Milchsäureproduktion zur Lebensmittelkonservierung
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Das natürliche Konservierungsmittel der fermentierten Lebensmittelrevolution
Übersicht
Lactic acid is produced commercially by fermentation of glucose or sucrose using Lactobacillus species, serving as a food preservative, acidulant, and the monomer for biodegradable polylactic acid (PLA) plastic. The fermentation process produces optically pure L-(+)-lactic acid or D-(-)-lactic acid depending on the bacterial strain, which is critical for PLA polymer properties. Traditional food applications include yogurt, sauerkraut, and pickled vegetables, while the growing PLA market drives new capacity.
Chemischer Prozess
Lactobacillus delbrueckii or L. rhamnosus is fermented on glucose at 40-45 degrees C with continuous neutralization using Ca(OH)₂ or NaOH to maintain pH 5.5-6.0 for 2-4 days. The broth is filtered, acidified to convert calcium lactate back to free lactic acid, and purified by activated carbon treatment, ion exchange, and vacuum distillation or molecular distillation.
Rohstoffe
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Glucose or sucrose — Corn wet milling or sugar refining (Carbon source)
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Lactobacillus delbrueckii — Culture propagation (Fermenting organism)
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Calcium hydroxide (Ca(OH)₂) — Lime kiln (pH control agent)
Endprodukte
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L-(+)-Lactic acid (C₃H₆O₃) — Food preservative, PLA monomer, pharmaceutical (Food-grade 80-88% concentration, >99% optical purity)
Environmental Impact
Fermentative lactic acid production from renewable sugars has a lower carbon footprint than chemical synthesis from petroleum-derived acetaldehyde. Calcium sulfate (gypsum) waste from the traditional recovery process is a disposal challenge. Newer electrodialysis and membrane-based recovery methods eliminate gypsum waste entirely.
Sicherheitshinweise
- ⚠ Concentrated lactic acid (>80%) is corrosive to skin and eyes
- ⚠ Calcium hydroxide dust is caustic
- ⚠ Fermentation CO₂ release in enclosed spaces
- ⚠ Hot distillation equipment presents burn hazards
Neuere Innovationen
Direct electrodialysis recovery of lactic acid from fermentation broth eliminates the need for lime and sulfuric acid, reducing waste by 80%.
Engineered yeast strains tolerant to low pH enable fermentation without continuous neutralization, simplifying downstream processing.
Produktionsmaßstab
1200000
Tonnen/Jahr
$3.0 billion
Marktwert
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