A method for forming waste plastic and a method for thermal cracking thereof

The invention is directed to producing high-density pellets by molding waste plastic and to producing high-strength coke by mixing the pellets with coal and dry-distilling the mixture in a coke oven. As feedstock is used waste plastic that contains polyethylene, polypropylene and polystyrene, which...

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Bibliographische Detailangaben
Hauptverfasser:	IBARAKI, TETSUHARU, SATO, TAKASHI, SHIOZAWA, SYUUICHI, SAKATANI, MASATOSHI, HIROMATSU, TAKASHI, MORI, YASUHIKO, TOODA, YUUJI, KOSEKI, TSUNEO
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	CHEMISTRY DESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FORPRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS FUELS LUBRICANTS MAKING GRANULES OR PREFORMS METALLURGY PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS TECHNICAL GASES CONTAINING CARBON MONOXIDE TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The invention is directed to producing high-density pellets by molding waste plastic and to producing high-strength coke by mixing the pellets with coal and dry-distilling the mixture in a coke oven. As feedstock is used waste plastic that contains polyethylene, polypropylene and polystyrene, which are plastics that soften at a low temperature, at a total rate of 50% or greater. The waste plastic is molded using a molding method of extruding it from a nozzle of a screw-type stuffing machine. In the method of this invention, the waste plastic is heated to 180 - 260 °C in the molding machine and gas in the molding machine is sucked out. By this operation, the polyethylene, polypropylene and/or polystyrene are made molten and the amount of gas in the plastic is reduced. The plastic in this state is compression-molded by extrusion from a nozzle of 15 - 60 mm diameter. The plastic molding obtained is cut into chunks and cooled with a water cooler within 3 seconds after cutting.