Method and apparatus for pyrolytically decomposing waste plastic
March 3, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3829558 Method of hygienic disposal of chlorine-containing plastic material Removal of chlorine from pyrolytic oils Process for the reprocessing of carbon containing wastes Controlled catalystic and thermal sequential pyrolysis and hydrolysis of polycarbonate and plastic waste to recover monomers Monomer recovery from polymeric materials Reducing nitrogen oxides emissions by dual fuel firing of a turbine Sludge dispersing agent for fuel oil and fuel oil composition containing the same Process for recovering phthalic anhydride and hydrogen chloride from plastic materials Patent #: 5686055 Inventors
ApplicationNo. 033921 filed on 03/03/1998US Classes:585/240PRODUCTION OF HYDROCARBON MIXTURE FROM REFUSE OR VEGETATIONExaminersPrimary: Griffin, Steven P.Assistant: Hendrickson, Stuart L. Attorney, Agent or FirmForeign Patent References
International ClassC10B 057/00Foreign Application Priority Data1991-12-20 JPAbstractDisclosed is a method and apparatus for pyrolytically decomposing waste plastic which may contain halogen-containing polymer such as PVC. The plastic is heated at 270° to 350° C., whereby a plasticizer contained in the plastic material is decomposed and vaporized, and a chlorine-containing polymer is dechlorinated to produce hydrogen chloride. The vaporized decomposition matter and the hydrogen chloride are removed from the plastic, and the vaporized decomposition matter is separated from the hydrogen chloride. Then isolated plastic is further heated to 450° C. or higher to produce a pyrolysis product. Alternatively, the former heating step is divided into two steps of: heating at a temperature lower than 270° C., whereby a plasticizer is decomposed; and heating to 270° to 350° C., whereby a chlorine-containing polymer contained in the plastic material is dechlorinated. Accordingly, the decomposition matter of plasticizer and hydrogen chloride are separately removed from the plastic. |
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