A deep understanding of the physicochemical properties of ammonium sulfate can assist various indust

Ammonium sulfate is a common inorganic ammonium salt with the chemical formula (NH₄)₂SO₄. It appears as colorless rhombohedral crystals or white particles in its normal state, with a uniform appearance and no significant odor. It is a widely used basic raw material in the chemical and agricultural industries. Pure products are white in color, while industrial products often exhibit a light yellow or light gray hue due to the presence of trace impurities. They have a dry texture and good fluidity. Its molecular structure is stable, and its physicochemical properties are mild under normal temperature and pressure, ensuring good storage stability and suitable for long-term regular storage and use.
From the perspective of physical properties, ammonium sulfate is easily soluble in water, with solubility increasing as water temperature rises. At 20℃, about 75 grams can be dissolved in every 100 grams of water, forming a transparent acidic solution with a pH value of approximately 5.5. This substance is insoluble in organic solvents such as ethanol and acetone, exhibits moderate moisture absorption, and is less prone to caking when the environmental humidity is low. However, it will slowly absorb moisture at higher humidity levels, resulting in slight solidification. This is a key point to consider in storage management. Its relative density is approximately 1.77, with a moderate bulk density, facilitating easy loading, unloading, and metering. It has a high melting point and begins to decompose slowly when heated to 100℃ in an open environment, gradually releasing ammonia and acidic substances at high temperatures.
In terms of chemical properties, ammonium sulfate is a strong acid-weak base salt. Its solution becomes acidic after hydrolysis. It exhibits good chemical stability under normal conditions, is resistant to oxidative deterioration, and is non-flammable. However, it reacts easily when in contact with alkaline substances, releasing ammonia gas and leading to nitrogen loss. Therefore, it should be avoided being stored or used together with alkaline materials such as lime and plant ash. When heated to above 280℃, it decomposes completely, producing ammonia gas, nitrogen gas, sulfur dioxide, and water. The decomposition process leaves no residual impurities, meeting the basic requirements of clean production.

The preparation process of ammonium sulfate is mature, primarily involving the neutralization reaction between ammonia and sulfuric acid. With stable raw material sources, it can be produced on a large scale and standardized, ensuring continuous market supply. With a nitrogen content of about 21% and a sulfur content of about 24%, it is a basic material that combines both nitrogen and sulfur nutrients. This characteristic makes it irreplaceable in both agricultural and industrial fields. A deep understanding of the physicochemical properties of ammonium sulfate can help various industries plan rational usage schemes, standardize storage and operation procedures, fully leverage its application value, and facilitate the smooth operation of related industries.