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.
Type:
Grant
Filed:
January 12, 1976
Date of Patent:
August 9, 1977
Assignee:
Cerro Corporation
Inventors:
Frank W. Eggers, III, Ralph O. Wigger, Richard L. Coan
Abstract: A heat detecting conductor embodied in a flat tape wherein conductive strips in an open circuit are separated, at acceptable temperatures, by thermoplastic insulating material which is adapted to melt at predetermined elevated temperatures and to permit the conductive strips to come into contact with each other, thereby closing the electric circuit and actuating an audible and/or visual alarm. The heat detecting conductor may be associated with a cable carrying one or more service lines or with a cable connected to one or more heat detecting devices, as a back-up therefor, or may be used alone.
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.
Type:
Grant
Filed:
January 2, 1974
Date of Patent:
January 13, 1976
Assignee:
Cerro Corporation
Inventors:
Frank W. Eggers, III, Ralph O. Wigger, Richard L. Coan