A rotatable turntable for vortexing reactants comprises a vortexing plate which is rotatable. The motor drives for vortexing and rotation are stationary such that simple mechanical and electrical connection relative to the peripheral supports and to the vortexing plate can be achieved. A vortexing work station located in alignment with the turntable operates in synchronism with the turntable. Reactants at any radial reactant station on the vortexing plate can be withdrawn from and located onto the turntable at any radial location when the turntable stops rotation. The radial position of the turntable in relation to the outside vortexing and non-vortexing periphery remains relatively aligned.
