%0 Journal Article
%T MethanolsisofPoly(ethyleneterephthalate)inSupercriticalPhase
%A YangYong
%A XiangHong-wei
%A etal.
%J 过程工程学报
%D 2001
%X Thedepolymerizationofpoly(ethyleneterephthalate,PET)insupercriticalmethanolisstudiedusingastainlessstirredautoclaveattemperatureof255~260℃,pressureof8.5~14.0MPa,andmethanol/PETweightratioof3~8.Undertheoptimalconditions,thePETisdepolymerizedcompletelytoitsmonomersin60min.Themainproductsofthereactionaredimethylterephthalateandethyleneglycol.Therearestillsomesmallamountsofbyproducts,suchasmethyl？(2-hydroxyethyl)terephthalate,bis(hydroxyethyl)terephthalate,dimersandoligomers.Reversed-phasehighperformanceliquidchrom-atographyandgaschromatographyareusedtoanalyzesolidproductsandliquidproductsrespectively.TheresultsofdepolymerizationshowthattheyieldofdimethylterephthalateandthedegreeofPETdepolymerizationaredependentonthereactiontemperature,weightratioofmethanoltoPETandreactiontime.Butthereactionpressurehaslittleinfluenceonthedepolymerizationaslongasmethanolisinsupercriticalstate.
%K polyethyleneterephthalate(PET)
%K methanolysis
%K chemicalrecycling
%K supercriticalfluid
%K depolymerization
%U http://www.jproeng.com/qikan/Cpaper/zhaiyao.asp?bsid=763