Qhov sib txawv tseem ceeb ntawm phthalic acid thiab terephthalic acid yog tias phthalic acid yog ib qho isomer ntawm benzenedicarboxylic acid muaj cov pab pawg ua haujlwm hauv txoj haujlwm ortho, whereas terephthalic acid yog ib qho isomer ntawm benzenedicarboxylic acid muaj cov pab pawg ua haujlwm nyob rau hauv txoj haujlwm para.
Benzenedicarboxylic acid tuaj yeem piav qhia raws li ib pawg ntawm cov tshuaj sib txuas uas muaj ob pawg carboxylic acid ua haujlwm txuas nrog lub nplhaib benzene, yog li peb tuaj yeem hu rau lawv dicarboxylic derivatives ntawm benzene. Peb hom isomeric ntawm chav kawm no suav nrog phthalic acid, isophthalic acid, thiab terephthalic acid.
Phthalic Acid yog dab tsi?
Phthalic acid tuaj yeem piav qhia tias yog ib qho tshuaj tsw qab dicarboxylic acid uas muaj cov tshuaj formula C6H4(COOH) 2 Qhov sib thooj phthalic anhydride yog hom phthalic acid feem ntau, muaj kev siv tseem ceeb. Nws yog ib qho khoom siv tshuaj uas tsim los ntawm qhov loj. Qhov no acidic compound yog ib qho ntawm peb isomers ntawm benzenedicarboxylic acid. Lwm ob isomers yog isophthalic acid thiab terephthalic acid.
Daim duab 01: Cov Qauv Tshuaj ntawm Phthalic Acid
Cov tshuaj no zoo li cov khoom dawb, thiab nws qhov ceev yog li 1.59 g / mol. Nws muaj qhov melting point ntawm 207 degrees Celsius, thiab nws cov solubility hauv dej tsis zoo. Lwm cov npe tshuaj rau phthalic acid suav nrog 1, 2-benzenedioic acid, benzene-1, 2-dioic acid, ortho-phthalic acid, thiab lwm yam.
Peb tuaj yeem tsim phthalic acid los ntawm catalytic oxidation ntawm naphthalene lossis ortho-xylene. Qhov no ncaj qha tsim phthalic anhydride. Nws cov hydrolysis tom qab kuj tuaj yeem tshwm sim hauv anhydride.
Cov tshuaj lom neeg no yog thawj zaug los ntawm Fab Kis Chemist Auguste Laurent hauv xyoo 1836. Qhov no tau ua los ntawm oxidizing naphthalene tetrachloride. Nws ntseeg tias qhov sib xyaw ua ke los ntawm cov tshuaj tiv thaiv no los ua ib qho naphthalene derivative, uas coj nws mus rau npe rau nws naphthalic acid. Txawm li cas los xij, lub npe tshuaj raug kho tom qab los ntawm Swiss chemist, Jean Charles Galissard de Marignac.
Terephthalic Acid yog dab tsi?
Terephthalic acid yog ib qho tshuaj tsw qab uas muaj cov tshuaj formula C6H4(CO2 H)2 Nws muaj qhov sib txawv. Nws tshwm sim li dawb crystalline hmoov. Ntxiv mus, nws yog insoluble nyob rau hauv dej tab sis soluble nyob rau hauv polar organic solvents. Lub npe tshuaj ntawm cov tshuaj no yog 1, 4-benzenedicarboxylic acid.
Daim duab 02: Cov Qauv Tshuaj ntawm Terephthalic Acid
Thaum xav txog kev tsim cov terephthalic acid, cov txheej txheem loj yog cov txheej txheem Amoco. 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.
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 Phthalic Acid thiab Terephthalic Acid yog dab tsi?
Phthalic acid thiab terephthalic acid yog ob lub isomers loj ntawm benzenedicarboxylic acid compounds. Qhov sib txawv tseem ceeb ntawm phthalic acid thiab terephthalic acid yog tias phthalic acid yog ib qho tseem ceeb ntawm cov organic compound thiab ib qho isomer ntawm benzenedicarboxylic acid muaj cov pab pawg ua haujlwm nyob rau hauv txoj hauj lwm ortho whereas terephthalic acid yog ib qho tseem ceeb organic compound thiab ib qho isomer ntawm benzenedicarboxylic acid muaj cov pab pawg ua haujlwm hauv lub para position.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm phthalic acid thiab terephthalic acid.
Summary – Phthalic Acid vs Terephthalic Acid
Benzenedicarboxylic acid yog ib pawg ntawm cov tshuaj sib txuas uas muaj ob pawg carboxylic acid ua haujlwm txuas nrog lub nplhaib benzene. Phthalic acid thiab isophthalic acid yog ob ntawm lawv cov ntawv isomeric. Yog li, qhov sib txawv tseem ceeb ntawm phthalic acid thiab terephthalic acid yog tias phthalic acid muaj nws cov pab pawg ua haujlwm nyob rau hauv txoj hauj lwm ortho, whereas terephthalic acid muaj nws cov pab pawg ua haujlwm nyob rau hauv txoj hauj lwm para.
