When waste plastics that include chlorine-containing plastics, such as polyvinyl chloride (PVC), are used for a blast furnace, a chlorine-containing gas generated during pyrolysis may corrode the equipment. Then, the melt process mixed with PVC, polyethylene, polypropylene, polystyrene, coal tar (HOB) and Fe₂O₃ as the antichlor agents were examined to stabilize chlorine that was detached from PVC to form iron chloride. After the melt process, these were hydrocracked to produce oil. The result that chlorine was stabilized by iron oxide and formed iron chloride on the melt process was confirmed and reported. Subsequently, the influence of iron chloride on the hydorcracking process was examined. The following results were obtained;
(1) FeCl₂ and FeCl₃ promote polymerization of the product, and chlorine, which is generated from FeCl₃ by pyrolysis, is distributed in the product.
(2) When Fe₂O₃ is added on the melt process excessively, the dispersion of chlorine can be controlled by Fe₂O₃ to fix chlorine generated from FeCl₃.
(3) However, it is necessary to remove the iron chloride before the hydrocracking process because they promote polymerization of the products.

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The object of this study is to experimentally evaluate a performance and exhaust emissions of a single cylinder, four stroke cycle, direct-injection type diesel engine with no modifications operating on gas oil, waste vegetable oils, waste animal fat from restaurant grease and rice oil methyl ester. To prevent the clogging of the injection nozzle, gas oil was used as fuel before and after the experiment by tested fuels. The combustion characteristics and emissions such as specific energy consumption, ignition delay, concentra-tions of NOx, CO, THC, particulate matter PM and smoke opacity are compared with those of JIS # 2 gas oil. The measurement results showed that the vegetable oil and animal fat produced lower amount of CO, smoke and PM at high load condition. Specially, animal fat offers a measurable reduction in NO_x concentration compared to JIS # 2 gas oil, while at the same time lowering, PM and smoke at high load condition. Also discussed are the usability of the fuel pre-heater to reduce the effect of the high viscosity of animal fat, as well as the validity of application to a treatment process of the waste food oil.

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