Sodium aluminate → Sodium aluminosilicate

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Reaction Steps

According to batch size, gel composition and contents of sodium silicate, sodium aluminate solution is prepared. This is added at a controlled rate and at ambient temperature to sodium silicate solution taken previously in a stainless steel reactor. Slurry of reaction mixture is allowed to crystallize at temperature 70-100° C. for 1 to 5 hours until Zeolite-A formation takes place. Zeolite-A slurry is filtered and washed till filtrate pH was ˜11 to 10.5. Wet cake thus obtained is dried in a dryer and dry powder was pulverized and subjected to analysis. The comparison of the properties of detergent builder Zeolite-A produced according to present invention (Example 10) and SASIL (Degussa-Henkel) is given in Table 1.

Provenance & Evidence