Calcium bisulfite

Calcium bisulfite (CAS 13780-03-5), also known by its food additive designation E227, is an inorganic sulfite salt supplied primarily as an aqueous solution.

Where is Calcium bisulfite used?

• Food and beverage: preservative, antioxidant and bleaching agent controlling microbial growth and oxidative browning in wines, fruit juices and dried fruits
• Pulp and paper: active cooking liquor component in sulfite pulping, breaking down lignin to liberate cellulose fibers
• Wood pulp treatment: bleaching agent improving brightness without chlorine-based conditions
• In water treatment it serves as a dechlorination agent, neutralizing residual chlorine in municipal and industrial effluent streams.

Commercial specifications

• Aqueous solution, typically 6% to 15% active SO₂ equivalent