PTA (Asiidh Terephthalic oo Saafi ah)
Habka wax soo saarka alaabta
PTA waa dhamaadka hoose ee batroolka.Batroolka waxa uu maraa hab gaar ah si loo soo saaro naphtha (sidoo kale loo yaqaano gaaska fudud), kaas oo laga soo saaro MX (xylene mixed xylene), ka dibna PX (paraxylene) la soo saaro.PTA waxay u isticmaashaa PX walxo ceeriin ah iyo aashitada acetic sida dareere ahaan, waxaana oxidized hawo iyada oo hoos timaada ficilka kicinta si ay u dhaliso asiidh terephthalic cayriin.Kadibna terephthalic acid ceeriin ayaa la nadiifiyaa si looga saaro wasakhda, ka dibna la miiray, la kala soocay, la qalajiyey oo la diyaariyey alaabada terephthalic acid ee la safeeyey, taas oo ah, alaabta PTA dhammaysay.
hordhaca alaabta
PTA waa crystal cad ama budo heerkulka qolka ah, sun yar oo guban karta.Barta shididu waa 384 ~ 421 °C, kulaylka sublimation 98.4kJ/mol, kulaylka gubashada 3225.9kJ/mol, iyo cufnaanta 1.55g/cm3.Waxay ku milmi kartaa xalalka alkali, wax yar bay ku milmi kartaa ethanol kulul, aan lagu milmi karin biyaha, ether, glacial acetic acid iyo chloroform.
Codsiga alaabta
Qalabka muhiimka ah ee ceeriin ee soo saarista fiilooyinka polyester-ka, filimada, badeecooyinka balaastikada ah, rinjiga dahaadhka ah iyo balaastikada, waxaana sidoo kale loo isticmaalaa dhex dhexaadinta dheeha.
PTA waa mid ka mid ah alaabta ceeriin ee bulk organic ah, oo si ballaaran loogu isticmaalo fiber kiimikaad, warshadaha iftiinka, elektiroonigga, dhismaha iyo qaybaha kale ee dhaqaalaha qaranka.
Codsiga PTA waa mid xoog badan, in ka badan 90% PTA-da adduunka ayaa loo isticmaalaa soo saarista polyetylen terephthalate (oo loo yaqaan polyester, PET).Si loo soo saaro 1 tan oo PET ah, 0.85-0.86 tan oo PTA ah iyo 0.33-0.34 tan oo MEG (etylene glycol) ayaa loo baahan yahay.Polyester-ka waxaa ka mid ah jajabyada fiber-ka, fiilooyinka polyester-ka, jajabyada dhalada iyo jajabyada filimada.Shiinaha, 75% PTA waxaa loo isticmaalaa in lagu soo saaro fiber polyester;20% waxaa loo isticmaalaa soo saarista xabagta PET-ga dhalada, inta badan waxaa loo isticmaalaa baakadaha cabitaanada kala duwan, gaar ahaan cabitaanada kaarboonaysan;5% ee polyester-ka-filimka, oo inta badan loo isticmaalo baakadaha alaabta, filimada iyo cajaladaha.Sidaa darteed, alaabada hoose ee PTA waxay u badan yihiin fiber polyester.
