Raffinage et Cristallisation du Sucre
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Conversion de la canne à sucre brute en cristaux de saccharose pur
Aperçu
Sugar refining transforms raw cane or beet sugar into refined white sucrose through a series of dissolution, purification, and recrystallization steps. The process removes color bodies, minerals, and organic impurities to produce >99.9% pure sucrose crystals. Global production exceeds 180 million tons annually, with Brazil and India as the largest producers. The process represents one of the oldest and largest-scale purification operations in the food industry.
Procédé chimique
Raw sugar is dissolved in hot water to form a syrup (~65 Brix), then purified by carbonatation (adding lime and CO₂) or phosphatation to remove impurities. The clarified liquor is decolorized through activated carbon or ion exchange, concentrated by multi-effect evaporation, and crystallized in vacuum pans under controlled conditions.
C₁₂H₂₂O₁₁ (dissolved, supersaturated) → C₁₂H₂₂O₁₁ (crystals) (crystallization)
Matières premières
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Raw cane sugar (C₁₂H₂₂O₁₁) — Sugar mills crushing sugarcane (Crude sucrose)
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Calcium hydroxide (Ca(OH)₂) — Lime kiln (Clarification agent)
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Carbon dioxide (CO₂) — Lime kiln flue gas (Carbonatation agent)
Produits finis
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Refined white sugar (sucrose) — Food ingredient and sweetener (>99.9% purity, ICUMSA 45)
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Molasses — Animal feed, fermentation substrate, rum production (Byproduct containing residual sugars and minerals)
Environmental Impact
Sugar refining uses large quantities of water and energy for evaporation. Bagasse (sugarcane fiber) is burned as biomass fuel, making many sugar mills energy self-sufficient. Wastewater with high BOD requires treatment. Modern mills achieve near-zero discharge by recycling washwater.
Considérations de sécurité
- ⚠ Sugar dust is explosive at concentrations above 45 g/m³
- ⚠ Hot sugar syrup (80+ degrees C) causes severe burns
- ⚠ Lime handling requires eye and skin protection
- ⚠ Confined space hazards in evaporators and crystallizers
Innovations récentes
Membrane filtration (nanofiltration and ultrafiltration) is being adopted for syrup clarification, reducing chemical usage.
Continuous centrifugal crystallization improves energy efficiency.
Some mills co-produce bioethanol from molasses.
Échelle de production
180000000
tonnes/an
$45 billion
valeur marchande
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