Process for recovering phthalic anhydride and hydrogen chloride from plastic materials
December 22, 2014. 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 preparing phthalic anhydride Polyvinyl chloride polymer compositions containing trizinc dimolybdate monohydrate and zinc phosphite for smoke suppression Use of zinc and copper (I) salts to reduce sulfur and nitrogen impurities during the pyrolysis of plastic and rubber waste to hydrocarbons Thermal process for the liquefaction of aromatic hydrocarbon oxidation residues and recovery of acetic acid Sequential pyrolysis of plastic to recover polystyrene HCL and terephthalic acid Method and apparatus for pyrolytically decomposing waste plastic Patent #: 5608136 InventorsAssigneeApplicationNo. 362270 filed on 12/22/1994US Classes:423/488, Recovery or purification549/250Purification or recoveryExaminersPrimary: Bos, StevenAttorney, Agent or FirmForeign Patent References
International ClassesC01B 007/07C07D 307/89 Foreign Application Priority Data1993-12-27 JPAbstractThere is provided a process to recover phthalic anhydride from a plastic material which contains a phthalate ester as a plasticizer comprising the steps of:(a) heating the plastic material so that the plastic material is gasified to produce a first product,(b) contacting the first product with alumina catalyst so that the product is catalytically cracked to produce a first catalytically cracked product comprising phthalic anhydride; and(c) recovering phthalic anhydride from the first catalytically cracked product.Other References
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