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ABSTRACT
Changes in composition of household washing detergents are reviewed, with emphasis on the importance of STPP
As by law or voluntary agreement the STPP content in detergents has dropped during the last years in some countries, it will be shown that the quality of the used phosphates is of great influence on the quality of the final product
In manufacturing detergents with low phosphate content it is important to use special STPP-types for every process
The process technology of the manufacture of phosphate-containing powdered detergents can be divided into processes in which the individual components are worked up Into agglomeration products (spray mixing plants) and processes In which the individual components are combined to form a slurry of several substances (spray drying plants).