Model: | MOS7778-80-5 |
Brand Name: | MOSINTER |
CAS No.: | 7778-80-5 |
Melting point: | 1067°C |
Boiling point: | 1689°C |
Density: | 2.66 |
Storage condition: | Store at RT. |
Soluble: | 110 g/L (20 ºC) |
Flashing point: | 1689°C |
Solubility: | H2O: 0.5 M at 20 °C, clear, colorless |
Stability: | Stable. |
Potassium Sulphate (CAS: 7778-80-5)
Item | Index |
Appearance | Colorless or white hexagonal or rhombic crystal or granular powder |
Relative density | 2.662 |
Inversion point | 588°C |
Melting point | 1069°C |
Boiling point | 1689°C |
Potassium sulfate (K2SO4) (in British English potassium sulphate, also called sulphate of potash,
arcanite, or archaically known as potash of sulfur) is a non-flammable white crystalline
salt which is soluble in water. Thechemical is commonly used in fertilizers, providing both potassium and sulfur.
Manufacture
The process for manufacturing potassium sulfate is similar to that used for the manufacture of sodium sulfate.
Potassium sulfate can be synthesised by reaction of potassium chloride with sulfuric acid according to the Leblancprocess.
Potassium sulfate is produced according to the following reaction:
2 KCl + H2SO4 → 2 HCl + K2SO4
The Hargreaves process uses sulfur dioxide, oxygen and water and potassium chloride as the starting materials to produce
potassium sulfate. Hydrochloric acid evaporates off. SO2 is produced through the burning of sulfur.
Properties
The anhydrous crystals form a double six-sided pyramid, but are in fact classified as rhombic. They are transparent, very hard and have a bitter, salty taste. The salt is
soluble in water, but insoluble in solutions of potassium hydroxide (sp. gr. 1.35), or in absolute ethanol. It melts at 1,067 °C (1,953 °F).
Uses
The principal use of potassium sulfate is as a fertilizer. K2SO4 does not contain chloride, which can be harmful to some crops.
Potassium sulfate is preferred for these crops, which include tobacco and some fruits and vegetables. Crops that are less sensitive
may still require potassium sulfate for optimal growth if the soil accumulates chloride from irrigation water.
The crude salt is also used occasionally in the manufacture of glass. Potassium sulfate is also used as a flash reducer in artillery
propellant charges. It reduces muzzle flash, flareback and blast overpressure.
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