CO-COKING OF COAL WITH PITCHES AND WASTE PLASTICS

Liquid-phase co-thermolysis of waste plastics (e.g. polystyrene, polyc arbonate, polyurethane, polyvinyl chloride, tire rubber, unsaturated p olyester resin, melamine-phenol formaldehyde resin, polyethylene, poly amide, polyethylene terephthalate, phenol formaldehyde resin) with coa l-tar pitch at temperatures up to 400 degrees C yielded gases, pyrolys is oils, and high-melting pitches (reaction pitches). Thermogravimetri c analysis of these pitches showed that they were thermally stable up to the plastic temperature range of coals. Hence, the reaction pitches could be used as reactive additives for weak-coking coals to improve their coking properties. (C) 1997 Elsevier Science B.V.