Removing chlorine-containing insulation with a fluidized medium

Details Removing chlorine-containing insulation with a fluidized medium Removing chlorine-containing insulation with a fluidized medium

1976-01-12

1977-08-09

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

134 18, 134 19, 134 25R, 134 32, B08B 704, B08B 1500

Patent

active

040408655

ABSTRACT:
This application describes a continuous method of removing polyvinyl chloride insulation or other volatilizable material from items such as copper wire without producing undesirable by-products. The method involves the pyrolysis of the insulation on the wire in a fluidized bed reactor charged with small particles of calcium carbonate. The calcium carbonate reacts with the gaseous chlorine from the insulation to produce calcium chloride which then is collected and can be used for snow removal, road construction, and the like. After removal of the insulation, the copper wire is cooled and cleaned. The products of combustion are passed through an afterburner to a HCl scrubber containing CaCO.sub.3 where any remaining chlorine is reacted with calcium carbonate to produce CaCl.sub.2. The application also describes apparatus for moving the items across the heated reactor. An alternative process involves pyrolysis of the insulation in a pyrolysis chamber, passing the products of pyrolysis through an afterburner and thence to a fluidized bed reactor which uses fluidized particles of CaCO.sub.3 to remove any chlorine from the products of combustion of the afterburner. An HCl scrubber is also used as a final processing step in this form of the process to remove particulate matter and to prevent HCl emissions in the event of a system failure.

REFERENCES:
patent: 2774661 (1956-12-01), White
patent: 3139726 (1964-07-01), Wilson et al.
patent: 3250643 (1966-05-01), Sergent
patent: 3346417 (1967-10-01), Ehrlich
patent: 3480477 (1969-11-01), Levin

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