Ammonium sulphate

Ammonium sulphate

Granule Ammonium sulphate

CAS号：7783-20-2

EINECS NO.：231-984-1

Molecular formula：(NH4)2SO4

Molecular weight：132.14

Melting point(℃)：230-280℃，Relative density(water equal 1)： 1.77,Relative vapor density(air equal 1)： 7.9 （In actual packaging, relative density is about 1.1-1.3）

Appearance and Features：The pure product is colorless orthorhomibc crystal, and the industrial product is white to light yellow crystal. Due to the differences of craft and raw material, the final product has gray, black, yellow, red, and other colors.

Chemical property：It can be decomposed at 235℃, soluble in water(acidic aqueous solution), and the PH value of 0.1mol/L aqueous solution is 5.5. Low toxicity and irritant. Insoluble in ethanol and acetone, with hygroscopicity, will become pieces after moisture absorption. When heated to above 513℃, it will fully decomposed into ammonia, nitrogen, sulfur dioxide and water. Ammonia gas is released by action with alkali. Reaction with barium chloride solution to form barium sulfate precipitation. It can also cause salting out of proteins.

Classification：Industrial grade (Caprolactam grade)、Iron and steel grade (coking grade)，Power plant by-products and other chemical by-products

Industrial grade (Caprolactam grade)

Color：white/off-white

Nitrogen： 21%Min

Moisture：0.5%Max

Sulphur：23%Min

Caprolactam by-product, raw material is synthesized from liquid ammonia and 98% ammonium sulphate. Because of the high quality of raw material, crystallized ammonium sulphate has less impurities, relatively high purity, white appearance and large particles. It mainly used for export and direct application. Because of its good particle size, it is convenient for farmers to apply directly, and it has a greater mechanized fertilization advantage and higher farmers recognition; due to its low impurities, it can be used in medical and food products.

Steel grade

Color：white/off-white

Nitrogen：20.5%Min

Moisture：1%Max

As the by-product ammonium sulphate of coking plant comes from coal distillation products, the impurity content is complex, most of them are powdery, farmers do not tend to purchase direct application, mainly used by compound fertilizer enterprises.

Package：Ammonium sulphate has different packages now, 50KG and container bags. There are also different packaging designed according to customer requirements, the customers needs is our requirements.(At present, the domestic standard package is 50KG/bags) Ammonium sulphate in coking plant is not standard.

Technical specification (China National Standard CGB535-1995)

ITEM	Special Grade	First Grade	Qualified
Appearance	White crystals, no visible mechanical impurities	no visible mechanical impurities	no visible mechanical impurities
Nitrogen（dry base）,% ≥	21.0	21.0	20.5
Moisture（H2O）,% ≤	0.2	0.3	1.0
Free Acid（H2SO4） , % ≤	0.03	0.05	0.20
Fe,% ≤	0.007	-	-
As，% ≤	0.00005	-	-
Heave metal（Pb），% ≤	0.005	-	-
Water Insoluble，% ≤	0.01	-	-

Note：The contents of iron, arsenic, heavy metals and water insoluble substances can not be tested when ammonium sulphate is used in agriculture.