Ammonium bisulfite, also known as acidic ammonium bisulfite, is an inorganic chemical product with a molecular formula of h5no3s and a molecular weight of 99.1096. Sulfur dioxide is introduced into the ammonia or ammonium carbonate solution until the solution is acidic and no longer absorbs sulfur dioxide. The resulting solution is an ammonium bisulfite solution.

It is usually used as a preservative, reducing agent, and also used to make sulfur dioxide, sodium hydroxide, etc. In the field of water treatment, it can be used as a deoxidizer for boiler water, drilling mud, and closed-circuit water cooling. Prevent dissolved oxygen from corroding equipment. Especially suitable for small and medium-sized low-pressure boilers. In the drilling industry, adding ammonium bisulfite and crystalline Fe3O4 (as a catalyst) to drilling mud containing montmorillonite can effectively remove dissolved oxygen in the mud and prevent well pipe corrosion. In addition, ammonium bisulfite can be used to produce pure liquid sulfur dioxide, sodium bisulfite, sodium bisulfite, some dyes and drugs; it is a raw material for caprolactam production in synthetic fiber production; it is used in pulp and paper industries Pulping and bleaching.

In the field of water treatment, it can be used as a deoxidizer for boiler water, drilling mud and closed-circuit cooling water to prevent dissolved oxygen from corroding equipment. Ammonium bisulfite is a low-toxic compound. The concentrate is slightly irritating to the skin, but short-term contact will not cause damage. After contact with the solution, rinse with water for a while. The product itself has no fire and explosion hazard. In case of fire, you can extinguish it with water. Generally, it is harmless to water. Do not discharge materials into the surrounding environment without government permission. Storage should conform to specifications, and will not decompose in use and storage. It can react with acids and bases. It is easily oxidized in the air. When heated, it decomposes and releases sulfur dioxide. It is easily soluble in water and sublimates at 150°C. It is reductive and will slowly oxidize to sulfate in the air. Ammonium bisulfite solution has the odor of sulfur dioxide, which will decompose and release sulfur dioxide when it encounters acid.