Process and apparatus for converting liquid whey into powder
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United States of America Patent
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Apr 11, 2000
Grant Date -
N/A
app pub date -
Nov 24, 1998
filing date -
Mar 25, 1996
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Abstract
A process and an apparatus for converting liquid by-products, such as whey and permeates of whey, derived from cheese making processes into substantially free-flowing, non-caking powdery products. The process comprises the stages of vacuum evaporation of the whey to a solids content of 65-80%, crystallization of the whey concentrate and air drying the whey, wherein the main stream of initially cooled whey concentrate passing through stages of crystallization, is fed with a secondary and/or tertiary stream to be mixed with the main stream. The apparatus is provided with a secondary and/or a tertiary conduit for feeding a secondary and/or tertiary stream to the main stream in the main conduit connecting means for collection and pretreatment of whey, vacuum evaporation of the whey, crystallization of the whey concentrate and air drying the whey. The feeding of a secondary and/or tertiary stream reduces the sticky nature of whey, leading to whey that is more easy to handle during the processing, and resulting in less wear of the apparatus.
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