论文信息 - Tertiary polymer recycling: study of polyethylene thermolysis as a first step to synthetic diesel fuel

Tertiary polymer recycling: study of polyethylene thermolysis as a first step to synthetic diesel fuel

Abstract High density polyethylene (HDPE) thermolysis and polyethylene derived oil hydrogenation were studied as two steps of a novel process to convert waste polyethylene (PE) into a hydrocarbon liquid suitable for use as diesel fuel. This report is focused on the thermolysis of PE. The effects of reaction conditions on reaction rate as well as on the physical and chemical properties of the products were examined. Thermolysis products consisted of liquids (PE oil), polymer residue and gas. The liquid product composition was 80–90 wt. % straight chain alkanes and 1-alkenes. Semi-batch reactor thermolysis rates were found to be in good agreement with a theoretical model from the literature. The kinetics of formation of light C 6 –C 11 , medium C 12 –C 16 and heavy C 17 –C 20 n -alkane and 1-alkene product fractions from HDPE thermolysis were determined in the temperature range of 400–440°C. Subsequent hydrogenation of the PE oil resulted in a diesel fuel with a high cetane index and low sulphur and aromatic content.

F. Ng | Norbert Horvat | FloraT.T. Ng | N. Horvat

[1] H. Jellinek. Thermal degradation of polystyrene and polyethylene. Part III , 1949 .

[2] K. Murata,et al. Thermal Degradation of High Density Polyethylene , 1973 .

[3] T. Ikemura,et al. Effect of branching of polyolefin backbone chain on catalytic gasification reaction , 1989 .

[4] Y. Uemichi,et al. Gas chromatographic determination of the products of degradation of polyethylene over a silica—alumina catalyst , 1983 .

[5] M. R. Kamal,et al. Thermolysis of polyethylene , 1995 .

[6] R. H. Boyd. Theoretical depolymerization kinetics. IV. Effect of a volatile fraction on the degradation of an initial “most probable” polymer , 1967 .

[7] Tadashi Yoshida,et al. Gasification of Polyethylene over Solid Catalysts (Part 2) , 1975 .

[8] J. Kuipers,et al. Kinetics of the low-temperature pyrolysis of polyethene, polypropene and polystyrene modeling, experimental determination and comparison with literature models and data , 1997 .

[9] V. Cozzani. Characterization of Coke Formed in the Pyrolysis of Polyethylene , 1997 .

[10] Paul N. Sharratt,et al. Production of hydrocarbons by catalytic degradation of high density polyethylene in a laboratory fluidised-bed reactor , 1998 .