PTA (Ntshiab Terephthalic Acid)
Cov txheej txheem tsim khoom
PTA yog qhov qis kawg ntawm roj av.Petroleum tau dhau los ua cov txheej txheem los tsim cov naphtha (tseem hu ua lub teeb roj av), uas MX (mixed xylene) tau muab rho tawm, thiab tom qab ntawd PX (paraxylene) tau muab rho tawm.PTA siv PX ua raw khoom thiab acetic acid ua hnyav, thiab yog oxidized los ntawm huab cua nyob rau hauv qhov kev txiav txim ntawm ib tug catalyst los tsim crude terephthalic acid.Tom qab ntawd cov crude terephthalic acid yog hydrorefined kom tshem tawm impurities, thiab ces crystallized, sib cais, qhuav thiab npaj refined terephthalic acid cov khoom, uas yog, PTA tiav cov khoom.
Khoom taw qhia
PTA yog dawb siv lead ua los yog hmoov nyob rau hauv chav tsev kub, tsis tshua muaj toxicity thiab flammable.Nws ignition point yog 384 ~ 421 ° C, sublimation tshav kub 98.4kJ / mol, combustion kub 3225.9kJ / mol, thiab ceev 1.55g / cm3.Nws yog soluble nyob rau hauv alkali tov, me ntsis soluble nyob rau hauv kub ethanol, insoluble nyob rau hauv dej, ether, glacial acetic acid thiab chloroform.
Daim ntawv thov khoom
Cov ntaub ntawv tseem ceeb rau kev tsim cov polyester fibers, zaj duab xis, cov khoom yas, insulating xim thiab plasticizers, thiab kuj tseem siv los ua cov xim nruab nrab.
PTA yog ib qho tseem ceeb ntawm cov organic raw cov ntaub ntawv, dav siv nyob rau hauv tshuaj fiber ntau, lub teeb kev lag luam, electronics, kev tsim kho thiab lwm yam ntawm lub teb chaws kev khwv nyiaj txiag.
Daim ntawv thov ntawm PTA yog qhov tseem ceeb, ntau dua 90% ntawm lub ntiaj teb PTA yog siv los tsim cov polyethylene terephthalate (hu ua polyester, PET).Yuav kom tsim tau 1 tuj ntawm PET, 0.85-0.86 tons ntawm PTA thiab 0.33-0.34 tons ntawm MEG (ethylene glycol) yuav tsum tau.Polyester suav nrog fiber ntau chips, polyester fibers, lub raj mis chips thiab zaj duab xis chips.Hauv Suav teb, 75% ntawm PTA yog siv los tsim polyester fiber;20% yog siv rau hauv kev tsim cov raj mis qib PET resin, feem ntau yog siv rau hauv ntim ntawm ntau yam dej haus, tshwj xeeb tshaj yog cov dej haus carbonated;5% rau cov yeeb yaj kiab-qib polyester, feem ntau yog siv hauv cov khoom ntim, cov yeeb yaj kiab thiab cov ntaub nplaum.Yog li ntawd, cov khoom qis ntawm PTA feem ntau yog polyester fiber.
