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GLYCERIN USP, PH.EUR. is actually obtained from two types of industries: – Chemical plants producing oil fatty acids, where the basic process is the splitting of the oil to obtain fatty acid and glycerine. – Plants producing biodiesel, where the basic process is the esterification of oil to obtain oil ester and glycerine. Glycerine thus obtained must be concentrated and distilled in a vacuum to obtain the desired glycerol concentration.