Process for vacuum pyrolysis removal of polymers from various ob

Details Process for vacuum pyrolysis removal of polymers from various ob Process for vacuum pyrolysis removal of polymers from various ob

1978-09-18

1980-09-02

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

Including melting

134 19, 134 21, 134 38, B08B 704

Patent

active

042204801

ABSTRACT:
Polymeric organic compounds are pyrolyzed to remove them from objects by heating in a first vacuum chamber to render flowable such polymers as are fusible at a temperature below that at which appreciable degradation is initiated. The fused polymer drops by free fall from the first chamber to a second vacuum chamber through a conduit connecting the two without contacting any intervening structure. The second chamber is maintained at a substantially lower temperature, where the polymer resolidifies. Upon further heating, polymer remaining in the first chamber is volatilized and withdrawn from the chamber to a water mist scrubber where it is largely trapped. Remaining vapors in the scrubber are drawn through a vapor separator to a vent stack. After the combustible volatiles are removed from the first chamber, air is admitted into the chamber to oxidize any residual carbon ash, leaving only the inorganic residue which is easily removable from the objects or materials that were not affected by the pyrolysis action.

REFERENCES:
patent: 81164 (1868-08-01), Harmon et al.
patent: 3374117 (1968-03-01), Savage
patent: 3448509 (1969-06-01), O'Reilly
patent: 3923653 (1975-12-01), Lavins
patent: 4057438 (1977-11-01), Mainord
Biklen, SPE Journal, "Now: Remove Plastic Deposits from Extruder Parts the Modern Way," vol. 29 (No. 7), 1973, pp. 25-27.
Barthelemy, "Vacuum Pyrolysis of Polymer v. Pollution", SPE 33rd Tech. Conf., 1975, pp. 601-603.

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