Method and apparatus for preparing a so-called non-caking powder
AssigneeStork Friesland B.V.
InventorGerrit George Kamphuis
Life of this patent
Estimating the term…
Abstract
Method and plant for preparing a non-caking powder by spray-drying a mixture of a concentrate of minimally 48% dry substance, such that in an uninterrupted drying operation the mixture is passed through the so-called sticky-zone, after which a subsequent cooling, rewetting and crystallization is performed, the latter three operations remaining spaced from said sticky-zone.
Claims5
A method for preparing a non-caking powder from a concentrate comprising spray-drying a concentrate having a minimum dry solids content of 48% at a temperature above 60.degree. to form a powder having a moisture content below that at which crystallization is possible, cooling the powder to a temperature below 35.degree. C., remoistening the cooled powder in a separate space to a moisture content at which crystallization is possible, allowing the remoistened powder to recrystallize and then drying the recrystallized powder to a final desired moisture content.
An apparatus for preparing a non-caking powder from a liquid comprising a spray-dry tower having an inlet for the liquid and an outlet for dried powder, an intermediate dryer and cooler positioned to receive the dried powder from the spray-dry tower outlet, a remoisturizer for remoistening the cooled powder, means for transferring the cooled powder from said intermediate dryer and cooler to said remoisturizer, a device positioned to receive the remoistened powder from the remoisturizer for crystallization and an after-dryer positioned to receive the crystallized powder for final drying.
Dependencies are inferred from the claim text.