SynopsisThermolysis and hydrogenolysis of polyethylene under steam pressure were carried out by batchwise autoclave in the recovery of liquid petrochemical resources from waste polymers. Thermolysis of polyethylene under steam pressure occurred in the temperature range 400-475°C and reaction pressures up to 213 bar. The presence of steam is advantageous for an increase in liquid products and 450°C is an appropriate temperature for the formation of low molecular aromatic compounds. Hydrogenolysis of polyethylene was studied a t 450°C and initial hydrogen pressure range of 10-100 bar under steam pressure. Over 80 wt % of the low-boiling product was converted to saturated hydrocarbons a t 40 bar hydrogen pressure, which corresponds to 1 mole hydrogen to 1 mole monomeric unit of polyethylene. The schemes for the thermolysis and the hydrogenolysis, especially the aromatization, are discussed.

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Hydrocracking reaction of ultraheavy oils is very complicated one and the reaction performance is affected not only by reaction conditions but also by feedstock properties. In order to estimate reaction performance of a bench scale experimental unit (BSU, 3bbl/day) accurately, we proposed a kinetic model for the hydrocracking reaction and found that the following parameters strongly affect to the reaction performance; i.e. temperature, pressure, catalyst loading, actual residence time, BTM (+525 °C), nitrogen, sulfur and the Conradson Carbon Residue (CCR) value in feedstocks and H/C in recycled BTM solution. Using these parameters, the rate constants were obtained by fitting experimental data of the BSU and each yield was estimated based on CSTR model with relatively small errors. The estimation method would be a basis to develop a simulation program for scaleup engineering.

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