Four stage alkaline peroxide mechanical pulping

Details Four stage alkaline peroxide mechanical pulping Four stage alkaline peroxide mechanical pulping

D - Textiles, Paper

21

C

D21C 9/16 (2006.01)

Patent

CA 2450464

An alkaline peroxide mechanical pulping process includes a pretreatment including pressing the lignocellulosic material and impregnating the lignocellulosic material with a first alkaline peroxide pretreatment solution, and maintaining the impregnation for a first reaction time. The lignocellulosic material impregnated with the first pretreatment solution can then be fed to a refiner having an inlet and a rotating disc within a casing, and an alkaline peroxide refiner solution can be added to the lignocellulosic material as it fed to the refiner. The refiner solution and the lignocellulosic material can be mixed as the material is refined to a primary pulp. The primary pulp can be delivered from the refiner casing to a high consistency tower, and can be retained in the tower to produce bleached primary pulp. The bleached primary pulp can be further processed to a secondary pulp.

La présente invention concerne un procédé d'application de produits chimiques, tels qu'un prétraitement (1) au peroxyde alcalin sur la matière lignocellulosique avant raffinage chimique (3) et au niveau du raffineur principal. Dans un mode de réalisation préféré, ledit procédé consiste à (i) préconditionner la matière première à des températures qui se situent au-dessous de 95 DEG C, notamment au-dessous de 80 DEG C, (ii) limiter le temps et/ou la température dans le raffineur, (iii) refroidir rapidement pour maintenir les températures au-dessous de 80 DEG C, et (iv) blanchir (4) à haute densité de manière subséquente.

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