C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/384, 23/64
C01B 25/41 (2006.01) B01J 19/24 (2006.01) B01J 19/26 (2006.01)
Patent
CA 1217024
PROCESS AND APPARATUS FOR MAKING ALKALI METAL POLYPHOSPHATES ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making alkali metal polyphosphates, especially alkali metal triphosphates, To this end,the disclosure provides for an alkali metal phos- phate solution or suspension to be forced through at least one nozzle and for them to be sprayed inside a spray tower through a flame zone produced by a one or more burners arranged in annular fashion. More particularly, the disclo- sure provides for fine particulate alkali metal polyphos- phates, especially alkali metal triphosphates, to be addi- tionally introduced into the spray tower from above and for them to be regularly distributed across the spray region(s) of the nozzle(s) with formation of agglomerated products. The disclosure also relates to an apparatus for carry- ing out the process. The apparatus is comprised of a cylin- drical spray tower (1) having a tapered lower end (3) and being closed by means of a cover (2); a spray means (6) being passed centrally through the cover (2); a plurality of burners (11) and a solid matter feed means being passed through the cover concentrically with respect to the spray means (6) and so as to be spaced therefrom; and a bevelled issuing gas outlet (4) opening upwardly from the tapered end of the spray tower (1).
443300
Damman Ben
de Witte Paul
Scheffer Hans
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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