In chemical synthesis, in the purification of aldheydes and ketones, as catalyst, in the production of sulphonates, pesticides and herbicides, etc.
In textile and pulp & paper industry: as bleaching agent, and for removing of excess of chlorine and peroxides.
In pulp mills in the production of sulphite pulp.
In drilling water (oil extracting industry), as oxygen scavenger.
In steam boiler treatment to remove dissolved oxygen and to decrease metal contaminants (mainly copper).