PTA (Pure Terephthalic Acid)
Chigadzirwa chekugadzira maitiro
PTA ndiyo yakaderera kupera kwe petroleum.Petroleum inopinda neimwe nzira kugadzira naphtha (inozivikanwawo sechiedza chepeturu), kubva mairi MX (yakasanganiswa xylene) inotorwa, uyezve PX (paraxylene) inotorwa.PTA inoshandisa PX seyakabikwa uye acetic acid seyakanyungudika, uye inoiswa oxidized nemhepo pasi pechiito checatalyst kuburitsa crude terephthalic acid.Zvadaro crude terephthalic acid is hydrorefined kubvisa tsvina, uye ipapo crystallized, kupatsanurwa, akaomeswa uye akagadzirirwa yakanatswa terephthalic acid zvigadzirwa, kureva, PTA apedza zvigadzirwa.
Product sumo
PTA ikristaro chena kana hupfu pane tembiricha yekamuri, yakaderera muchetura uye inopfuta.Kupisa kwayo i384 ~ 421 °C, kupisa kwepasi 98.4kJ/mol, kupisa kwemoto 3225.9kJ/mol, uye density 1.55g/cm3.Inonyungudika mualkali solution, inonyungudika zvishoma mukupisa ethanol, isinganyunguriki mumvura, ether, glacial acetic acid uye chloroform.
Product application
Zvigadzirwa zvakakosha zvekugadzira polyester fibers, mafirimu, zvigadzirwa zvepurasitiki, insulating pendi uye plasticizers, uye anoshandiswawo sepakati pedhayi.
PTA ndeimwe yakakosha yakawanda organic raw materials, inoshandiswa zvakanyanya mumakemikari fiber, chiedza indasitiri, zvemagetsi, kuvaka uye zvimwe zvinhu zvehupfumi hwenyika.
Kushandiswa kwePTA kwakanyanyisa, inopfuura 90% yePTA yenyika inoshandiswa mukugadzirwa kwe polyethylene terephthalate (inonzi polyester, PET).Kugadzira 1 toni yePET, 0.85-0.86 matani ePTA uye 0.33-0.34 matani eMEG (ethylene glycol) anodiwa.Polyester inosanganisira fiber chips, polyester fibers, bhodhoro machipisi uye mafirimu machipisi.MuChina, 75% yePTA inoshandiswa kugadzira polyester fiber;20% inoshandiswa mukugadzirwa kwebhodhoro-giredhi PET resin, inonyanya kushandiswa mukuputirwa kwezvinwiwa zvakasiyana-siyana, kunyanya zvinwiwa zvecarbonated;5% yefirimu-giredhi polyester, inonyanya kushandiswa mukurongedza zvinhu, mafirimu uye matepi.Naizvozvo, zvigadzirwa zvepasi pePTA zvakanyanya polyester fiber.
