By definition, delactosed whey is a product where much of the lactose has been removed from the whey by concentration/evaporation
of liquid whey to approx. 60 % solids followed by a gradual cooling of the whey concentrate in crystallization tanks
, where the lactose will crystallize. The crystallized product is then passed through decanters
where the lactose crystals are separated and washed, ready for drying
. The delactosed whey or mother liquor typically contains 1/3 amorphous lactose, 1/3 salts, and 1/3 whey proteins, and is dried as described in mother liquor.