Abstract: A fluidized-bed reactor for the oxychlorination of ethylene, oxygen and HCL, comprises a heat exchanger, having tube packets in the fluidized-bed for releasing the heat evolved from exothermic reaction to a heat-transfer medium in the tube packets, in particular to water/steam. The tube packets come into contact with water via a ring pipe and the steam being removed via a ring pipe to provide an economical solution with which expensive drilled passages are avoided, the calculation for ring pipes is facilitated and a large number of wall passages is dispensed with. This is achieved by the ring pipe being mounted as a collector or chamber directly on the reactor wall.