Abstract
Quantitative analysis of oxidative pyrolysis pyoducts of polyethylene was tried by applying the sampling system which had been developed previously by auther. One milligram of high-density polyethylene was pyrolyzed at various temperatures (300-, 400-, 500-, 600-, 700-, and 800°C) in air (flow rate : 25ml/min). The pyrolysis products were collected in two cold traps of glass tubing (inner diameter : 3mm) packed with Porapak Q in 1 cm length. The traps were connected in series and were cooled in a Dry ice-acetone bath and a liquid nitrogen bath, respectively. The products which were collected fractionally in these traps were released by heating the traps and were analyzed with gas chromatograph and gas chromatography-mass spectrometry. Following components were analyzed quantitatively : alkanes, alkenes, and alkadienes of carbon number from 1 to 11, acethylene, cyclopentadiene, benzene, and other aromatic hydrocarbons, saturated aliphatic aldehydes of carbon number from 1 to 9, acrylic aldehyde, acetone, methyl ethyl ketone, saturated fatty acids of carbon number from 2 to 4, acrylic acid, carbon monoxide, and carbon dioxide. Among these products, yields of alkenes and aldehydes were remarkably large compared with other products at every pyrolysis temperature. The yield of hydrocarbons increases and that of carbonyl compounds decreases with increasing pyrolysis temperature.
