a fluid distributing apparatus comprises a series of annular conduits positioned concentrically and close to a region for mixing or performing a reaction . each annular conduit has a plurality of orifices associated therewith which are spaced circumferentially and symmetrically proximate to the region and each orifice is positioned to deliver a liquid stream to the region . a feed line connects with a plurality of branch lines , each branch line connecting with one of the annular conduits . valves in the lines control the flow of liquid to the annular conduits . the conduits in the series are arranged for use in the method of the invention in a sequence , beginning with the conduit of greatest flow resistance when the feed rate is low and continuing successively with the conduits of lower flow resistance as the fixed rate increases . the resulting uniform flow rates through the orifices and avoidance of back flow contribute to high yield and quality of product .