Tetrapotassium pyrophosphate
General Product Information
| Article | Tetrapotassium pyrophosphate |
| Synonyms | Potassium pyrophosphate, Tetrapotassium diphosphate |
| CAS No. | 7320-34-5 |
| EEG No. | – |
| EINECS No. | 230-785-7 |
| IMO | – |
| Tariff Code | 28352400 |
| UN No. | – |
| VLG/ADR | – |
Description
Tetrapotassium pyrophosphate is the potassium salt of pyrophosphoric acid and belongs to the group of pyrophosphates. It is a white, crystalline powder that is excellently soluble in water and forms a slightly alkaline solution. This inorganic salt is valued for its effective chelating properties, where it can bind metal ions, and its ability to stabilize pH. These properties make it suitable for a variety of industrial applications.
Characteristics
- Odor: Odorless.
- Hygroscopic: Yes.
- Color: White.
- Grade: Technical.
- Solubility: Soluble in water.
- Shape: Crystalline powder.
Physical & Chemical Properties
| Chemical Structure | K4P2O7 |
| Molar Weight | 174.18 g/mol |
| Melting Point | Approx. 880 °C (decomposes). |
| Boiling Point | – |
| Density | – |
| Refractive Index | – |
| pH | Approx. 9-10 |
Applications
Tetrapotassium pyrophosphate is applied in various ways, for instance:
1. Water Treatment
Used as a sequestering agent to bind metal ions and prevent scale formation in water pipes and industrial plants.
2. Textile Industry
For improving color fastness and removing metal ions during washing.
3. Metal Industry
At surface treatment, rust prevention and as a component in cleaning agents.
Interessing Links
- CAS Common Chemistry – Potassium pyrophosphate
- European Chemicals Agency (ECHA) – For chemical information and regulations.
- PubChem – Tetrapotassium Pyrophosphate – Chemical information by the National Library of Medicine of the National Center for Biotechnology Information (NIH-NCBI).
- Wikipedia – Tetrapotassium pyrophosphate