Freeze dried

Freeze-dried Powder

In the powdered coffee industry freeze drying of coffee extract is a widely used drying method which is considered as the best possible drying technique. Coffee extract is frozen and vacuum-dried at low temperatures resulting in an instant product with good aroma retention.
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Freeze drying gives high production cost due to high investment and operating cost. To reduce these cost it is economical to concentrate the coffee extract prior to drying. Conventional thermal concentration methods reduce the quality of the extract.

Freeze concentration costs are much lower than freeze drying. Consequently, pre-concentration with freeze concentration reduces the total production cost while the quality retention is maximal.

With the link below a more detailed process description can be viewed and/or downloaded that describes the application of freeze concentration in the cofee industry.