Make-up liquor and black liquor evaporating process during pulp

Details Make-up liquor and black liquor evaporating process during pulp Make-up liquor and black liquor evaporating process during pulp

1989-09-18

1992-02-18

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 47, 159 473, B01D 126, D21C 1106, D21C 1110

Patent

active

050890875

ABSTRACT:
The number 2 flash tank of a black liquor energy recovery system associated with a continuous pulp digester is eliminated, and other advantages are obtained. After flashing in the number 1 flash tank, concentrated black liquor passes to a multiple effect evaporator system as the heating fluid supplied to the last effect. The heated black liquor passes in heat exchange relationship with excess make-up liquor from the high pressure feeder circulation system and/or with portions of the extracted black liquor that have had more of their content removed, the heated black liquor effecting evaporation of the excess make-up liquor and/or portions of the black liquor. Steam from the steam relief of the steaming vessel may be used as a secondary heating fluid source for the first effect.

REFERENCES:
patent: 2942657 (1960-06-01), Kleinschmidt
patent: 4401516 (1983-08-01), Olson et al.
patent: 4756797 (1988-07-01), Elmore et al.

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