Colorless crystal or white particles. Odorless. Above 280 ℃ decomposition. Solubility in water: 0 ℃ when 70.6g, 100 ℃ when 103.8g. Insoluble in ethanol and acetone. pH 0.1mol / L aqueous solution was 5.5. The relative density of 1.77. Refractive index of 1.521. Ammonium sulfate fertilizer is mainly used for a variety of soils and crops. It can also be used aspects of textile, leather, medicine and other fields.
Basic Information
Chinese name： Ammonium sulfate
Foreign name: Ammoniumsulfate
Aliases: Ammonium
Chemical formula
(NH4) 2SO₄
Relative molecular mass
132.14
Melting point (℃)
230-280 ℃
Relative density (water = 1)
1.77
Chemical Properties：
Pure colorless transparent orthorhombic crystalline, acidic aqueous solution. Insoluble in alcohol, acetone and ammonia. Hygroscopic solid block form after moisture absorption. Heated to 513 ℃ completely decomposed to ammonia, nitrogen, sulfur dioxide, and water. And alkali action with the release of ammonia. Reaction with barium chloride, barium sulfate precipitation. It can also make the protein occurs salting.
Role and purpose
An excellent fertilizer (commonly known fertilize the soil powder), for general soil and crops, foliage make vigorous growth, improve fruit quality and yield, enhance crop resistance to disasters can be used for basic fertilizer, top dressing fertilizer and seed. With salt metathesis reaction was carried manufacturing ammonium chloride, ammonium alum and aluminum sulfate to generate action, together with boric acid and other manufacturing refractory materials. Added to the plating solution to increase conductivity. Food is also a catalyst of caramel, fresh yeast production in cultured yeast nitrogen, acid dyes help dyes, leather deliming agent. In addition, for beer brewing, chemical reagents and battery production. An important role is also rare earth mining, mining ammonium sulfate as raw materials, the use of ion exchange in the form of the mineral soil in the rare earth exchanged out, and then collect leachate impurity removal, sedimentation, pressing, after burning Serve rare earth ore, exploration and production of each 1 tons of rare earth ore is about 12 tons of ammonium sulfate.
Use biological lot, used for protein purification process, since ammonium sulfate are inert substance, less prone to reaction with other biologically active substances that can protect the greatest degree of protein activity during purification, addition, ammonium sulfate soluble polar well, can form a high-salt environment, for protein precipitation and subsequent high salt purified preparation. The solubility of ammonium sulfate at zero and room temperature of 25 degrees is quite different, the following is the molar concentration of ammonium sulfate at a temperature of two different saturation.
