Sulfuric acid is one of the important products of the basic chemical industry. It is not only a raw material for many chemical products, but also widely used in other sectors of the national economy. Its applications keep expanding with increasing demand for it. In the chemical industry, it is mainly used to produce chemical fertilizers as well as inorganic salts, organic raw materials, plastics, synthetic materials, pigments, pesticides and dye intermediates, etc. In the national economy, it is applied in industries of textile, metallurgy, refinement of petroleum products, additives, pharmaceuticals, national defense industry, etc.