METHOD FOR PURIFYING THE GLYCERIN FROM BIO-DIESEL PLANT

摘要

A method for purifying glycerin is provided to produce glycerine with purity 99.5% at high efficiency and low cost, to reduce defects of product to 30% or more, and to prevent pyrolysis of hydrocarbon-based components. A method for purifying glycerin of low purity which is by-products produced in a biodiesel plant comprises the steps of: treating a soap component among raw materials with acid or alkali to neutralize the soap component; evaporating light material with lower boiling point than the glycerine component by a spray type distillation method; and distilling the glycerine at a high temperature of 180~250 °C under vacuum.