Recycling waste cellulosic material with sodium sulphide digesti

Details Recycling waste cellulosic material with sodium sulphide digesti Recycling waste cellulosic material with sodium sulphide digesti

1991-03-01

1992-09-15

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 8, 162 3011, D21C 502

Patent

active

051475030

ABSTRACT:
Waste cellulosic material, for example corrugated paperboard is cooked in an aqueous alkaline cooking liquor to produce a brownstock pulp having a kappa number lower than that of the waste material; combustion of organic materials in the brownstock washing liquor provides heat energy which can be recovered for use in the cooking process and residual inorganic chemicals of the liquor can be employed to prepare fresh cooking liquor; the recycled pulp can be employed as the sole pulp component of brown paper products, or can be bleached to provide a pulp for white paper products.

REFERENCES:
patent: 3425897 (1969-02-01), Murphy, Jr.
patent: 3440134 (1969-04-01), Murphy, Jr.
patent: 3884750 (1975-05-01), Iannazzi
patent: 4385997 (1983-05-01), Stradal
patent: 4737238 (1988-04-01), de Ruvo

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