Flash Reactor and Drier has heating temperature up to 300 ° C and the flash configuration can be atmospheric, under vacuum, under controlled/ inert atmosphere. The Reactor and Drier has short process time of 1/ 10 minute, evaporation capacity of 50/ 3000 kg/h, residual humidity down to 0.1%, heating temperature up to 300 ° C and granulometric range of 5/ 3000 micron. The Reactor and Drier find application in chemical and pharmaceutical industries. The Reactor and Drier can reach high temperature differences without deterioration of the item and elevated coefficient of thermal exchange due to conduction through the stator hot wall and convection through preheated flow of air or gas. The Reactor and Drier has dynamic thin layer centrifugal drier-granulator. The Flash Reactor and Drier can be used for mixing, reaction, drying and granulation.