Process for decreasing the charge of chemical required in a chlo

Details Process for decreasing the charge of chemical required in a chlo Process for decreasing the charge of chemical required in a chlo

1990-06-26

1992-06-30

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 60, 162 89, D21C 902, D21C 912

Patent

active

051260093

ABSTRACT:
Disclosed is an improved chlorinated pulp bleaching process and apparatus which reduces caustic requirements significantly, wherein the washed chlorinated pulp, after first separating therefrom the effluent from the chlorination stage washing step, is treated with recycled alkaline extraction stage effluent in an additional washing step between the chlorination stage washing step and the extraction stage washing step; and wherein the effluent from the additional washing step is separated from the twice-washed pulp and, optionally wherein that effluent is recycled as shower water for the chlorination stage washing step, before the twice washed pulp is mixed with the caustic in the extraction stage.

REFERENCES:
patent: Re23868 (1954-09-01), Limerick
patent: 1683262 (1928-09-01), Richter et al.
patent: 2711359 (1955-06-01), Johansen
patent: 2745712 (1956-05-01), Burling et al.
patent: 4070234 (1978-01-01), Anderson et al.
patent: 4104114 (1978-08-01), Rowlandson et al.
patent: 4529479 (1985-07-01), Tuomi
patent: 4543155 (1985-09-01), Stawicki
Berry et al., "Papricycle", 1988 Pulping Conf. New Orleans, Oct. 30-Nov. 2, 1988.

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