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US 5,292,862 AGranted
Method for the pyrolysis of polymers
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsEigo Miura, Takashi Yamanaka, Ryoji Ohori, Akio Ohdaira, Kenichi Nishiwaki, Yoshikuni Itoh, Yoshinori Morita, Hajime Inagaki
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Abstract
The method includes the steps of feeding a polymer to an extruder where the polymer is melted, metering the molten polymer from the extruder to a tubular pyrolysis reactor through metering means connected to the extruder, and pyrolytically decomposing the polymer in the tubular pyrolysis reactor in the presence of a higher fatty acid, and/or a hydrochloric acid acceptor.
Claims9
A method for the pyrolysis of an olefin polymer for producing a pyrolytic wax comprising the steps of:
- feeding an olefin to an extruder where the polymer is melted,
- metering the molten polymer from the extruder to a tubular pyrolysis reactor through a gear pump connected to the extruder;
- pyrolytically decomposing the polymer in the tubular pyrolysis reactor in the presence of a higher fatty acid, a hydrochloric acid acceptor or a mixture thereof, to produce low molecular weight polymers;
- introducing the low molecular weight polymers from the tubular pyrolysis reactor into an evaporator while adjusting the temperature in the evaporator to about 250.degree. to 430.degree. C., and causing evaporation of the volatile components in the evaporator while blowing an inert gas into the evaporator with the low molecular weight polymers;
- and
- withdrawing volatile components separated from the low molecular weight polymers from the evaporator.
3 more elements
Dependencies are inferred from the claim text.