Emva kokuba isihluzo sekhandlela sisetyenziselwe ixesha elithile kumgca wokujikeleza, uya kuthintelwa bubumdaka, kwaye umahluko woxinzelelo phakathi kokungena kunye nokuphuma kwenkqubo yokucoca i-polymer enyibilikayo uya kwanda, kwaye ezi zihluzo zekhandlela ezicetyisiweyo icocwe phambi kokuba iphinde isetyenziswe.Ukucoca ikakhulu kusetyenziswa iindlela zomzimba kunye neekhemikhali kwi-calcine, ukunyibilika, i-oxidize okanye i-hydrolyze i-polymer edibeneyo kwiqondo lokushisa eliphezulu, kwaye emva koko wenze ukuhlamba kwamanzi, ukuhlamba i-alkali (i-asidi) kunye nokucoca i-ultrasonic.
Iindlela zokucoca ziquka: indlela yokubala, ukuhlamba ityuwa, indlela ye-tri-ethylene glycol, indlela yokushisa ephezulu ye-hydrolysis, indlela yokulala ye-alumina, kunye nendlela yokucoca i-vacuum.Okwangoku, iindlela zokucoca ezisetyenziswa ngokuqhelekileyo ziyi-tri-ethylene glycol indlela, indlela yokushisa ephezulu ye-hydrolysis, kunye nendlela yokucoca i-vacuum.
Indlela ye-tri-ethylene glycol kukusebenzisa umgaqo wokuba i-polymer inokuchithwa nge-tri-ethylene glycol kwindawo yokubilisa ye-tri-ethylene glycol (285 ° C kwixinzelelo oluqhelekileyo) ukufezekisa injongo yokucoca.Isinyathelo sokucoca kukubeka into eya kuhlanjululwa kwitanki ye-tri-ethylene glycol kunye nenkqubo yokufudumeza, iphakamise ukusuka kwiqondo lokushisa ukuya kwi-265 ° C, igcine ishushu kwiiyure ze-6, emva koko ipholile ukuya kwi-100 ° C. ngokwendalo, khupha into eza kucocwa, uyibeke kuyo Yihlambe kwitanki yamanzi ashushu malunga ne-95 ° C malunga nemizuzu engama-20, uze uyifake kwisisombululo se-10% se-NaOH kwiqondo lokushisa lama-60-70 ° C. Iiyure ezili-12, uze uyihlambe ngamanzi ashushu.Ukuba i-spinneret kunye ne-melt filter element, ukucocwa kwe-ultrasonic kuyadingeka.Indawo yokucoca ngamanzi acocekileyo kwiqondo lobushushu le-60-70 ° C.Ixesha lokucoca liyi-15-20 imizuzu kwaye ekugqibeleni livuthelwe ngomoya oxinyiweyo.
Indlela yokushisa ephezulu ye-hydrolysis kukusebenzisa i-polymer ukuba i-hydrolyzed ngokulula kwaye i-alkaline ifakwe kwi-hydrolyzed kwiqondo lokushisa eliphezulu ukuvelisa izinto eziphantsi kwee-molecular, ukuze kufezekiswe injongo yokususwa.Kukubeka into ekufuneka ihlanjululwe kwi-autoclave, i-steam yokutya ye-0.3-0.6MPa, iqondo lokushisa li malunga ne-130-160 ° C, kwaye ixesha liyi-2-8 iiyure.Kwi-autoclave, ukuba inani elincinci le-NaOH liyongezwa, ixesha lokucoca lingancitshiswa, kwaye ke ukuhlamba amanzi, ukuhlamba i-alkali, kunye nokucoca i-ultrasonic ingasetyenziswa.
Indlela yokucoca i-vacuum ikwabizwa ngokuba yi-vacuum pyrolysis indlela.Umgaqo wayo wokusebenza kukuqala ukuphakamisa izinga lokushisa ukuya kwi-300 ° C kwaye ligcine lifudumele ixesha elithile lokunyibilikisa i-polyester okanye ezinye iipolymers eziphezulu kwindawo yokusebenza ukuba iqhutywe, kwaye izinto ezityhidiweyo ziphuma kwaye zikhutshwe.Emva koko ubushushu, malunga ne-350 ° C, i-polyester eseleyo iqala ukubola, ngeli xesha, vula ipompo yokucoca ukuba ikhuphe, ukushisa ukuya kwi-500 ° C, kwaye uhlale ushushu.Ngexesha elifanayo, ixabiso elincinci lomoya lingeniswa kwi-oxidize intsalela.Kwimeko ye-vacuum, ukuchithwa kwe-thermal kunye nokuchithwa kwe-oxidative ye-polyester eseleyo ngokukhawuleza, kwaye i-gas eveliswayo kunye ne-ash particles zixutywe ukuze zifezekise injongo yokucoca.
Ixesha lokuposa: Aug-01-2023