Patent ID: 8262851
Filing Date: 2012-09-11
Classification: D21C

Abstract:
1. An alkaline peroxide mechanical pulping process comprising the steps of: (a) preconditioning a lignocellulosic chip material by adding chemical stabilizers selected from the group consisting of diethylene triamine pentaacetic acid (DTPA), ethylene diamine tetraacetic acid (EDTA), nitrilotriacetic acid (NTA), silicate and MgSO (b) discharging the preconditioned lignocellulosic chip material from the digester without the use of a screw mechanism to a fiberizer, and mechanically breaking apart the preconditioned lignocellulosic material in the fiberizer to obtain a fiberized lignocellulosic material; (c) washing the fiberized lignocellulosic material, (d) feeding the washed fiberized lignocellulosic material to a high consistency refiner; (e) treating the washed and fiberized lignocellulosic material with alkali peroxide chemicals for a time and under conditions sufficient to obtain a pulp therefrom; (f) retaining the pulp in a high consistency tower for a time sufficient to allow chemical reactions to complete; and thereafter (g) transferring the pulp from the high consistency tower to downstream processes and recovering the pulp therefrom.