Process for the manufacture of low-phosphorus or phosphorus-free detergents containing aluminosilicates

摘要

A process for the manufacture of low-phosphorus or phorphorus-free spray dried detergents containing at least one water-soluble inorganic or organic compound exerting a washing or cleansing effect and at least one compound inhibiting alkaline earth metal ion precipitation comprising a finely-dispersed, water-insoluble, bound water-containing silicate compound having a calcium-binding power of at least 50 mg CaO/gm of anhydrous active substance and having the formula, combined water not shown, (M2/nO)x . Me2O3 . (SiO2)y where M is a cation of the valence n, exchangeable with calcium, x is a number of from 0.7 to 1.5, Me is a member selected from aluminum and boron and y is a number of from 0.8 to 6, comprising spraying an aqueous slurry containing at least 50% by weight of the total solids of the final spray dried detergent into a conventional spray drier and simultaneously injecting at the area of the spray cone at least 25% of the total amount of said bound water-containing silicate compound, as a powder.