Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1993-12-15
1996-04-16
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 31, 162 35, D21C 1104
Patent
active
055079121
ABSTRACT:
There is disclosed a process of increasing efficiency in a kraft pulping process that utilizes initial, bulk, and final delignification steps, a recovery boiler, and a caustic treatment step, which allows production of a white liquor stream that is separated into a sulphide-lean and sulphide-rich streams.
REFERENCES:
patent: 3909344 (1975-09-01), Lukes
patent: 4299652 (1981-11-01), Masuno et al.
patent: 4302281 (1981-11-01), Ryham
patent: 4692209 (1987-09-01), Santen
Lundborg, S., "Ekonomisk amalys av kausticering vid lag styrka kombinerat med vitlutindustning (Economical analysis of causticizing at low strength combined with white liquor evaporation)", in Swedish, Proceedings of the Swedish Paper and Cellulose Engineers Association (SPCI) 2nd Causticizing Symposium, pp. 22-32, 1982.
Blackwell, B. R., et al., "Kraft dead load reduction by white liquor evaporation: Theoretical analysis of a proposed process", Pulp and Paper Canada 87:10 pp. T378-384, 1986.
Larsson, A., et al., "High concentration causticizing-possibilities and limitations", Preprints of the CPPA International Chemical Recovery Conference, Ottawa, pp. 145-149, 1989.
Johansson, B. and Teder, A., "Modified kraft processes-a way to reduced environmental influence and reduced energy consumption", Proceedings of the 2nd World Congress of Chemical Engineering, Montreal, pp. 235-242, 1981.
Hartler, N. and Olsson, L. A., "Hydrogen sulphide cooking-Part 1, first stage variables", Svensk Papperstidning 75:13, pp. 559-565, 1972.
Cox, L. A. and Worster, H. E., "A status report on MacMillan Bloedel's hydrogen sulphide-kraft pulping process", Pulp & Paper Magazine of Canada 73:9, pp. 106-109, 1972.
Andrews, E. K., Chang, H-m, Kirkman, A. G. and Eckert, R. C., "Extended delignification in kraft/oxygen pulping of softwood by treatment with sodium sulphide liquors", Japan TAPPI International Symposium on Wood Pulp Chemistry, pp. 177-182, 1982.
Kirkman, A. G., Andrews, E. K., Chang, H-m, "Impact on extended delignification using green liquor pre-treatments on kraft mill chemical and energy balances", AlChE Symposium Series 86, pp. 66-73, 1984.
Alvo Steven
Chernoff Vilhauer, McClung & Stenzel
H. A. Simons Ltd.
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