| Abstract: | Waste polyvinyl chloride (PVC), which is used as oil substitute in blast furnaces, contains a large amount of chlorine. In the case of pyrolyzing PVC, it produces hydrochloric gas (HCl) which can damage plant equipment and pollute the environment. Hence it must be de‐chlorinated before it is injected into the blast furnace. This paper studied the treatment of off gas in the de‐chlorination process of PVC, and its influence on the environment. The results showed that a multi‐stage absorption system for HCl could recover up to 10% of the hydrochloric acid, which could then be used directly in galvanizing processes. It also reduced the emission of HCl to 0.0066 ~ 0.0068 mg/m3, which is far less than the 0.030 mg/m3 allowed by the national environmental standard 1]. |
