International Code of Oenological Practices

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partial evaporation under vacuum

II. Partial evaporation



Prescriptions to concentrate musts at a moderate temperature by evaporation of a portion of the water in the thermal exchanger under a high vacuum.




See the sheet on II.2.1.12 “Partial dehydration of musts”.



a)        Select a continuous, rather than a re-circulating, unit;

b)       The prescription concentrates all ingredients and should thus be limited to must justifying this technique and should not modify the type of wine produced;

c)        This prescription is not recommended for musts from grape varieties with significant free varieties of odour;

d)       A volume counter will measure the amount of water eliminated.


Recommendation of OIV: