Study on Chlorine Removal from Mixture of Waste Plastics

Abstract

The recycling of waste plastics that include chlorine-containing plastics, such as polyvinyl chloride, is difficult because that cause the equipment corrosion. Then, the dechlorination method of waste plastics containing chlorine (CCWP) that consists of the melt process and the hot water process of CCWP mixed with coal tar (HOB) and converter dust (CD) as the antichlor agents was examined. The following results were obtained;
(1) Iron oxide of the principal element of CD combines with chlorine eliminated from CCWP, so that it forms the water-soluble iron chloride on the melt process.
(2) HOB both promotes the pyrolysis reaction of CCWP and catches chlorine eliminated from CCWP on the melt process.
(3) About 80% of chlorine included in CCWP forms iron chloride, but about 40% of that cannot be removed because HOB catches them on the melt process.
(4) Iron chloride caught by HOB can be extracted on the hot water process.