Oxygen alkali detackification in secondary fiber recovery
AssigneeAir Products and Chemicals, Inc.
InventorsRonald C. Naddeo, Konstantinos Hristofas, Vincent L. Magnotta
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Abstract
A method is disclosed for the detackification of stickies in the production of recycled paper products containing secondary fibers. Oxygen is used to reduce the tackiness of stickies in secondary pulps, and optionally is used with alkali and/or detackification agents for optimum stickies control. The preferred alkali source is fully oxidized white liquor.
Claims9
A method for treating a secondary pulp comprising cellulosic fibers and tacky contaminants, wherein said pulp is prepared from waste paper material, said method comprising contacting said pulp in an aqueous liquid containing only fully oxidized white liquor as a source of alkali with oxygen gas at conditions of temperature, oxygen partial pressure, and contact time sufficient to decrease the tackiness of said tacky contaminants, thereby reducing operating and product quality problems caused by said tacky contaminants during further processing of said cellulosic fibers to yield a recycled paper product.
Dependencies are inferred from the claim text.