Separation and characterization of products from thermal cracking of individual and mixed polyalkenes
-
E. Hájeková
,
L. Špodová
Abstract
Low-density polyethylene (LDPE), polypropylene (PP), and their mixture in the mass ratio of 1: 1 (LDPE/PP) were thermally decomposed in a batch reactor at 450°C. The formed gaseous and oil/wax products were separated and analyzed by gas chromatography. The oils/waxes underwent both atmospheric and vacuum distillation. Densities, molar masses and bromine numbers of liquid distillates and distillation residues were determined. The first distillate fraction from the thermally decomposed LDPE contained mostly linear alkanes and alk-1-enes ranging from C6 to C13 (boiling point up to 180°C). The second distillate fraction was composed mostly of hydrocarbons C11 to C22 (boiling point up to 330°C). 2,4-Dimethylhept-1-ene was the major component of the first distillate fraction obtained from the product of PP decomposition, while in the 2nd distillate fraction it was 2,4,6,8-tetramethylundec-1-ene. The yields of some gaseous or liquid hydrocarbons obtained by distillation from thermally degraded LDPE/PP differed from the values corresponding to the decomposition of individual plastics due to the mutual influence of polyalkenes during their thermal cracking. Similarly, the yields of propene and methylpropene in the gaseous phase were higher in the case of mixture. Whereas the content of C9 to C17 alkanes and alkenes in the distillates separated from the liquid mixture obtained by the decomposition of LDPE/PP decreased, the formation of 2,4,6,8,10,12-hexamethylpentadec-1-ene remained unchanged. The corresponding mechanisms of thermal cracking were discussed.
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© 2007 Institute of Chemistry, Slovak Academy of Sciences
Articles in the same Issue
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- Separation and characterization of products from thermal cracking of individual and mixed polyalkenes
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- Enantioselective extraction of mandelic acid enantiomers by L-dipentyl tartrate and β-cyclodextrin as binary chiral selectors
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Articles in the same Issue
- Step by step towards understanding gold glyconanoparticles as elements of the nanoworld
- Structure—activity relationships for in vitro oxime reactivation of chlorpyrifos-inhibited acetylcholinesterase
- Separation and characterization of products from thermal cracking of individual and mixed polyalkenes
- Mobility of important toxic analytes in urban dust and simulated air filters determined by sequential extraction and GFAAS/ICP-OES methods
- Effect of addition of ameliorative materials on the distribution of As, Cd, Pb, and Zn in extractable soil fractions
- Effect of gamma irradiation on trichromatic values of spices
- Homo- and heteronuclear complexes of a new, vicinal dioxime ligand
- Synthesis of new triphenodithiazine- and indolocarbazolediones of biological interest
- Dielectric relaxation of butyl acrylate—alcohol mixtures using time domain reflectometry
- Ab initio study of small coinage metal telluride clusters AunTem (n, m = 1, 2)
- Binding affinities and spectra of complexes formed by dehydrotetrapyrido[20]annulene and small molecules
- Comparison of spectrophotometric and HPLC methods for determination of lipid peroxidation products in rat brain tissues
- Enantioselective extraction of mandelic acid enantiomers by L-dipentyl tartrate and β-cyclodextrin as binary chiral selectors
- Mechanism of thermal decomposition of cobalt acetate tetrahydrate
- Three-component, one-pot synthesis of 3,4-dihydropyrimidin-2-(1H)-ones catalyzed by bromodimethylsulfonium bromide
