Recovery of chemicals from pulp waste liquor

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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Details

162 3011, 162 31, 423DIG3, D21C 1112, D21C 1100

Patent

active

046922091

ABSTRACT:
The invention relates to the recovery of chemicals from waste liquor from wood pulp process, primarily black liquor, while utilizing energy liberated. Controlled total vaporization of the pulp waste liquor at high temperature and low oxygen potential is achieved by the external supply of energy. During the subsequent condensation and separation of melt or water solution is obtained which, without causticizing, can be used for the preparation of white liquor, and also an energy rich gas and mainly free from sulphur, consisting primarily of carbon monoxide and hydrogen.

REFERENCES:
patent: 2574193 (1951-11-01), Savell
patent: 3867251 (1975-02-01), Holme
patent: 4244779 (1981-01-01), Nieminen et al.
patent: 4253911 (1981-03-01), Hillstoom et al.
patent: 4351252 (1982-09-01), Shindome et al.
patent: 4601786 (1986-07-01), Santen et al.

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