C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
134/20, 23/64
C01B 25/41 (2006.01) C11D 3/06 (2006.01)
Patent
CA 1207978
ABSTRACT A sodium tripolyphosphate having a high rate of hydration, is produced by the steps of a) preparing a solution of mono and disodic sodium orthophosphates having an overall molar Na/P ratio of from 1.64 to 1.70; b) forming a spinning flow configuration with a hot gaseous phase with a high degree of momentum; c) introducing the orthophosphates solution prepared in step a) into said depression region of the spinning flow configuration so as to cause dispersion and thermal treatment of said orthophosphates solution by the gaseous phase, thereby to produce tripolyphosphate; and d) subjecting the product obtained in step c) to a complementary thermal treatment. The complementary thermal treatment may be effected in a continuous mode over a period of from 0.5 to 10 seconds, or in a discontinuous mode over a period of from 1 to 60 minutes. The treatment recited in step c) is effected at a temperature of from 300 to 450°C, and that in the treatment recited in step d) effected at a temperature of from 400 to 500°C. The sodium tripolyphosphate produced has an ROH at 1 minute >90°C, preferably at least equal to 95°C.
433179
Couffin Frederic
Magnier Claude
Rhone-Poulenc Chimie de Base
Smart & Biggar
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