Method and apparatus for thermal cracking of waste plastics

Details Method and apparatus for thermal cracking of waste plastics Method and apparatus for thermal cracking of waste plastics

1995-03-29

1998-04-14

Bennett, Henry A.

Furnaces

Process

Incinerating refuse

110345, 110229, 585241, 208120, 208 67, F23G 500

Patent

active

057380252

ABSTRACT:
Undermelted waste plastics which have not been completely melted from the exterior of a thermal cracking vessel is introduced into a container provided in an upper position within said thermal cracking vessel and having a net-like opening, allowing the plastics to melt within said container, allowing the resulting plastic melt to drop into the thermal cracking vessel through said net-like opening, the plastic melt is thermally cracked within the thermal cracking vessel. The resulting vaporous products is introduced into a fractional distillation column to separate high-boiling products from harmful gases, non-condensable hydrocarbon gases and low-boiling products, the harmful gases, non-condensable hydrocarbon gases and low-boiling products is introduced into a halogen-containing incinerator, while re-heating the high-boiling products, a portion of the re-heated high-boiling products is recycled to said thermal cracking vessel, the remaining portion is introduced into a zeolite catalyst bed for catalytic conversion, and the residue resulting from the thermal cracking of the waste plastics in the thermal cracking step is withdrawn from the lower portion of the thermal cracking vessel.

REFERENCES:
patent: 3904483 (1975-09-01), Kurihara et al.
patent: 4175211 (1979-11-01), Chen et al.
patent: 4851601 (1989-07-01), Fukuda et al.

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