Causticizing process

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

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162 35, 423165, 423183, 423432, 423 64D, 423641, 423DIG3, D21C 1112

Patent

active

047625902

ABSTRACT:
The invention concerns a causticizing procedure by which from soda liquor derived from a sulphate cellulose digesting process and from unslaked lime is produced white liquor for reuse in the digesting process, over lime slaking and a subsequent causticizing reaction proper. It is essential in the invention that the lime slaking is carried out using white liquor, whereafter the causticizing reaction proper is allowed to take place between the slaked lime and soda liquor combined therewith. The requisite white liquor is obtained by recirculating part of the white liquor produced by the causticizing process, to the slaking step, where it either completely or partially replaces the soda liquor employed in prior art. By using white liquor, one avoids the foaming, interfering with the process, which is encountered in the slaking step.

REFERENCES:
patent: 1691511 (1928-11-01), Bates
patent: 1743080 (1930-01-01), Bradley et al.
patent: 2552183 (1951-05-01), Knight
patent: 2979380 (1961-04-01), Miller
patent: 3194638 (1965-07-01), Neuville
patent: 3210235 (1965-10-01), Ferrigan et al.
patent: 3414468 (1968-12-01), Copeland
patent: 4093508 (1978-06-01), Henricson
patent: 4159922 (1979-07-01), Cosper
patent: 4302281 (1981-11-01), Ryham

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