Sodium Tripolyphosphate
Industrial-grade and food-grade anhydrous sodium tripolyphosphate synthesized via thermal phosphoric acid neutralization and rotary kiln polycondensation (350°C to 550°C). CAS: 7758-29-4.
- Product Introduction
Sodium Tripolyphosphate (Na5P3O10, STPP) Technical Product Page：
Industrial-grade and food-grade anhydrous sodium tripolyphosphate synthesized via thermal phosphoric acid neutralization and rotary kiln polycondensation (350°C to 550°C). CAS: 7758-29-4.
Technical Specifications & Analytical Parameters：
|
Parameter |
Industrial Grade (Standard) |
Food Grade (FCC / E451) |
Analytical Test Method |
|
Assay (Na5P3O10) |
>= 94.0% |
>= 95.0% |
Titrimetry |
|
P2O5 Content |
>= 57.0% |
>= 57.5% |
Gravimetric Quinoline Molybdate |
|
Phase I Content |
10% - 30% (Low Hydration) / 40% - 70% (High) |
Custom Spec |
X-Ray Diffraction (XRD) |
|
pH Value (1% Solution) |
9.2 - 10.1 |
9.2 - 10.0 |
Potentiometric Determination |
|
Whiteness |
>= 90.0% |
>= 92.0% |
Hunter Lab Colorimeter |
|
Water Insoluble Matter |
<= 0.1% |
<= 0.05% |
Gravimetry (50°C Water Digestion) |
|
Heavy Metals (as Pb) |
<= 0.001% |
<= 0.0005% |
ICP-OES |
|
Arsenic (As) |
<= 0.0003% |
<= 0.0001% |
Atomic Fluorescence Spectrometry |
|
Iron (Fe) |
<= 0.005% |
<= 0.003% |
1,10-Phenanthroline Colorimetry |
Product Selection Guide: Grade & Form Identification：
Industrial Grade: Manufactured for detergent manufacturing, ceramic slip deflation, and industrial boiler feed water softening. Iron content is strictly maintained below 0.005% to eliminate discoloration risks in aqueous slurries.
Food Grade (FCC): Produced in dedicated, isolated crystallization and drying lines to meet strict microbiological and heavy metal criteria for meat tenderization, seafood moisture retention, and dairy buffering.
Anhydrous Powder (90% passing 100-mesh): High specific surface area ensures rapid dissolution in spray-dried detergent slurry mixing. Requires strict moisture barrier protection during storage.
Granular Form: Dust-free particle distribution (0.42 - 1.41 mm) engineered for dry-blend automatic dishwashing detergents and automated industrial water treatment dosing systems, preventing premature lumping.
Application Matrix & Performance Criteria：
[Formulation Target] ---> [Physicochemical Mechanism] ---> [Industrial Outcome] Detergent Compounding Ca2+ / Mg2+ Sequestration Prevents surfactant precipitation Ceramic Slip Preparation Zeta Potential Modification Lower slurry viscosity at high solids loading Industrial Water Systems Threshold Scale Inhibition Blocks CaCO3 crystal growth on heat exchangers
Detergent Formulation: Acts as an alkaline builder that coordinates with hardness ions (Ca2+, Mg2+), stabilizes wash water pH (9.2 - 10.1), and deflocculates suspended soil particles. Phase I/II ratios are adjusted to control hydration exotherm and prevent setting blockages in high-speed powder blenders.
Ceramic Slip Deflocculation: Adsorbs onto clay platelet edges, increasing negative surface charge density. This electrostatic repulsion reduces fluid viscosity, allowing higher solid content slurries (> 65% solid load) with lower water demand during slip casting.
Water Treatment Antiscalant: Interferes with crystal lattice formation of calcium carbonate and calcium sulfate at sub-stoichiometric concentrations (2 - 5 ppm), protecting industrial heat exchanger tubes and boiler surfaces from mineral scaling.
Manufacturing Process & Quality Control：
Production follows thermal-route or refined wet-process phosphoric acid neutralization:
Neutralization: High-purity thermal phosphoric acid (H3PO4) reacts stoichiometrically with soda ash (Na2CO3) in agitated mixing tanks to yield a precise 5:3 molar ratio sodium orthophosphate solution (Na2O/P2O5 = 1.67).
Calcination: The concentrated slurry is fed into a direct-fired rotary kiln operating at 350°C to 550°C, driving off water of crystallization and forcing polycondensation into pentasodium tripolyphosphate.
Phase Modification: Kiln discharge cooling rates regulate crystal structures. Rapid cooling yields higher Phase I content (Na5P3O10-I) for rapid hydration; controlled slow cooling produces stable Phase II (Na5P3O10-II) to extend shelf life in humid climates.
Milling & Air Classification: Clinkers pass through air-swept impact mills and multi-deck centrifugal sifters to isolate targeted particle size fractions.
Quality Assurance Testing: Each production lot undergoes automated sampling. Analytical results for assay, pH, heavy metals (ICP-OES), and whiteness are compiled into a lot-specific Certificate of Analysis (COA).
Supplier Evaluation Criteria：
Line Segregation: Verify whether the supplier operates dedicated production and packaging lines for food-grade versus industrial-grade materials to eliminate cross-contamination risks.
Packaging Integrity: STPP is hygroscopic and forms stable hexahydrates (Na5P3O10 · 6H2O) upon moisture contact, leading to severe caking. Standard packaging requires multi-wall kraft paper bags with inner high-density polyethylene (HDPE) thermal-sealed liners (25 kg) or polyethylene-lined woven jumbo bags (1,000 kg).
Regulatory Compliance: Ensure suppliers provide full REACH dossier registration numbers for EU import, ISO 9001 quality management certificates, and Kosher/Halal certification for food ingredients.
Traceability: Lot codes stamped on bags must link directly to raw material phosphate rock source records, kiln temperature logging charts, and archived laboratory retention samples.
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