Herstellung von Phosphorsäure in Lebensmittelqualität
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Die säuerliche Säure hinter Colagetränken
Übersicht
Food-grade phosphoric acid is produced by the thermal (furnace) process, burning elemental phosphorus in air and absorbing the resulting P₂O₅ in water. Unlike the cheaper wet process used for fertilizers, the thermal process yields high-purity acid suitable for food and beverage applications. Phosphoric acid is the characteristic acidulant in cola beverages, providing the sharp, tangy taste. It is also used in processed cheese, jams, and as a pH adjuster in numerous food products.
Chemischer Prozess
Elemental phosphorus (P₄) is burned in excess air at 1,500-1,800 degrees C to form phosphorus pentoxide (P₄O₁₀). The hot gas is hydrated by spraying with dilute phosphoric acid in a stainless steel absorption tower, producing concentrated phosphoric acid (75-85% H₃PO₄). The product is cooled, polished, and tested to meet food-grade specifications.
P₄O₁₀ + 6H₂O → 4H₃PO₄
Rohstoffe
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Elemental phosphorus (P₄) — Electric arc furnace reduction of phosphate rock (Reactant)
-
Air (O₂) — Atmosphere (Oxidant)
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Water (H₂O) — Purified water (Hydration medium)
Endprodukte
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Food-grade phosphoric acid (H₃PO₄) — Cola beverages, processed foods, pH adjustment (75-85% concentration, food-grade purity)
Environmental Impact
The thermal process is energy-intensive, requiring electricity for phosphorus production in electric arc furnaces. However, it produces minimal waste compared to the wet process, which generates large quantities of phosphogypsum. Fluorine emissions from phosphate rock require scrubbing.
Sicherheitshinweise
- ⚠ Elemental phosphorus is pyrophoric and highly toxic
- ⚠ Combustion at 1,500+ degrees C creates extreme burn hazards
- ⚠ Concentrated phosphoric acid is corrosive
- ⚠ Phosphine gas (PH₃) exposure risk during phosphorus handling — extremely toxic
Neuere Innovationen
Membrane purification of wet-process phosphoric acid is emerging as a lower-cost alternative to the thermal process for food-grade production.
Superphosphoric acid (105% H₃PO₄ equivalent) production for concentrated liquid fertilizers uses similar technology.
Produktionsmaßstab
2000000
Tonnen/Jahr
$3.8 billion
Marktwert
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