Sodium Sulfite, Commercial, Anhydrous is an economical chemical for the sulfite pulping of wood in manufacturing various grades of paper. It is also a source for sodium sulfide used in Kraft pulping.
Sodium Sulfite is oxidized to sodium sulfate and is used to remove oxygen from boiler feed water. It should be considered for applications in which oxygen dissolved in water may increase equipment corrosion, e.g. process cooling water in chemical and allied industries, and in oil well drilling equipment.
Sodium Sulfite reacts with formaldehyde to form nonvolatile products. It has been suggested as a scavenger for free formaldehyde in urea-formaldehyde resins used for foam insulation, plywood, and particle board. Sodium Sulfate has also been used to neutralize leather tanning solutions, thereby increasing the chrome penetration and chrome concentration in leathers.