H₃PO₄ Phosphoric Acid 85% (Food Grade)
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Product Name: Phosphoric Acid 85% (Food Grade)
Assay (Content): 85%
CAS No.: 7664-38-2
EINECS No.: 231-633-2
Molecular Formula: H₃PO₄
Molecular Weight: 98.00
Hazard Identification Number: UN 3151 Corrosive Substances
UN Number: Hazard Class 8: Corrosive Substances
Hazard Classification: 85% Food Grade Phosphoric Acid (Thermal) , 75% / 50% Food Grade Phosphoric Acid , Food Grade Phosphoric Acid (Purified Wet Process)
CERTIFICATES
H₃PO₄ Phosphoric Acid 85% (Food Grade)
I. Physicochemical Properties
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Appearance & Character: Pure product is a colorless, viscous liquid without distinct odor. Industrial-grade refined food-grade products may appear faint yellow (due to trace impurities, does not affect usage), exhibiting strong hygroscopicity and readily absorbing moisture from air.
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Key Physical Parameters:
• Relative Density (water = 1, 20°C): 1.685 g/cm³ (85% concentration)
• Melting Point: 42.35°C (pure crystalline form)
• Boiling Point: 261°C (85% concentration, decomposes to pyrophosphoric acid)
• Solubility: Highly soluble in water; miscible with ethanol and glycerol in any ratio. Aqueous solution is strongly acidic (pH≈1 when 85% concentration diluted 1000-fold). -
Chemical Stability: Stable under normal temperature and pressure; non-oxidizing and non-explosive. Dehydrates at high temperatures to form pyrophosphoric acid (H₄P₂O₇) and metaphosphoric acid (HPO₃). Reacts with alkalis to form phosphates and with metal oxides to yield corresponding phosphates. No harmful reactions with common food components (e.g., sugars, proteins).
II. Core Production Processes (Food-Grade Refined)
| Process Type | Raw Materials | Key Steps | Product Features |
|---|---|---|---|
| Thermal Refinement | Yellow phosphorus (≥99.9%), air, water | P₄ combustion → P₂O₅ hydration → As removal (sulfide precipitation) → Heavy metal removal (chelating resin) → Decolorization (activated carbon) → Concentration | High purity (minimal impurities), As ≤0.5mg/kg, complies with strict food standards for high-end applications |
| Wet Process Refinement | Crude wet-process acid, purifying agents | Pretreatment → Solvent extraction → Back-extraction → Heavy metal removal (ion exchange) → Concentration | Cost-effective, meets basic food requirements, As ≤1.0mg/kg, for general food additive use |
III. Quality Standards (GB 3149-2015 Compliance)
| Test Parameter | Requirement (85%) | Typical Value | Unit |
|---|---|---|---|
| Phosphoric Acid (H₃PO₄) | ≥85.0 | 85.3 | % |
| Arsenic (As) | ≤0.5 | 0.2 | mg/kg |
| Heavy Metals (as Pb) | ≤1.0 | 0.3 | mg/kg |
| Lead (Pb) | ≤0.1 | 0.05 | mg/kg |
| Fluoride (F) | ≤5.0 | 2.1 | mg/kg |
| Chlorides (as Cl) | ≤50.0 | 12.3 | mg/kg |
| Sulfates (as SO₄) | ≤100.0 | 35.6 | mg/kg |
| Oxidizable Substances (as H₂O₂) | ≤10.0 | 3.2 | mg/kg |
IV. Primary Applications (Food Processing)
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Food Additives:
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Acidity regulator: Carbonated beverages, fruit juices, fermented milk drinks (pH adjustment, taste enhancement, microbial inhibition)
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Flavor enhancer: Jams, jellies, preserves (acid-sweet balance and flavor profiling)
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Chelating agent: Meat products (ham, sausage) to retard fat oxidation and extend shelf life
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Fermentation aid: Brewing (beer, wine) to optimize yeast activity
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Food Processing Auxiliaries:
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Fruit/vegetable processing: Peeling agent (e.g., potatoes, carrots) via acidic dissolution of cuticle
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Dairy: pH adjustment in cheese production for controlled curdling
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Bakery: Leavening agent (partial yeast replacement) in biscuits/cakes through reaction with NaHCO₃
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Other Food-Related Uses:
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Drinking water treatment: pH adjustment for taste improvement
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Food packaging: Raw material for antistatic agents in plastic films
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Feed additive (food-grade extension): Phosphorus supplementation in animal feed
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V. Safety & Protection Guidelines (Food-Grade Focus)
(I) Hazard Overview
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Operational Hazards: Strongly corrosive; causes skin burns/eye damage; inhalation of vapors irritates respiratory tract
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Food Safety: Safe within GB 2760 limits; excessive intake may disrupt calcium-phosphorus balance
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Environmental Impact: Untreated discharge acidifies water bodies
(II) Handling & Storage
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Operations:
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Wear acid-resistant gloves (nitrile), goggles, chemical suits, and masks (high-concentration scenarios)
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Always add acid to water slowly with stirring (NEVER reverse)
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Ensure ventilation, emergency showers, and eye wash stations; prohibit eating/smoking in work areas
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Storage:
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Cool (≤30°C), dry, ventilated area away from ignition sources
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Use PE plastic or plastic-lined steel drums; seal tightly
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Separate from foodstuffs, alkalis, and metal powders; provide spill containment
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(III) Emergency Procedures
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Spills: Contain with sand/lime; collect in corrosion-resistant containers for professional disposal
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First Aid:
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Skin: Remove clothing, flush with water ≥15 min, apply mild alkaline ointment
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Eyes: Irrigate with saline/water ≥15 min, seek immediate medical care
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Inhalation: Move to fresh air, administer oxygen if needed
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Ingestion: Drink milk/egg white (DO NOT induce vomiting), seek urgent medical attention
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Firefighting: Use water spray to cool containers; firefighters require full protective gear
(IV) Transportation
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Food-grade PE drums with "Food Grade Phosphoric Acid," "Corrosive," and "Handle with Care" labels
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Transport in certified corrosion-resistant vehicles; never mix with foodstuffs/alkalis/oxidizers
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Avoid sunlight, rain, high temperature, and impact; carry neutralizers and spill response tools
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