Potassium pyrosulfate Chemical Properties

Melting point:

325 °C

Density 

2.28 g/mL at 25 °C (lit.)

bulk density

830kg/m3

storage temp. 

no restrictions.

solubility 

H₂O: 0.1 M at 20 °C, clear, colorless

form 

Solid

Specific Gravity

2.28

color 

White

PH

0.8 (50g/l, H2O, 20℃)

Odor

Odorless

PH Range

1 - 2 at 25.5 g/l at 25 °C

Water Solubility 

MAY DECOMPOSE

Sensitive 

Hygroscopic

Merck 

14,7664

Stability:

Stable. Incompatible with strong acids, strong bases.

CAS DataBase Reference

7790-62-7(CAS DataBase Reference)

EPA Substance Registry System

Disulfuric acid, dipotassium salt (7790-62-7)

Safety Information

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 3260 8/PG 2

WGK Germany 

3

TSCA 

TSCA listed

HS Code 

2833 29 80

HazardClass 

8

PackingGroup 

II

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

Potassium pyrosulfate Usage And Synthesis

Chemical Properties

Potassium pyrosulphate, also known as potassium disulfate, appears as colorless needles or as a white crystalline powder or fused pieces. It is soluble in water, converting to potassium bisulfate. Specifically, it dissolves in cold water but decomposes in hot water to form potassium sulfate. It melts below 300 °C and decomposes at higher temperatures. This compound exhibits strong oxidizing properties and can form sulfates through eutectic fusion with certain metal oxides that are insoluble in water and acids.

Uses

Potassium disulfite supported on silica may be used for the synthesis of ethyl pyruvate.

Uses

Potassium disulfate (K₂S₂O₇) can be used:

• As a salt catalyst for the conversion of hemicellulose into reducing sugars such as xylose and galactose by mechanocatalysis .
• In the preparation of diacylbenzenes via Pd-catalyzed decarboxylative acylation of aromatic ketones with oxocarboxylic acids.
• As an oxidant for the preparation of monosubstituted triazoles from aryl azides and propargyl alcohol using Ag₂O as a catalyst.

Uses

Acid flux in analysis, laboratory reagent.

Preparation

Potassium pyrosulphate is obtained by heating potassium hydrogen sulphate to its melting point.

General Description

Potassium disulfite (Potassium pyrosulfate) has been synthesized from potassium hydrogen sulfate, via melting.

Flammability and Explosibility

Non flammable

References

[1] P.J. MINEELY   S. A T. Molten potassium pyrosulfate: The reactions of seven metal oxalates[J]. Thermochimica Acta, 1987, 114 2: Pages 281-286. DOI:10.1016/0040-6031(87)80049-7.
[2] CHUNBIN GUO. A novel perspective process for alumina extraction from coal fly ash via potassium pyrosulfate calcination activation method[J]. Journal of Cleaner Production, 2020, 271 1: 122703. DOI:10.1016/j.jclepro.2020.122703.

Potassium pyrosulfate(7790-62-7)Related Product Information

• Ferrous sulfate
• Potassium chloride
• Losartan potassium
• Potassium sorbate
• Potassium iodide
• Potassium Acetate
• Potassium persulfate
• Potassium sulfate
• POTASSIUM METABISULFITE
• Potassium
• POTASSIUM CYANIDE
• Sulfuric acid
• POTASSIUM PYROSULFATE
• Potassium hydroxide
• POTASSIUM HYDROGEN SULFITE
• Potassium pyrosulfate
• Compound fertilizer of potassium sulfate