Recycling waste cellulosic material with sodium sulphide digestion
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United States of America Patent
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Sep 15, 1992
Grant Date -
N/A
app pub date -
Mar 1, 1991
filing date -
Mar 1, 1991
priority date (Note) -
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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.
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