Method of bleaching paper pulp by blending chlorine with a flow

Details Method of bleaching paper pulp by blending chlorine with a flow Method of bleaching paper pulp by blending chlorine with a flow

1983-08-15

1985-05-07

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With agitation or forced circulation

162 66, 261 76, 366107, B01F 304, D21C 912

Patent

active

045156557

ABSTRACT:
Gaseous chlorine is blended with a paper pulp slurry flow stream for pulp bleaching by mixing the chlorine with a larger quantity of steam prior to blending the chlorine/steam gas mixture with bleach washer filtrate which serves as carrier water for a multiplied number of gas bubbles entrained in the filtrate. As the cooler filtrate water extracts heat from the mixed gas bubble, the steam constituent condenses to collapse each bubble to a fraction of the original volume thereby providing a larger number of smaller chlorine bubbles than otherwise available from conventional phase mixing injectors.
The mixed phase flow stream of chlorine and filtrate is thereafter blended with the pulp slurry flow stream by shear induced turbulence resulting from a greater injection velocity of the mixed phase stream into the center of the slower moving slurry stream.

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