Acid Terephthalic dị ọcha (PTA)
Usoro mmepụta ngwaahịa
PTA bụ njedebe ala nke mmanụ ala.Petroleum na-enweta usoro ụfọdụ iji mepụta naphtha (nke a makwaara dị ka mmanụ ọkụ ọkụ), nke a na-esi na ya na-amịpụta MX (mixed xylene), wee wepụ PX (paraxylene).PTA na-eji PX dị ka akụrụngwa na acetic acid dị ka ihe mgbaze, ma ikuku na-eme ka ikuku oxidized n'okpuru ọrụ nke ihe na-akpali akpali iji mepụta acid terephthalic crude.Mgbe ahụ, a na-edozi acid terephthalic crude iji wepụ ihe ndị na-adịghị ọcha, wee kpochaa, kewapụ, nke a mịrị amị ma kwadebere ngwaahịa terephthalic acid a nụchara anụcha, ya bụ, PTA emechara ngwaahịa.
Ntinye ngwaahịa
PTA bụ kristal na-acha ọcha ma ọ bụ ntụ ntụ n'ime ụlọ okpomọkụ, obere nsị na ọkụ.Ya mgbanye ebe bụ 384 ~ 421 °C, sublimation okpomọkụ 98.4kJ / mol, combustion okpomọkụ 3225.9kJ / mol, na njupụta 1.55g / cm3.Ọ bụ soluble na alkali ngwọta, dịtụ soluble na ethanol na-ekpo ọkụ, insoluble na mmiri, ether, glacial acetic acid na chloroform.
Ngwa ngwaahịa
Akụrụngwa dị mkpa maka imepụta eriri polyester, ihe nkiri, ngwaahịa rọba, agba mkpuchi na plastik, a na-ejikwa ya dị ka etiti agba agba.
PTA bụ otu n'ime ihe dị mkpa nnukwu akụrụngwa akụrụngwa, nke a na-ejikarị na eriri kemịkalụ, ụlọ ọrụ ọkụ, ngwa elektrọn, ihe owuwu na akụkụ ndị ọzọ nke akụ na ụba mba.
Ngwa nke PTA na-etinyekarị uche, ihe karịrị 90% nke PTA ụwa na-eji na-emepụta polyethylene terephthalate (nke a na-akpọ polyester, PET).Iji mepụta 1 ton nke PET, 0.85-0.86 tọn PTA na 0.33-0.34 tọn MEG (ethylene glycol) chọrọ.Polyester gụnyere eriri eriri, eriri polyester, ibe karama na ibe ihe nkiri.Na China, a na-eji 75% nke PTA na-emepụta eriri polyester;A na-eji 20% na-emepụta resin PET ọkwa karama, nke a na-ejikarị na nkwakọ ngwaahịa dị iche iche, karịsịa ihe ọṅụṅụ carbonated;5% maka polyester-ọkwa ihe nkiri, nke a na-ejikarị na ihe nkwakọ ngwaahịa, ihe nkiri na teepu.Ya mere, ngwaahịa ala nke PTA na-abụkarị polyester fiber.
