C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
134/16
C11D 1/00 (2006.01) C11D 3/00 (2006.01) C11D 3/08 (2006.01) C11D 3/33 (2006.01) C11D 10/00 (2006.01)
Patent
CA 1042306
ABSTRACT Gelation and/or precipitation which normally result from the ad- mixing of alkali metal silicates and alkali metal hydroxy-alkyl iminodiacet- ates in aqueous media at elevated temperatures are prevented by raising the pH of the aqueous solution of alkali metal hydroxyalkyl iminodiacetate to 12.5 or more before admixing with the alkali metal silicate. The process described makes a homogeneous mixture of the components and allows the production of a crutcher mix which does not block lines or spray nozzle orifices in the production of spray dried detergent compositions. The preferred silicate is sodium silicate of an Na2O:SiO2 ratio of 1:2 to 1:2.4, the preferred imino- diacetate is disodium 2-hydroxyethyl iminodiacetate and a preferred compound for adjusting the pH is sodium carbonate, all of which are useful in the production of built non-phasphate heavy duty synthetic organic detergent compositions.
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