Removal of bitumen from waste paper

摘要

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.