Abstract: The invention relates to contact-making between a gas phase, at least one liquid phase, and at least one comminuted solid phase.The process uses a cell or compartment provided with at least one deflecting means such as the sloping wall 3 designed to impart an overall circulatory motion to the solid phase and with gas phase distributor 1, supplying this compartment with solid products, supplying this compartment with a liquid phase so as to cover entirely the solid when at rest, and feeding the compartment with the gas phase through the distributor 1 for the purpose of generating in said compartment a periodic pulsing stage consisting of gas-phase decompressions and layer contractions.The invention permits achieving an intimate contact between three distinct phases for the purpose of transfer(s) or of reaction(s) between these phases.

Abstract: The invention concerns a process and a device for roasting an agro-food product in the form of grains.The process consists of fluidizing an auxiliary body in the form of fine solid particles in an enclosure 1, and putting the grains of the product to be roasted in flotation in the fluidized bed of particles of which the temperature is adapted to roasting, to generate the roasting by the effect of the shocks of the fine particles of the auxiliary body with the grains of the product.The invention can be applied particularly for the roasting of grains of a product such as coffee, cocoa, etc.