Alkaline sulfite pulping process with sodium aluminate and anthr

Details Alkaline sulfite pulping process with sodium aluminate and anthr Alkaline sulfite pulping process with sodium aluminate and anthr

1981-05-04

1983-05-24

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 79, 162 83, D21C 320

Patent

active

043849210

ABSTRACT:
An alkaline sulfite pulping process in which the lignocellulosic material is cooked in a solution containing sodium sulfite is provided. Sodium aluminate is used as a buffering agent. As a result of this, the stability of the pH of the cook and the properties of the pulp are improved. The amount of sodium aluminate as NaOH is from 2% to 8% based on the dry weight of the chips. The pulping process is carried out with the addition of a small dosage of anthraquinone, to produce chemically defibered pulps.

REFERENCES:
patent: 1935580 (1933-11-01), Richter
patent: 2601110 (1952-06-01), Fisher et al.
patent: 4213821 (1980-07-01), Vanderhoek et al.
patent: 4218284 (1980-08-01), Hultman et al.
Svensk Papperstidning, 73 (1970) 5, pp. 122-133.
Paperi ja Puu, (61/1979), pp. 685-700.

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