Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1982-04-26
1983-09-06
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 89, D21C 916
Patent
active
044027885
ABSTRACT:
In the bleaching of wood pulp using the conventional CEH sequence with subsequent oxidation stages, the third stage (H) is replaced by peroxide oxidation (P) to a brightness level of 35-50 GE. Final brightness levels of 70-88 GE are attained using no greater amounts of chemicals in the subsequent stages than are required in the conventional CEHDH process. The temperature in the P stage is between 120.degree. and 170.degree. F.
REFERENCES:
patent: 1998389 (1935-04-01), Scheller
patent: 2668095 (1954-02-01), Fennell
patent: 2779656 (1957-01-01), Fennell
patent: 2920011 (1960-01-01), Eilers, Jr.
Ambady Raman
Ferguson Hector
Kidd James R.
Paulose George
Champion International Corporation
Smith William F.
Sommer Evelyn M.
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