PTA (Pure Terephthalic Acid)
Kaʻina hana huahana
ʻO PTA ka hopena haʻahaʻa o ka ʻaila.Hana ʻia ka ʻaila hinu i kekahi kaʻina hana no ka hana ʻana i ka naphtha (ʻike pū ʻia ʻo ka ʻaila māmā), kahi e unuhi ʻia ai ka MX (xylene hui ʻia), a laila lawe ʻia ka PX (paraxylene).Hoʻohana ʻo PTA i ka PX ma ke ʻano he mea maka a me ka ʻakika acetic ma ke ʻano he mea hoʻoheheʻe ʻia, a ua hoʻoheheʻe ʻia e ka ea ma lalo o ka hana a ka catalyst e hoʻohua ai i ka waikawa terephthalic crude.A laila ua hydrorefined ka waika terephthalic crude e wehe i nā haumia, a laila crystallized, hoʻokaʻawale, maloʻo a hoʻomākaukau i nā huahana terephthalic acid i hoʻomaʻemaʻe ʻia, ʻo ia hoʻi, nā huahana PTA i hoʻopau ʻia.
Hoʻolauna huahana
ʻO ka PTA he aniani keʻokeʻo a i ʻole ka pauka ma ka lumi wela, haʻahaʻa haʻahaʻa a hiki ke puhi ʻia.Kona ignition wahi mea 384 ~ 421 °C, sublimation wela 98.4kJ/mol, combustion wela 3225.9kJ/mol, a me 1.55g/cm3.Hiki ke hoʻoheheʻe ʻia i ka solution alkali, hiki ke hoʻoheheʻe ʻia i ka ethanol wela, hiki ʻole ke hoʻoheheʻe ʻia i ka wai, etera, glacial acetic acid a me ka chloroform.
noi huahana
ʻO nā mea waiwai koʻikoʻi no ka hana ʻana i nā fiber polyester, nā kiʻiʻoniʻoni, nā huahana plastik, nā pena insulating a me nā plasticizers, a ua hoʻohana pū ʻia hoʻi e like me nā mea pena.
ʻO PTA kekahi o nā mea waiwai nui nui, hoʻohana nui ʻia i ka fiber kemika, ka ʻoihana māmā, ka uila, ke kūkulu ʻana a me nā mea ʻē aʻe o ka ʻoihana aupuni.
Hoʻopili ʻia ka noi o PTA, ʻoi aku ma mua o 90% o ka PTA o ka honua i hoʻohana ʻia i ka hana ʻana o ka polyethylene terephthalate (i kapa ʻia ʻo polyester, PET).No ka hana 'ana i 1 tona PET, 0.85-0.86 tona PTA a me 0.33-0.34 tona MEG (ethylene glycol).Hoʻokomo ka Polyester i nā ʻāpana fiber, nā pulu polyester, nā ʻōmole a me nā ʻāpana kiʻiʻoniʻoni.Ma Kina, hoʻohanaʻia ka 75% o PTA e hana i ka fiber polyester;Hoʻohana ʻia ʻo 20% i ka hana ʻana i ka resin PET-grade PET, hoʻohana nui ʻia i ka hoʻopili ʻana o nā mea inu like ʻole, ʻoi aku ka nui o nā mea inu carbonated;5% no ka polyester kiʻi kiʻiʻoniʻoni, hoʻohana nui ʻia i nā mea hoʻopihapiha, nā kiʻiʻoniʻoni a me nā lipine.No laila, ʻo nā huahana o lalo o ka PTA he polyester fiber.
