Abstract
A novel conversion process of PVC, that is, the production method of Cl-free high BTU gas via pyrolysis/gasification of waste plastics including PVC using Ca compound was proposed. In this process, waste plastics including PVC are pyrolyzed/gasifed with calcium compounds. The heat of reaction produced by the hydration and carbonization of calcium compounds is used to heat the sample up to the pyrolysis and gasification temperatures. It is not necessary to feed air or oxygen to provide a partial combustion. As the results, high BTU product gas is produced. A part of calcium compound is reacted with HCl emitted from PVC. In this study, the pyrolysis behavior of PVC was investigated in thermo-balance. The pyrolysis profile depended on the heating rate, slightly on the degree of polymerization and strongly on the metals included in the resin. The reactivity of Ca compound to HCl gas depended on the heat treatment temperature and the particle size. The gasification rate of the residue from the pyrolysis of PVC resin was affected by the metals included in the PVC resin. PVC can be decomposed by the heat of reaction produced via hydration and carbonization of calcium compounds. HCl emitted during pyrolysis of PVC was almost completely captured by Ca compound mixed.
