C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/186
C01B 33/26 (2006.01) C01B 39/02 (2006.01) C11D 3/12 (2006.01)
Patent
CA 1117733
A B S T R A C T A method for the preparation of finely-divided, water-insoluble, aluminosilicate cation-exchangers with a narrow particle size spectra suitable for detergent formula- tions comprising: (1) agitating a water-dissolved alkali metal silicate at a temperature of from 55°C to 95°C. (2) mixing therewith at a temperature of from 55°C to 95°C over a period of from three seconds to five minutes with vigorous agitation, a water-dissolved alkali metal alum- inate, in the presence of an excess of alkali to give a suspension of a silicate compound containing bound water and having a calcium binding power, when measured at 22°C by the Calcium Binding Power Test method set out in the specification, of at least 50 mg CaO/gm of anhydrous active substance, and having the formula, bound water not shown, (M2O)08-1.3 . Al2O3 . (SiO2)1.75-2.0 wherein M represents an alkali metal, wherein said reac- tant solutions when mixed have a composition correspond- ing to the desired Al2O3 and SiO2 amounts of the above formula, with a ratio of from 3.2 to 4.4 mols M20/mol Al2O3 and a ratio of from 70 to 85 mols of water/mol Al2O3, (3) maintaining said silicate compound suspension after said mixing step is completed, for a period of from two to twenty minutes under the agitation and temperature con- ditions of said mixing step, (4) rapidly heating said silicate compound suspension at least 5°C above the temperature of said mixing step to a temperature of from 60°C to 100°C, (5) allowing said silicate compound suspension to crystallize at said elevated temperature of from 60°C to 100°C while agitating sufficiently to keep said suspension flowable, (6) adjusting said crystalline silicate compound suspension to a pH of below 12.5, and (7) recovering said crystalline silicate compound.
308064
Just Guenther
Peters Bernd W.
Wuest Willi
Deutsche Gold Und- Silber-Scheideanstalt Vormals Roessler
Henkel Kommanditgesellschaft Auf Aktien
Macrae & Co.
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