Potassium pyrosulfate (K₂S₂O₇) is an inorganic compound commonly used as a dehydrating agent and desiccant. It is a white solid that is highly hygroscopic and can absorb moisture from the air to form aqueous crystals. 

Potassium pyrosulfate has a wide range of industrial applications, such as in the manufacture of sulfuric acid, fertilizers, dyes, pigments, glass, ceramics, paper, etc.

1. Dehydrating agent and desiccant: Potassium pyrosulfate is highly hygroscopic and can be used to remove water from certain chemicals, or as a desiccant to protect other substances from moisture.

2. Fertilizer production: Potassium pyrosulfate can be used as a potash fertilizer to provide the potassium needed for plant growth.

3. Glass and ceramic industry: Potassium pyrosulfate can be used as a flux at high temperatures to reduce the melting point of glass and ceramics and improve production efficiency.

4. Paper industry: Potassium pyrosulfate can be used as an additive in the paper industry to help remove impurities in the paper and improve the whiteness and strength of the paper.

5. Dye and pigment manufacturing: Potassium pyrosulfate is used as a catalyst or medium in the production process of dyes and pigments, helping to improve the quality of the product.

6. Organic synthesis: Potassium pyrosulfate is used as a catalyst or dehydrating agent in organic chemistry and is involved in esterification, dehydration, and other types of reactions.

7. Metal refining and refining: Potassium pyrosulfate can be used as an aid in the refining and refining process of certain metals to help remove impurities.

8. Water treatment: Potassium pyrosulfate can be used as a water treatment agent to purify water quality and remove pollutants from water.

9. Analytical Chemistry: In the laboratory, potassium pyrosulfate can be used as a reagent for certain chemical analysis tests.