What are the common purification methods used in transforming crude glycerin into food-grade glycerin?
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Common purification methods used in transforming crude glycerin into food-grade glycerin include the use of ion exchange resins and activated carbon . Ion exchange resins, specifically cationite resins, are effective in removing impurities such as sulphur and nitrogen compounds from distilled glycerin . The addition of water to crude glycerin enhances the removal of saponifiable matter, such as fatty acid methyl esters and free fatty acids, through solvent extraction using hexane or biodiesel . Activated carbon is also used for purification, with thermal regeneration being an optimal method for restoring its adsorption capacity . Other purification methods mentioned include filtration, phosphoric acid treatment, and heat treatment . These methods aim to remove impurities and improve the quality of crude glycerin for various applications, including the food industry.
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