PTA (Pure Terephthalic Acid)
Tsarin samar da samfur
PTA shine ƙananan ƙarshen man fetur.Man fetur yana yin wani tsari don samar da naphtha (wanda kuma aka sani da man fetur mai haske), wanda aka fitar da MX (mixed xylene) daga ciki, sa'an nan kuma aka fitar da PX (paraxylene).PTA tana amfani da PX azaman ɗanyen abu da acetic acid azaman ƙauye, kuma iskar oxidized tana ƙarƙashin aikin mai kara kuzari don samar da ɗanyen terephthalic acid.Sannan ana tace danyen terephthalic acid na ruwa don cire datti, sannan a sanya crystallized, a ware, a bushe da kuma shirya kayan terephthalic acid da aka tace, wato PTA da aka gama.
Gabatarwar samfur
PTA farin crystal ne ko foda a dakin da zafin jiki, ƙarancin guba da flammable.Its ƙonewa batu ne 384 ~ 421 ° C, sublimation zafi 98.4kJ / mol, konewa zafi 3225.9kJ / mol, da yawa 1.55g/cm3.Yana da narkewa a cikin maganin alkali, dan kadan mai narkewa a cikin ethanol mai zafi, maras narkewa cikin ruwa, ether, glacial acetic acid da chloroform.
Aikace-aikacen samfur
Muhimman kayan albarkatun don kera zaruruwan polyester, fina-finai, samfuran filastik, fenti masu hana ruwa da filastik, kuma ana amfani da su azaman tsaka-tsakin rini.
PTA na ɗaya daga cikin mahimman kayan albarkatun ƙasa masu girma, ana amfani da su sosai a cikin fiber sunadarai, masana'antar haske, kayan lantarki, gini da sauran fannoni na tattalin arzikin ƙasa.
Aikace-aikacen PTA yana da mahimmanci, fiye da 90% na PTA na duniya ana amfani da shi wajen samar da polyethylene terephthalate (wanda ake kira polyester, PET).Don samar da tan 1 na PET, 0.85-0.86 ton na PTA da 0.33-0.34 ton na MEG (ethylene glycol) ana buƙatar.Polyester ya haɗa da kwakwalwan fiber, zaruruwan polyester, guntun kwalba da guntun fim.A kasar Sin, 75% na PTA ana amfani dashi don samar da fiber polyester;20% ana amfani da shi a cikin samar da resin PET na kwalba, galibi ana amfani dashi a cikin marufi na abubuwan sha daban-daban, musamman abubuwan sha;5% don polyester-sajin fim, galibi ana amfani dashi a cikin kayan marufi, fina-finai da kaset.Sabili da haka, samfuran da ke ƙasa na PTA sun fi polyester fiber.
