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1 Polish Journal of Chemical Technology

1 2009

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A chemical method of the production of "heavy" sodium tripolyphosphate with the high content of Form I or Form II

Banach M., Kowalski Z., Wzorek Z., Gorazda K.

Polish Journal of Chemical Technology

2009

Vol. 11, nr 2

13-20

Sodium tripolyphosphate STPP is used in laundry detergent as a detergent "builder". The paper presents the chemical method of obtaining "heavy", i.e. with higher bulk density granulated sodium tripolyphosphate. The bulk density of sodium tripolyphosphate was increased by preparing a mixture of the dried sodium phosphates, the recycled subgrain of STPP and water in specific proportions and calcining this mixture for 1 hour at 400°C and 550°C (to obtain a proper STPP form) in the chamber kiln. This method allows producing the granular sodium tripolyphosphate with high bulk density (1.04-1.07 kg/dm3) and a high content of Form I or Form II, respectively.