Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1996-02-20
1998-08-11
Silverman, Stanley S.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 50, 162DIG8, 204529, 205749, D21C 1100
Patent
active
057923159
ABSTRACT:
This invention is related to a process for producing pulp from a cellulosic starting material, wherein an aqueous process effluent is purified from metal impurity cations. This process comprises that the effluent is purified by an electro-chemical membrane treatment in an electrochemical membrane device comprising a unit cell through which an electric current is passed between an anode side and a cathode side of said cell, said cell comprising at least two ion permeable membranes forming between them at least one compartment, said effluent being fed into an effluent feed compartment in said cell, in which the effluent is purified by removing with the electric current metal impurity cations from the effluent through a cation selective membrane on the cathode side of said compartment, and withdrawing from said compartment the purified effluent. The purified effluent may be recirculated to the pulp mill process, e.g. as washing water.
REFERENCES:
patent: 5401362 (1995-03-01), Lindberg
patent: 5547542 (1996-08-01), Landfors
Gerald E. Maples, "BFR.TM.: A New Process Toward Bleach Plant Closure", Tappi Journal, vol. 77, No. 11, Nov. 1994.
European Search Report, dated Jan. 14, 1998.
Electrodialysis in Advanced Waste Water Treatmwnt, Desalination, 24 (1978), pp. 129-139.
Environmental Oriented Electrochemistry, Studies in environmental science; 59, pp. 495-533, Elsevier 1994.
Effluent Free electrolytic Regeneration of Ion-Exchange Resins, Strathmann and K. Kock, pp. 145-168.
Landfors Johan
Persson Christin
Eka Chemicals AB
Mancini Ralph J.
Nguyen Dean T.
Silverman Stanley S.
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