PROCESS FOR PREPARING NATRIUM PHOSPHATES, ESPECIALLY NATRIUM POLYPHOSPHATES, WITH SOLUTIONS OR SUSPENSIONS OF NATRIUM PHOSPHATES

摘要

The disclosure relates to a process for making alkali metal phosphates, especially alkali metal polyphosphates, from alkali metal phosphate solutions or suspensions. To this end the solutions or suspensions are forced to flow through a plurality of single opening nozzle structures under a pressure of 6 to 66 bars and sprayed inside a tower through a flame zone produced by a plurality of burners arranged in annular fashion. The disclosure also relates to a device for carrying out the process, wherein a cylindrical spray tower (1) having a tapered lower end and being closed by means of a cover (2) has a solvent feed pipe (5) terminating in a spray means (6) centrally passed through the cover, and wherein a plurality of burners is passed through the cover (2), concentrically around the solvent feed pipe (5). The spray means (6) is comprised of a feed pipe (15) and at least one spray head (12), which has a plurality of single opening nozzle structures (17) disposed in its terminal surface area (13). At least one pressure-increasing pump ( 7) is disposed in the solvent feed pipe (5).