Purified Terephthalic Acid (PTA) yog dab tsi?
Nws yog cov khoom siv raw uas siv rau hauv kev tsim cov khoom siv ntau txheej ua tau zoo ib yam li polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) thiab txawm tias cov ntaub ntawv ntawm bioplastics.
Nws tseem pom nws txoj kev siv dav hauv cov khoom siv hluav taws xob polyester nyob hauv lub ntiaj teb ua lag luam. Lawv siv los tsim cov txheej txheem polyester txheej rau kev tsim cov hlau dav dav, khoom siv hluav taws xob, tsheb, kev lag luam txij nkawm txawm tias txheej coil.
Keeb Kwm
Thawj chav tsev rau kev tsim PTA raug teeb tsa xyoo 1961 thiab chav ntxiv thib ob tau tsim xyoo 1991. Txawm li cas los xij, cov khoom siv roj av no twb tau npaj ua ntej xyoo 1967 thaum Amoco Chemicals Belgium tau tsim.
Khoom
PTA feem ntau siv los ua cov khoom lag luam kom zoo rau kev ua ntau yam thermoplastics. Nws muaj cov yam ntxwv tshwj xeeb uas txhim kho nws lub peev xwm los siv ua khoom siv raw khoom. Cov khoom no suav nrog:
Zoo heev huab cua
Kev tawm tsam ntawm cov tshuaj & stains
Tawv & yooj yim
Zoo iav hloov ua haujlwm kub
Npaum hmoov khiav & cov dej ua kom zoo.
Lub cev nqaij daim tawv
Qhov ceev - 1.522 g / cm3
Melting Point - 427 degrees C
Boiling Point - Decomposes
Acidity - 3.51, 4.28 [1]
Ntiaj Teb Ntau Lawm
Cov Txheej Txheem Ntau Lawm
Txij li xyoo 1960 TPA yog tsim los ntawm bromine txhawb catalytic oxidation ntawm p-xylene, thiab tom qab ntawd yog kev huv huv los ntawm cov txheej txheem ntawm hydrogenation. Txawm li cas los xij ntau kev txhim kho tau ua tiav hauv cov txheej txheem no (oxidation & purification ob qho tib si).
Tom qab xyoo 2000, cov txheej txheem tsim khoom tshiab tau raug tsim npe hu ua "X Technology". Tus txheej txheem tshiab no suav nrog cov hau kev tshiab rau kev coj ua dej rov qab thiab cov txheej txheem cais cov kua ua kom zoo dua.
Raws li cov txheej txheem no, PTA raug tsim tawm hauv cov peev txheej qis dua thiab kev ua haujlwm tsawg.
