Pulp Mill Chemicals


Sodium chlorate


Sodium chlorate(NaClO3) is an strong oxidising agent.When pure it is white crystalline powder readily soluble in water.It is hygroscopic. It decomposes above 250oC to release oxygen and leave sodium chloride.


It is a basic raw material used for generation of Chlorine Dioxide, which is an Oxidising Bleaching agent.
Chlorine dioxide is produced by a chemical reaction, in which sodium chlorate, sulfuric acid and sulfur dioxide are the reactants. Spent acid is obtained as a by-product with the release of heat. The spent acid is a sulfuric acidic solution of sodium sulfate that, quite often, can be utilized. The heat, on the other hand, has to be dissipated to maintain optimal conditions.

The chemical reaction could be summarized as follows: 2NaCIO3+H2SO4 +SO2  2ClO2 + 2 NaHSO4 + heat

The chlorine dioxide gas obtained in this way is collected from the reactor and washed before being absorbed in water and stored as an aqueous solution.

Bleaching Enzymes


• Bleaching Enzyme-Dynazyme-B is an enriched xylanase preparation which will selectively hydrolyse cellulose and hemicellulose thus helping in delignification.



  • Facilitates the bleaching of kraft, soda and sulfite pulps. Hydrolyzes the hemicellulose fraction in wood fibers, loosening the pulp structure, thereby enhancing lignin extraction, reducing chemical consumption, and attaining higher brightness in virgin pulp bleaching processes.
  • Enhances fiber strength, reduces refining energy requirements, and increases inter-fiber bonding through fibrillation while avoiding fiber breaking.
  • Smoothes pulps manufactured from tropical hardwoods reducing the vessel picking which occurs during printing. This is particularly important when manufacturing writing grade papers using eucalyptus pulps.
  • Eliminates cellulose fines that are present in some non-wood pulps such as sugar cane bagasse, bamboo, straws and grasses. Those fines unnecessarily consume bleaching chemicals, decrease paper strength properties and cause dusting problems during paper rolling and conversion.
  • Reduces AOX levels in the effluent thus reduces the BOD: COD ratio.





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