The way and distinction of sodium tripolyphosphate I and II

sodium tripolyphosphate is divided into high temperature type [I] and low temperature type [II type] because of different generating temperatures. The difference lies in the difference of bond length and bond angle between the two and the six hydrate Na5P3O10. 6H2O after hydration of I and II products. Under the same condition, the heat of I type hydration is high, and it is easy to produce caking when dissolved in water. This is due to the presence of sodium ions of four coordination bodies in the I type structure, and the four coordination body has a strong affinity for water, and conversely, the II type produces six water at a very slow speed in water.