PTA (Pure Terephthalic Acid)
Mokhoa oa tlhahiso ea lihlahisoa
PTA ke pheletso e tlase ea peterole.Petroleum e kena tšebetsong e itseng ea ho hlahisa naphtha (eo hape e tsejoang e le peterole e bobebe), eo ho eona ho ntšoang MX (xylene e tsoakiloeng), ebe PX (paraxylene) e ntšoa.PTA e sebelisa PX e le lintho tse tala le acetic acid e le solvent, 'me e kenngoa ka oxidized ke moea tlas'a ketso ea catalyst ho hlahisa terephthalic acid e tala.Joale e ntan'o ba a sa jese litheohelang terephthalic acid e hydrorefined ho tlosa litšila, 'me joale crystallized, arotsoe, omisitsoeng le lokiselitsoe hloekisitsoeng terephthalic acid lihlahisoa, ke hore, PTA qetile lihlahisoa.
Kenyelletso ea sehlahisoa
PTA ke kristale e tšoeu kapa phofo mocheso oa kamore, chefo e tlase ebile e ka cha.Sebaka sa eona sa ho besa ke 384 ~ 421 °C, mocheso oa sublimation 98.4kJ / mol, mocheso oa mollo 3225.9kJ / mol, le boima ba 1.55g / cm3.E qhibiliha ka har'a motsoako oa alkali, e qhibiliha hanyane ka har'a ethanol e chesang, ha e qhibilihe metsing, ether, glacial acetic acid le chloroform.
Sesebelisoa sa sehlahisoa
Lisebelisoa tsa bohlokoa tsa tlhahiso ea likhoele tsa polyester, lifilimi, lihlahisoa tsa polasetiki, lipente tse sireletsang le polasetiki, hape li sebelisoa e le li-intermediate tsa dae.
PTA ke e 'ngoe ea lisebelisoa tsa bohlokoa tse ngata tse tala, tse sebelisoang haholo ho fiber ea lik'hemik'hale, indasteri e bobebe, lisebelisoa tsa elektroniki, kaho le likarolo tse ling tsa moruo oa naha.
Tšebeliso ea PTA e batla e tsepamisitsoe, ho feta 90% ea PTA ea lefats'e e sebelisoa ho hlahisa polyethylene terephthalate (e bitsoang polyester, PET).Ho hlahisa lithane tse 1 tsa PET, lithane tse 0.85-0.86 tsa PTA le lithane tse 0.33-0.34 tsa MEG (ethylene glycol) lia hlokahala.Polyester e kenyelletsa li-fiber chips, likhoele tsa polyester, li-chips tsa botlolo le lichifi tsa filimi.Chaena, 75% ea PTA e sebelisetsoa ho hlahisa fiber ea polyester;20% e sebelisoa ha ho etsoa resin ea PET ea botlolo, e sebelisoang haholo ho paka lino tse fapa-fapaneng, haholo-holo lino tse nang le carbonate;5% bakeng sa polyester ea boemo ba lifilimi, e sebelisoang haholo linthong tsa ho paka, lifilimi le litheipi.Ka hona, lihlahisoa tse tlase tsa PTA ke haholo-holo fiber ea polyester.
