Qhov sib txawv tseem ceeb ntawm isophthalic acid thiab terephthalic acid yog tias isophthalic acid muaj nws ob pawg carboxylic acid sib cais los ntawm ib lub atom carbon. Whereas, terephthalic acid muaj nws ob pawg carboxylic acid sib cais los ntawm ob lub atoms.
Isophthalic acid thiab terephthalic acid yog cov organic tebchaw uas muaj ntxhiab carboxylic acids uas muaj ob pawg -COOH ib molecule.
YIsophthalic Acid yog dab tsi?
Isophthalic acid yog ib qho tshuaj tsw qab uas muaj cov tshuaj formula C6H4(CO2 H)2 thiab meta conformation. Cov molar loj ntawm cov tshuaj no yog 166 g / mol. Tsis tas li ntawd, nws tshwm sim raws li cov xim tsis muaj xim. Isophthalic acid yog ib qho isomer ntawm phthalic acid thiab terephthalic acid.
Thaum xav txog cov txheej txheem tsim khoom, peb tuaj yeem tsim cov isophthalic acid ntawm oxidizing meta-xylene nyob rau hauv lub xub ntiag ntawm oxygen. Qhov no yog txheej txheem kev tsim khoom lag luam. Tsis tas li ntawd, cov txheej txheem no yuav tsum muaj cov catalyst xws li cob alt-manganese catalyst. Txawm li cas los xij, peb tuaj yeem tsim cov isophthalic acid hauv chav kuaj los ntawm fusion ntawm potassium meta-sulfobenzoate nrog potassium formate nyob rau hauv lub xub ntiag ntawm chromic acid.
Ntxiv mus, isophthalic acid yog ib qho tshuaj tsw qab. Thiab, nws yog tsim los ntawm lub nplhaib benzene nrog ob pawg carboxylic acid hloov mus rau lub nplhaib. Ntawm no, ib pawg carboxylic acid nyob rau hauv meta txoj hauj lwm piv rau lwm pawg carboxylic acid. Yog li ntawd, ob pawg neeg ua haujlwm tau sib cais los ntawm ib leeg los ntawm ib qho carbon atom ntawm lub nplhaib.
Daim duab 01: Cov Qauv Tshuaj ntawm Isophthalic Acid
Dhau li ntawm, isophthalic acid yog insoluble hauv dej. Kev siv loj ntawm qhov sib xyaw no yog tsim los ntawm PET lossis polyethylene terephthalate cov khoom siv polymer uas muaj txiaj ntsig zoo li cov resin. Tsis tas li ntawd, peb tuaj yeem siv nws rau kev tsim cov khoom siv tsis zoo polyester lossis UPR.
Terephthalic Acid yog dab tsi?
Terephthalic acid yog ib qho tshuaj tsw qab uas muaj cov tshuaj formula C6H4(CO2 H)2 and para conformation. Nws tshwm sim li dawb crystalline hmoov. Tsis tas li, nws yog insoluble hauv dej tab sis soluble hauv polar organic solvents.
Thaum xav txog kev tsim cov terephthalic acid, cov txheej txheem loj yog Amoco txheej txheem. Ntawm no, cov kua qaub yog tsim los ntawm oxidation ntawm p-xylene nyob rau hauv lub xub ntiag ntawm oxygen nyob rau hauv cov huab cua. Cov tshuaj tiv thaiv yog raws li nram no:
Daim duab 02: Cov txheej txheem tsim khoom ntawm Terephthalic Acid
Dhau li ntawm, hais txog cov ntawv thov, muaj ntau yam kev siv terephthalic acid. Piv txwv li, nws yog ib qho tseem ceeb raws li ib tug precursor rau PET ntau lawm (polyethylene terephthalate), siv nyob rau hauv cov xim raws li ib tug carrier compound, raws li ib tug raw khoom rau tej yam tshuaj nyob rau hauv kev siv tshuaj, raws li ib tug muab tub lim nyob rau hauv tej yam tub rog grenades, thiab lwm yam.
Qhov txawv ntawm Isophthalic Acid thiab Terephthalic Acid yog dab tsi?
Qhov sib txawv tseem ceeb ntawm isophthalic acid thiab terephthalic acid yog tias isophthalic acid muaj nws ob pawg carboxylic acid sib cais los ntawm ib lub atom carbon. Whereas, terephthalic acid muaj nws ob pawg carboxylic acid sib cais los ntawm ob lub atoms. Tsis tas li ntawd, isophthalic acid yog ib qho tshuaj tsw qab uas muaj cov tshuaj formula C6H4(CO2H.)2 thiab meta conformation, thaum terephthalic acid yog ib qho aromatic organic compound uas muaj cov tshuaj formula C6H4 (CO2H)2 and para conformation.
Hauv qab infographic qhia cov ncauj lus kom ntxaws ntxiv ntawm qhov sib txawv ntawm isophthalic acid thiab terephthalic acid.
Summary – Isophthalic Acid vs Terephthalic Acid
Isophthalic acid thiab terephthalic acid yog cov organic tebchaw uas muaj ntxhiab carboxylic acids uas muaj ob pawg -COOH ib molecule. Qhov sib txawv tseem ceeb ntawm isophthalic acid thiab terephthalic acid yog tias isophthalic acid muaj nws ob pawg carboxylic acid sib cais los ntawm ib qho atom carbon. Tab sis, terephthalic acid muaj nws ob pawg carboxylic acid sib cais los ntawm ob lub atoms.
