Method of reducing the energy consumption at the refining of cel

Details Method of reducing the energy consumption at the refining of cel Method of reducing the energy consumption at the refining of cel

1989-05-02

1991-04-16

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Simultaneous mechanical defibration and chemical treatment

162 90, D21B 116

Patent

active

050079859

ABSTRACT:
Method of reducing the energy consumption at the refining/beating of cellulose-containing material by the addition of alkali to the material for neutralizing acid groups bonded to the fibre wall. According to the invention, the pH-value in the pulp suspension is measured at the refiner outlet, the alkali is added in an amount depending on the measured pH value for neutralization without excess in the beating zone or immediately before the material enters the same, in an amount of 0.05-9 kg/ton, preferably 0.5-5 kg/ton, suitably 1-4 kg/ton, calculated as NaOH.

REFERENCES:
patent: 3013932 (1961-12-01), Hinrichs
patent: 3023140 (1962-02-01), Textor
patent: 3055792 (1962-09-01), Kueppen et al.
patent: 3597310 (1971-08-01), Sumi
patent: 3627629 (1971-12-01), Miller
patent: 4599138 (1986-07-01), Lindahl

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