Tom qab tau txais kev txheeb xyuas thiab tshem tawm daim ntawv lo, PET lub raj mis yas tau muab txiav rau hauv cov khoom seem ntawm qhov loj ntawm tus ntiv tes. Cov fragments no tom qab lub cev qhuav dej thiab qhuav ntawm qhov kub ntawm 200℃kom tshem tawm cov kua seem thiab impurities, yog li npaj "lub tsev dawb huv" rau cov tshuaj tiv thaiv tom ntej.
Ob Txoj Kev Tseem Ceeb ntawm Decomposition
Pyrolysis: Hauv cov pa oxygen - ib puag ncig pub dawb, cov khoom siv tau ua kom sov li ntawm 400℃thiab 600℃. Qhov ntev - chains yas molecules-ntau zoo li tau dhau los ua "duplication spell"-ua rau thermal cracking, tawg mus rau hauv me me gaseous molecules xws li ethylene thiab propylene. Thaum condensed, cov roj no dhau los nrhiav- tom qab cov ntaub ntawv raw rau kev lag luam petrochemical.
Alcoholysis: Los ntawm "kev seev cev" ua yeeb yam hauv kev hais kwv txhiaj nrog ethylene glycol thiab lub catalyst, PET molecular chains tau maj mam dismantled rau hauv dimethyl terephthalate (DMT). Cov khoom no khav theeb purity tshaj 95% thiab tuaj yeem siv ncaj qha rau hauv kev tsim cov yas tshiab.
Technological Breakthroughs thiab yav tom ntej Prospects
Qhov kev sib tw tseem ceeb tshaj plaws tam sim no ntsib hauv thaj teb yog qhov nyuaj ntawm kev txheeb cov khoom sib xyaw ua ke-zoo li sim cais pawg ntawm cov LEGO sib xyaw ua ke los ntawm xim. Cov thev naus laus zis enzymatic degradation muaj peev xwm ua kom tawg qee yam ntawm cov yas ntawm qhov kub thiab txias, tsuas yog siv ib qho -feem kaum ntawm lub zog xav tau los ntawm pyrolysis. Lub caij no, cov cuab yeej hloov kho infrared tam sim no muaj peev xwm txheeb xyuas xya hom plastics, thawb kev txheeb xyuas qhov tseeb dhau los ntawm 90% qhov pib.