Patent ID: 8092772

Claim:
A method for manufacturing granular sodium percarbonate in a fluidized bed reactor, comprising: adding an aqueous hydrogen peroxide solution to said reactor through a central tube of a nozzle, adding an aqueous sodium carbonate solution to said reactor through an inner jacket tube arranged coaxially around said central tube and through a threaded ring slot arranged between the central tube and the first jacket tube, wherein the threads of the ring slot are arranged at an angle α with respect of the direction of the longitudinal axis of the central tube, and adding a protective gas to said reactor through an outer jacket tube arranged coaxially around the central tube and inner jacket tube, wherein the aqueous sodium carbonate solution is formed into droplets mainly by a centrifugal force induced by the swirling motion of the carbonate solution achieved by the threaded ring slot, and wherein said protective gas is added through the outer jacket tube at a pressure of less than 0.7 bar.