I-PTA (Pure Terephthalic Acid)
Inqubo yokukhiqiza umkhiqizo
I-PTA isiphetho esiphansi se-petroleum.I-Petroleum ingena inqubo ethile yokukhiqiza i-naphtha (ebuye yaziwe ngokuthi uphethiloli okhanyayo), lapho kukhishwa khona i-MX (i-xylene exutshwe), bese kukhishwa i-PX (paraxylene).I-PTA isebenzisa i-PX njengempahla eluhlaza kanye ne-acetic acid njengesixazululi, futhi ifakwa umoya oksijini ngaphansi kwesenzo se-catalyst ukukhiqiza i-terephthalic acid engahluziwe.Khona-ke i-terephthalic acid engahluziwe i-hydrorefined ukuze isuse ukungcola, bese icwecwe, ihlukaniswe, yomiswe futhi ilungiswe imikhiqizo ye-terephthalic acid, okungukuthi, imikhiqizo eqediwe ye-PTA.
Isingeniso somkhiqizo
I-PTA iyikristalu emhlophe noma impushana ekamelweni lokushisa, ubuthi obuphansi futhi iyavutha.Iphoyinti layo lokuthungela lingu-384~421 °C, ukushisa kwe-sublimation okungu-98.4kJ/mol, ukushisa komlilo okungu-3225.9kJ/mol, kanye nokuminyana okungu-1.55g/cm3.Iyancibilika kusisombululo se-alkali, inyibilika kancane ku-ethanol eshisayo, ayincibiliki emanzini, i-ether, i-glacial acetic acid ne-chloroform.
Isicelo somkhiqizo
Izinto zokusetshenziswa ezibalulekile zokwenza imicu ye-polyester, amafilimu, imikhiqizo yepulasitiki, amapende okuvikela i-insulating kanye nama-plasticizers, futhi asetshenziswa njengeziphakathi zikadayi.
I-PTA ingenye yezinto ezibalulekile ngobuningi bezinto ezingavuthiwe, ezisetshenziswa kabanzi kumakhemikhali e-fiber, imboni ekhanyayo, i-electronics, ukwakhiwa nezinye izici zomnotho wezwe.
Ukusetshenziswa kwe-PTA kugxile kakhulu, ngaphezu kwe-90% ye-PTA yomhlaba isetshenziswa ekukhiqizeni i-polyethylene terephthalate (okubizwa ngokuthi i-polyester, i-PET).Ukukhiqiza ithani elingu-1 le-PET, amathani angu-0.85-0.86 we-PTA kanye namathani angu-0.33-0.34 we-MEG (ethylene glycol) ayadingeka.I-polyester ihlanganisa ama-fiber chips, ama-polyester fibers, amabhodlela ama-chips nama-movie chips.E-China, i-75% ye-PTA isetshenziselwa ukukhiqiza i-polyester fiber;I-20% isetshenziselwa ukukhiqizwa kwe-PET resin ye-bottle-grade, ikakhulukazi esetshenziselwa ukupakishwa kweziphuzo ezihlukahlukene, ikakhulukazi iziphuzo ze-carbonated;I-5% ye-polyester yebanga lefilimu, esetshenziswa kakhulu ezintweni zokupakisha, amafilimu namateyipu.Ngakho-ke, imikhiqizo engezansi ye-PTA ikakhulukazi i-polyester fiber.
