Ukuxubha kwe-DOTP kusuka ku-PET kanye ne-octanol

Kwadalwa ngo 12.19

Ukuxubha kwe-DOTP kusuka ku-PET kanye ne-octanol

Iphuzu eliyinhloko lokuhlanganisa i-dioctyl terephthalate (DOTP) usebenzisa i-polyethylene terephthalate (PET) kanye ne-octanol ukuhlela ukuhluza i-PET nokuhlanganiswa ne-octanol ngokusebenzisa i-transesterification. Okulandelayo kuyindlela ethile esekelwe emsebenzini wezobuchwepheshe kanye nemiphumela yocwaningo lwezesayensi:

Umqondo wokuphendula

Ibhondi ye-ester ku-PET molecular chain iyaphukiswa ngaphansi kokusebenza kwe-octanol kanye ne-catalyst, futhi i-ethylene glycol ibanjwa yi-octanol, ikhiqiza i-DOTP kanye nomkhiqizo ohlobene i-ethylene glycol:

Le nqubo ihilela ukuhlinzeka ngesisekelo se-polymer ye-PET ngokusebenzisa i-alcoholysis, kulandela ukushintshwa kwezigaba zomsebenzi ngokusebenzisa i-transesterification.

II. Izinyathelo ezibalulekile

Ukulungiswa kwezinto zokwakha

Ukucubungula i-PET: Susa izinto ezingcolile kwi-PET yedlule futhi uyigaye ibe ngamaphuzu angu-2-4mm.

Ukukhetha i-Octanol: Sebenzisa i-isooctanol yeziqu zezimboni (2-ethylhexanol) enokuhlanzeka okungu-≥99%, futhi ungeze okungaphezulu ukuze uqhubeke nomphumela oya phambili.

2. Inqubo yokukhiqiza eqhubekayo

Ukucushwa kwemishini: I-reactor ye-alcoholysis yokudla okuqhubekayo isetshenziswa, ihlinzekwa ngethala lokuhlunga, ithangi lokwamukela i-ethylene glycol elinamakholomu amaningi, kanye nomshini wokuhlunga i-octanol.

Ukuklama inqubo:

Isigaba se-Alcoholysis: I-PET, i-octanol, kanye ne-catalyst zixutshwe ekushiseni okuphezulu emgqonyeni wokuphendula, futhi i-ethylene glycol kanye ne-octanol umusi okhiqizwayo kungena kwi-distillation column.

Isigaba sokuhlukanisa: Ngemuva kokuphola, umusi ungena ethankini yokwamukela yesibili, lapho i-ethylene glycol ithathwa ngamanzi. I-octanol ikhishwa emanzini ngethala lokomisa bese ibuyiselwa ukuze isetshenziswe.

Isigaba sokuhlanzwa: I-mix ye-reactor ibhekiswa ekukhishweni kwe-vacuum ukuze kuhlukaniswe i-octanol esele, bese izinsalela zikhishwa ngokusebenzisa i-activated carbon adsorption kanye nokuhlanza ngamanzi, ekugcineni kukhiqiza i-DOTP.

III. Ukuhlukaniswa nokuhlanzwa

Ukucubungula umkhiqizo omkhulu: Ngemuva kokupholisa ingxube yokuphendula, sebenzisa ukususa ukuze ususe i-PET engaphendulwanga.

Ukubuyiselwa kokuhlunga:

Ukudiliza kwe-vacuum: Hlukana ne-octanol engaphendulwanga (umkhiqizo ophumelele > 90%) kanye ne-DOTP.

Ukukhishwa kwe-vacuum: ukuhlanza i-ethylene glycol ukuze ihlangabezane nezinga lekhwalithi ephezulu (ukuhlanzeka > 99.5%).

Ukucutshungulwa okujulile: Sebenzisa ikhabhoni esebenzayo ukuze uthole ukuhlanganiswa nokususa umbala (ngokusebenzisa umthamo we-5% wesisindo somkhiqizo), hlanganisa ku-80°C isikhathi esingu-1 ihora, bese uhlunga ukuze uthole i-DOTP engenombala futhi ecacile.

IV. Ukuphepha kanye Nezindleko

Ukulawulwa kwezingozi: Imiphumela yokushisa ephezulu kufanele yenziwe emoyeni ongaphenduki (njengokuthi i-nitrogen) ukuze kugwenywe ukuhoxiswa kwe-octanol; ama-catalysts (njengokuthi i-tetrabutyl titanate) kufanele agcinwe ezimeni ezivaliwe ukuze kugwenywe i-hydrolysis.

Izinzuzo zokonga:

Ukusebenzisa i-PET eyinsalela kunganciphisa izindleko zokuthenga izinto zokwakha ngama-40%-60%, kuyilapho kunciphisa nezindleko zokulahla udoti.

Ukutshalwa kwezimali kwezinsiza zokusebenza ezinqubweni eziqhubekayo kungabuyiselwa phakathi kweminyaka engu-2-3 ngokusebenzisa ukonga kwezinto zokwakha kanye nokwandiswa kwamandla okukhiqiza.

Ngalezi zindlela ezishiwo ngenhla, ukusetshenziswa kahle kwezinsiza ze-PET kungafezeka, ngasikhathi sinye kutholakala i-plasticizer enobungane bemvelo i-DOTP enezici ezinhle, ngaleyo ndlela kuzuze kokubili izinzuzo zezimali nezemvelo.

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