Removal of bitumen from waste paper

Details Removal of bitumen from waste paper Removal of bitumen from waste paper

1978-07-27

1980-09-23

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 8, D21B 132

Patent

active

042241022

ABSTRACT:
In the recycling of wastepaper, paper products containing significant quantities of bitumen are treated to remove the bitumen prior to manufacture of new cellulosic products from the recycled stock. The process involves heating the reslushed wastepaper stock in the presence of a hydrophobic (plastic) material at a temperature greater than the softening point of the bitumen. During the heating, the system is agitated and a surface active agent is optionally added. The hydrophobic material takes up the bitumen and is separated from the wastepaper stock.

REFERENCES:
patent: 2959513 (1960-11-01), Savage
patent: 4013505 (1977-03-01), Balcar et al.
patent: 4076578 (1978-02-01), Puddington et al.
Condensed Chemical Dictionary, 8th Ed. VanNostrand NY, NY 1974, p. 936, 118.

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