Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1973-08-01
1976-03-16
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
423207, D21C 1114
Patent
active
039444627
ABSTRACT:
The liquid phase coking of waste kraft pulping liquors can be effected with a shorter residence time in the coking means at lower temperature, and lower pressure by reducing the pH of such liquors by at least one pH unit before coking. Products are lower in malodorous organic sulfur components than those produced at a higher pH.
The lowering of the pH is achieved by adding sulfur dioxide to the liquor either as free SO.sub.2 or as an aqueous solution of SO.sub.2.
REFERENCES:
patent: 2752243 (1956-06-01), Barton et al.
patent: 3272739 (1966-09-01), Earle et al.
patent: 3595806 (1971-07-01), Prahacs et al.
patent: 3607619 (1971-09-01), Hess et al.
patent: 3649534 (1972-03-01), Schotte
patent: 3654071 (1972-04-01), Brannland et al.
patent: 3717545 (1973-02-01), Hess et al.
patent: 3836427 (1974-09-01), Cole et al.
Cole Edward L.
Franz William F.
Hess Howard V.
Archer Henry W.
Bashore S. Leon
Ries C. G.
Smith William F.
Texaco Inc.
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