Sugar Double Sulphitation is a widely used clarification process in Indian sugar mills to produce white plantation sugar. It involves treating raw sugarcane juice with sulfur dioxide and lime at two distinct stages—first on raw juice and again on the syrup—to remove impurities, bleach the juice, and enhance the white color of the crystals.
Key Details of the Double Sulphitation Process:
- Purpose: Primarily acts as a bleaching agent and aids in the purification/clarification of cane juice, creating high-purity, white sugar crystals.
- The Process:
- First Sulphitation: Raw juice is continuously limed and treated with SO2 gas in a reaction tank, forming insoluble calcium sulphite which helps remove colloidal impurities.
- Second Sulphitation: Un-sulphured syrup from the evaporator is again sulphited (sometimes called syrup sulphitation) to achieve better color and clarity.
- Products: Produces white sugar, often graded as M-31, which is commonly used in consumer retail, beverage, and confectionery industries.
- Comparison: Compared to the carbonation process, it is more efficient in removing colour, though it produces sugar that may have higher sulphur content than sulphitation-free methods.
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