In freeze drying, brewed coffee is frozen intro granules, which are then placed in vaccum chamber, where the water sublimates, which gives the best of aroma and taste. And it’s possible for coffee blend only, Chicory blend is impossible. Freeze-drying, where the liquid is forced from the frozen coffee through chemical sublimation. This process forces the ice to vaporize without going through the liquid stage. In the case of instant coffee, this leaves behind a shelf-stable coffee powder that can then be reconstituted in water. In freeze-drying, the coffee extract is frozen to about – 40°C and cut into granules. The frozen granules are then dried at low temperature and under vacuum.