Method of reducing scaling of heat transfer surfaces in an evapo

Details Method of reducing scaling of heat transfer surfaces in an evapo Method of reducing scaling of heat transfer surfaces in an evapo

1995-10-13

1997-07-15

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 48, D21C 1104

Patent

active

056479557

ABSTRACT:
Method of reducing scaling of heat transfer surfaces in an evaporation plant of a sulphate cellulose mill when sulphate cellulose is manufactured. In the method, ash to be fed into black liquor is mixed thereto after soap separation when the dry solids content of the black liquor is so low that sodium sulphate and other soluble salts contained in the ash dissolve in the black liquor completely.

REFERENCES:
patent: 4909899 (1990-03-01), Kuskila
patent: 5112441 (1992-05-01), Ruohola et al.
Gary A. Smook, "Handbook for Pulp & Paper Tech", 2nd Edition, 1992, pp. 133-140.
Offical Action issued in the Finnish priority application No. 944996 (dated 16, Jun. 1995).
Robert. Hedrick and John S. Kent-- "Crystallizing Sodium Salts From Black Liquor"; Dec. 1992 Tappi Journal (pp. 107-111).

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