Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1984-08-06
1985-10-29
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 79, 162 83, D21C 900
Patent
active
045499292
ABSTRACT:
Wood pulps, particularly sulphonate pulps, such as jack pine ultra-high-yield pulps produced by sulphonation, are readily discolored by metal ions commonly found in paper mills. Additions of 0.001 to 2% on pulp dry basis of tin ions, especially derived from stannous compounds, to wood pulps effectively brighten the pulps at ambient temperature.
Metal ions such as ferrous, ferric, cupric, aluminum, nickel and manganese are common discoloring ions and pulps containing these ions can be brightened by the addition of tin ions particularly derived from stannous chloride, stannous sulphate, stannous tartrate, stannous oxolate, stannic chloride and stannic sulphate, the tin ions as Sn.sup.+2 being added in an amount to provide a ratio of stannous ions to discoloring metal ions up to about 2:1, preferably about 1.5:1.
REFERENCES:
patent: 3929558 (1975-12-01), Shaw
patent: 4247362 (1981-01-01), Williams
patent: 4410397 (1983-10-01), Kempf
Fairchild Raymond S.
Tay Ching-Hua
Abitibi-Price Inc.
Delbridge Robert F.
Fors Arne I.
Smith William F.
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