The two are completely different chemicals.
The similarities are: both are polyphosphates (one is sodium salt and the other is potassium salt). Generally, only chemical reactions involving polyphosphate are required, and both can be used. In industry, the choice is based on the cost of the two raw materials and the requirements for downstream by-products.
Usually sodium pyrophosphate is used in a wider range of applications, such as water treatment, printing and dyeing, bleaching, cleaning, degreasing, etc. Potassium pyrophosphate is commonly used in electroplating.
Potassium pyrophosphate has all the properties of other polymeric phosphates, similar to sodium pyrophosphate, but has greater solubility and can chelate with alkaline earth metals and heavy metal ions; it can chelate with Ca2+ and Mg2+ in hard water Forms stable complexes from plastic elastomers to soften hard water, improve washing ability, and remove dirt. It can also form a protective film on the surface of iron, lead, zinc, aluminum and other metals; the silicone coating additive pyrophosphate ion (P2O74-) has a strong dispersing ability for finely dispersed solids and can promote fine and trace substances. uniform mixing. High-purity, low-iron potassium pyrophosphate has stable pH buffering ability and can maintain the pH value of the solution for a long time.
