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A Study on Physical Dechlorination of Mixed Plastics using Screw Reactor  

Kim Sang-Guk (Korea Institute of Energy Research)
Eom Yujin (Korea Institute of Energy Research)
Chung Soo-Hyun (Korea Institute of Energy Research)
Publication Information
Resources Recycling / v.15, no.1, 2006 , pp. 20-27 More about this Journal
Abstract
PVC is the thermoplastic offering excellent material properties. PVC has been used in wide variety of applications, however, it causes environmental problems when it is discarded because of its high chlorine content. Since dechlorination reaction of PVC is taking place at relatively low temperature compared to the pyrolysis temperature of plastics, study on the dechlorination reaction has been carried out as a pre-treatment process. Twin screw reactor which shows excellent mixing capabilities is employed. Experimental variables are the first and second reactor temperature, PVC content in mixed plastics, viscosity of mixed plastics, feeding rate, rotational speed or the second reactor. Over $90\%$ of dechlorination ratio can be obtained under proper operation conditions. Chlorine gas evolved from reactor is absorbed in water and can be recovered as a hydrochloric acid. Analysis had been done on chlorine flows by taking material balance over realtor.
Keywords
PVC; screw reactor; mixed plastics; dechlorination ratio;
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