METHOD FOR SUBLIMATION DRYING OF FARM ANIMALS BLOOD Russian patent published in 2013 - IPC F26B5/06 A23J1/06 A23K1/04 

FIELD: food industry.

SUBSTANCE: stabilised blood is poured into a tray wherein liquid nitrogen is then poured. Liquid nitrogen starts boiling under atmospheric pressure; the boiling temperature is equal to 103±2°C. The boiling (freezing) process lasts no more than 5 minutes. Then the frozen object is placed into a sublimation drying chamber where the drying process is performed under a pressure of 100-500 Pa. The temperature in the chamber is maintained at a level of 20÷40°C. The drying process duration is equal to 10÷200 minutes.

EFFECT: liquid nitrogen usage reduces the duration of the process of dehydrated blood production which decreases the drying process prime cost; protein components of dried blood produced with liquid nitrogen usage are subjected to minor destruction than in other drying versions.