สำนักราชบัณฑิตยสภา

The Journal of the Royal Institute of Thailand Vol. 30 No. 2 Apr.-Jun. 2005 388 °“√·µ°µ— «æÕ≈‘ ‰µ√’ π„™â ·≈â « ‚¥¬„™â µ— «‡√à ߪؑ °‘ √‘ ¬“°√¥ Abstract Cracking of Used Polystyrene Using Acid Catalysts Arada Wongsuppaluk Somsak Damronglerd Fellow of the Academy of Science, The Royal Institute, Thailand The used polystyrene was mixed with one of three acid catalysts: HZSM-5, Fe/activated carbon and Co-Mo/Al 2 O 3 , in a micro reactor with a capacity of 70 ml. The cracking process was performed at a reaction temperature of 350-400 O C, reaction time 60-180 min, initial hydrogen pressure 1-5 bars and containing 0.1-1% w of HZSM-5, 1-5% wt of Fe/activated carbon and Co-Mo/Al 2 O 3 . A two- level factorial experimental design was done to produce the best product and components. The optimum conditions for cracking used PS on HZSM-5 were 370 O C, 90 min, 1 bar and 0.1% w catalyst content. The oil yield was 88.3% wt and consisted of gasoline, kerosene, light gas oil, gas oil and long residue, with 28, 3, 40, 3 and 26% contents, respectively. The optimum conditions of cracking used PS on Fe/activated carbon were 370 O C, 120 min, 1 bar and 5% w catalyst content . The oil yield was 88.7% w and consisted of gasoline, kerosene, light gas oil, gas oil and long residue , with 24, 1, 45, 2 and 28% contents, respectively. The optimum conditions of cracking used PS on Co-Mo/Al 2 O 3 were 370 O C, 90 min, 1 bar and 5%w catalyst content . The oil yield was 91.2% w and composed of gasoline, light gas oil, gas oil and long residue, with 33, 40, 1 and 26% contents, respectively. Key words : catalytic, cracking, polystyrene, HZSM-5, Co-Mo/Al 2 O 3