Waste samples of polyethylene and polystyrene were cracked thermally or in
the presence of catalyst and hydrogen in closed autoclaves. The obtained pr
oducts were submitted to analysis, unsaturated hydrocarbons in gasoline and
diesel fuel range boiling were hydrogenated over platinum catalyst. It was
stated that the optimum thermal cracking temperature of waste polyolefines
is 410-430 degreesC, in the case of catalytic process lower temperature, c
a. 390 degreesC, can be used, with reaction time ca. 1.5 an hour. More than
90% yield of gas and liquid fractions with b.p. < 360<degrees>C was attain
ed. The dependencies between process parameters, feed composition and produ
ct yield as well as composition of the obtained fuel fractions were found.
On the basis of the obtained results hypothetical continuous process of was
te plastics processing for engine fuel production was presented. (C) 2001 E
lsevier Science B.V. All rights reserved.