CATALYTIC CRACKER FOR SYNTHETIC POLYMER AND PRODUCTION OF OILY MATERIAL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide both a catalytic cracker capable of adding a cracking promoting catalyst to a waste plastic contained in a municipal refuse or an industrial waste, etc., as a main object and catalytically cracking the waste plastic and a method for converting a synthetic polymer into an oil by continuously melting and catalytically cracking the waste plastic in the catalytic cracker and thereby producing and recovering a cracked oil in high yield. SOLUTION: This catalytic cracker for a synthetic polymer comprises an extruder 1→a tubular preheater 2→a tubular cracking furnace 3→a receiver 4 as a main line. The extruder 1 is equipped with a full-flighted screw and the tubular preheater 2 is provided with a heater 23 and a static mixer. The tubular cracking furnace 3 is equipped with a heater 33 and a scraper and a screw 31 and both the tubular preheater 2 and the tubular cracking furnace 3 are in a tilted arrangement with an outlet located at a high level. The polymer which is a cracking raw material is melt kneaded in the extruder 1, heated up with the tubular preheater 2 under stirring and then catalytically cracked in the coexistence of an amorphous silica-alumina catalyst at 300-470 deg.C for 15min overall residence time in the tubular cracking furnace 3. The oil recovery ratio for an oily material is 80% based on the weight of the charged raw material plastic and the viscosity of the produced oily material is <=120cSt (at 80 deg.C) by continuously cracking a mixture of 85 pts.wt. polypropylene(PP) with 5 pts.wt. polyethylene(PE) and 10 pts.wt. polystyrene(PS) at 440 deg.C.