dispersed quickly), but low thermal stability (easy to transform to type II above 417°C).
Type II: slow dissolution rate, but high thermal stability (stable below 400°C), suitable for high temperature production process.
Hygroscopicity and agglomeration risk
Type I: strong hygroscopicity, large hydration heat release, easy to cause powder agglomeration (such as common problems in laundry detergent storage).
Type II: slow moisture absorption, better powder fluidity, suitable for high humidity environment
Density difference
Type I has a density of 2.62 g/cm³, while Type II has a density of 2.57 g/cm³, which affects the bulk density design of detergents.
1. Liquid detergents
Type I is recommended: The fast dissolution characteristics can improve the uniformity of the formula and avoid liquid stratification (such as concentrated laundry detergent). It needs to be matched with the synergistic effect of additives (such as sodium pyrophosphate) to enhance the chelating ability.
2. Powdered detergents
Type II is preferred: Low hygroscopicity can reduce the problem of caking in storage, and anti-caking solutions (such as adding silica) can extend the shelf life.
3. Low-temperature formulas and environmentally friendly products
Type II is recommended: It complies with the trend of environmental regulations and compliance (such as the EU phosphorus restriction policy) and is suitable for low-temperature washing scenarios (such as cold water laundry detergent).
Problem background: A manufacturer uses Type I STPP to produce laundry detergent, which suffers from severe caking in the high temperature and high humidity environment of Southeast Asia, resulting in customer complaints.
Solution:
Crystal form replacement: switch to type II STPP to reduce moisture absorption by 30%.
Process optimization: adjust spray drying parameters to control the moisture content of powder to ≤0.1%.
Warehouse upgrade: use moisture-proof packaging and temperature-controlled warehousing to control humidity below 50%.
Result: agglomeration rate decreased by 85%, and customer repurchase rate increased by 20%.
1. Crystal form selection by mainstream manufacturers
According to 2025 production capacity data (Huajing Industry Research Institute):
Industrial-grade STPP: Type II accounts for more than 60% (due to shrinking demand for detergents, turning to industrial cleaning agent ingredients and flame retardant material development).
Food-grade STPP: Type I dominates (must comply with food additive standards, such as GB2760-2011).
2. Export market analysis
The export volume of food-grade STPP increased from 16% in 2015 to 38% in 2022, mainly to emerging markets such as Brazil and Thailand.
Industrial exports are concentrated in Indonesia and India, and attention should be paid to the trend forecast of phosphorus chemical industry (such as the impact of phosphorus-free substitutes).
Production process optimization: Spray drying-converter polycondensation two-stage method is used to improve type II purity (whiteness ≥ 90%).
Compliance layout: Adapt to environmental protection regulations in advance (such as China’s “phosphorus restriction” policy), and develop alternatives such as layered sodium silicate.
High added value expansion: Explore the application of food-grade STPP in water retention of meat products and improvement of noodle products.
Le tripolyphosphate de sodium (STPP) est un composé chimique commun largement utilisé dans les détergents, la transformation des aliments et les applications industrielles.
L'usine de Goway Fuquan augmente sa production pour répondre aux commandes du deuxième trimestre. Avec toutes les lignes de production fonctionnant à pleine capacité, l'entreprise se concentre sur la fourniture de produits à base de phosphate de haute qualité aux marchés nationaux et internationaux.
Goway Fuquan a construit une "cuisine centrale" de premier plan pour le traitement en profondeur des scories de phosphore jaune, transformant les déchets en produits de valeur. Grâce à des approches innovantes, l'entreprise renforce ses initiatives en matière de développement vert, favorisant ainsi la croissance environnementale et économique.
Cet article vous fournira des stratégies de sélection à partir de quatre dimensions : les propriétés physiques, l'adaptation des scénarios, l'analyse de cas et les données industrielles du tripolyphosphate de sodium.
Le 18 décembre, le secrétaire d'État de la province de Qian'nan s'est rendu à Goway Fuquan pour examiner les progrès accomplis par l'entreprise dans la réalisation de ses objectifs trimestriels et annuels, ainsi que pour guider les efforts de développement écologique de l'entreprise dans l'industrie du phosphate.
Sodium tripolyphosphate (STPP) is widely used as a food additive in processed foods. Its safety has been recognized by international authoritative organizations such as the FDA and WHO. However, the standard of Acceptable Daily Intake (ADI) must be followed, and consumers can make scientific choices by reading the ingredient list.
As a core detergent additive, sodium tripolyphosphate (STPP) can significantly improve detergency and reduce costs through scientific compatibility with ingredients such as sodium carbonate and sodium metasilicate.
As global environmental policies tighten, the application of sodium tripolyphosphate (STPP) in detergents faces strict restrictions.
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