Sulfanilic acid is an inorganic solid acid formed when the hydroxyl group of sulfuric acid is replaced by an amino group. The chemical formula is NH2SO3H and the molecular weight is 97.09. It is generally a white, odorless oblique-square sheet crystal with a relative density of 2.126 and a melting point of 205℃. It is soluble in water and liquid ammonia. It's relatively stable. [1] The aqueous solution of sulfamic acid has the same strong acidity as hydrochloric acid and sulfuric acid, so it is also called solid sulfuric acid, which has the characteristics of non-volatilization, no odor and little toxicity to the human body.

The vacuum drum filter is used in the process of solid-liquid separation. The contact material of the filter material is plastic (PP), resistant to the temperature of 600C and the corrosion of concentrated sulfuric acid on the PH value of 3. It has the characteristics of simple operation, no cleaning, low liquid content of filter cake, fast filtering speed, etc. Our factory has been praised by users in this project.