I-PTA (i-Terephthalic Acid enyulu)
Inkqubo yokuvelisa imveliso
I-PTA sisiphelo esisezantsi se-petroleum.I-Petroleum idlula kwinkqubo ethile yokuvelisa i-naphtha (ekwabizwa ngokuba yipetroli ekhanyayo), apho i-MX (i-xylene exutywe) ikhutshwa, kwaye emva koko i-PX (i-paraxylene) ikhutshwe.I-PTA isebenzisa i-PX njengento eluhlaza kunye ne-acetic acid njenge-solvent, kwaye i-oxidized emoyeni phantsi kwesenzo se-catalyst ukuvelisa i-terephthalic acid ekrwada.Emva koko i-asidi ye-terephthalic ekrwada i-hydrorefined ukususa ukungcola, kwaye emva koko i-crystallized, ihlulwe, yomiswe kwaye ilungiswe imveliso ye-terephthalic acid, oko kukuthi, iimveliso ze-PTA ezigqityiweyo.
Intshayelelo yemveliso
I-PTA yikristale emhlophe okanye umgubo kwiqondo lobushushu begumbi, ubuthi obuphantsi kunye nokutsha.Indawo yokutshisa i-384 ~ 421 ° C, ukushisa kwe-sublimation 98.4kJ / mol, ukushisa okutshisa 3225.9kJ / mol, kunye nobuninzi be-1.55g / cm3.Iyanyibilika kwisinyibiliko sealkali, inyibilika kancinane kwi-ethanol eshushu, ayinyibiliki emanzini, i-ether, i-acetic acid ekhenkcezayo kunye neklorofomu.
Isicelo semveliso
Imathiriyeli ekrwada ebalulekileyo yokwenziwa kweentsinga zepolyester, iifilim, iimveliso zeplastiki, iipeyinti ezigqumayo kunye neplastiki, kwaye zikwasetyenziswa njengeziphakathi zedayi.
I-PTA yenye yezinto ezibalulekileyo ze-organic ekrwada, ezisetyenziswa ngokubanzi kwifayibha yemichiza, kushishino olukhanyayo, umbane, ulwakhiwo kunye neminye imiba yoqoqosho lwesizwe.
Ukusetyenziswa kwe-PTA kugxininiswe, ngaphezu kwe-90% ye-PTA yehlabathi isetyenziselwa ukuveliswa kwe-polyethylene terephthalate (ebizwa ngokuba yi-polyester, i-PET).Ukuvelisa i-1 ton ye-PET, iitoni ze-0.85-0.86 ze-PTA kunye ne-0.33-0.34 yeetoni ze-MEG (ethylene glycol) ziyafuneka.Ipolyester ibandakanya iitshiphusi zefiber, iifiber zepolyester, iitshiphusi zebhotile kunye neechips zefilimu.E-China, i-75% ye-PTA isetyenziselwa ukuvelisa i-polyester fiber;I-20% isetyenziselwa ukuveliswa kwe-bottle-grade PET resin, eyona nto isetyenziselwa ukupakishwa kweziphuzo ezahlukeneyo, ngakumbi iziphuzo ze-carbonated;I-5% ye-polyester yebakala lefilimu, esetyenziswa kakhulu kwizinto zokupakisha, iifilimu kunye neeteyipu.Ke ngoko, iimveliso ezisezantsi zePTA ziyifiber yepolyester.
