METHOD AND CHEMICAL COMPOSITION FOR IMPROVING EFFICIENCY OF PRODUCING MECHANICAL PULP Russian patent published in 2014 - IPC D21C1/06 

FIELD: chemistry.

SUBSTANCE: invention discloses a composition and a method which enhance the process of mechanically producing pulp from starting materials. The composition is fed into the paper production process not later than the completion of mechanical production of pulp from wood chips. The composition contains: a base selected from magnesium hydroxide or magnesium hydroxide in a combination with sodium hydroxide, a reducing agent selected from a group comprising water-soluble hydrosulphites, dithionites, sulphites, bisulphites, metabisulphites, borohydrides and any combination thereof, and a chelating agent which is an amino carboxylic acid salt. The method of enhancing the mechanical pulping process includes adding the composition to cellulose material until the completion of the mechanical pulping process, followed by bleaching said pulp with hydrogen peroxide or sodium hydrosulphite.

EFFECT: low power consumption and high efficiency of subsequent bleaching processes.

21 cl, 18 tbl