A process for purifying glycerin derived from obtaining
biodiesel is described, the process comprising acidifying glycerin. Feeding the
glycerin to an electro dialysis unit comprising at least one exchange membrane
and at least one anion exchange membrane separated. Where the Glycerin
purification is fed into the diluted compartment and in the
concentrated compartment a NaCl solution
apply a potential difference so that the ions present in the glycerin
migrate through the anionic and exchange membranes from the diluted
compartments to the concentrated compartments. The purity of the glycerin and a
stable quality are very important in the production of for applications ranging
from chemical.
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