Qhov sib txawv tseem ceeb ntawm THF thiab dioxane yog tias THF molecules muaj ib qho oxygen atom ua ib tug tswv cuab ntawm lub nplhaib qauv whereas dioxane molecule muaj ob atoms oxygen raws li cov tswv cuab ntawm lub nplhaib qauv.
Ob leeg THF thiab dioxane yog cov kuab tshuaj organic uas tseem ceeb hauv kev tshuaj xyuas cov qauv. Cov qauv no yog cov qauv cyclic uas peb tuaj yeem faib ua cov sib xyaw heterocyclic vim tias cov qauv nplhaib no muaj ob hom atoms ua lub nplhaib: carbon atoms thiab oxygen atom(s).
THF yog dab tsi?
THF yog cov kuab tshuaj organic uas muaj cov tshuaj formula (CH2)4O. Nws yog ib qho heterocyclic compound, thiab peb tuaj yeem categorize nws li ether vim tias pawg ua haujlwm ntawm THF molecule yog -C-O-C-. Peb tuaj yeem soj ntsuam THF ua cov kua dej tsis muaj xim uas tsis muaj dej. Cov kuab tshuaj no muaj cov ntxhiab tsw zoo li ether. Nws tseem muaj viscosity tsawg. Cov kuab tshuaj no feem ntau yog siv los ua cov txheej txheem ua ntej rau cov txheej txheem polymer synthesis. THF yog ib tug polar molecule uas yuav pab tau sib tov nrog dej. Ntxiv rau qhov no, qhov polarity no ua rau THF ua ntau yam hnyav.
Daim duab 01: THF Solvent
Thaum xav txog cov ntawv thov ntawm THF hnyav, nws tseem ceeb hauv cov txheej txheem polymerization; Nyob rau hauv lub xub ntiag ntawm muaj zog acids, THF hloov mus rau hauv ib tug linear polymer khoom, poly (tetramethylene ether) glycol los yog PTMEG. Cov khoom siv polymer no muaj txiaj ntsig zoo hauv kev tsim cov elastomeric polyurethane fibers xws li spandex.
Tsis tas li ntawd, THF yog qhov tseem ceeb ua cov kuab tshuaj rau PVC thiab hauv cov kua roj vanish. Qhov no yog vim THF yog cov kuab tshuaj aprotic muaj qhov dielectric tas li ntawm 7.6. Peb tuaj yeem faib cov THF ua cov kuab tshuaj nruab nrab ntawm cov polar hnyav uas tuaj yeem yaj ntau yam tsis muaj polar thiab cov tshuaj tiv thaiv polar.
Ntxiv mus, THF yog qhov tseem ceeb ua ib feem ntawm lub sijhawm txawb rau kev hloov pauv-theem kua chromatography. THF yog siv nyob rau hauv cov txheej txheem no vim hais tias nws muaj ib tug zoo elution zog tshaj methanol los yog acetonitrile, tab sis tsis tshua siv tshaj cov kuab tshuaj.
Dioxane yog dab tsi?
Dioxane yog heterocyclic organic compound uas muaj cov tshuaj formula C4H8O2. Peb tuaj yeem faib nws ua ether uas muaj ob pawg -C-O-C- ether. Nws tshwm sim raws li cov kua tsis muaj xim uas muaj cov ntxhiab tsw zoo li ether. Muaj peb lub isomers ntawm dioxane li 1, 2-dioxane, 1, 3-dioxane, thiab 1, 4-dioxane. Ntawm peb lub tebchaw no, 1, 4-dioxane yog qhov sib xyaw ua ke uas lwm cov tebchaw tsis tshua pom.
Daim duab 02: Cov qauv ntawm Dioxane Molecule
Thaum xav txog kev sib txuas, dioxane tuaj yeem tsim los ntawm cov kua qaub-catalyzed lub cev qhuav dej ntawm diethylene glycol. Peb tuaj yeem tau txais diethylene glycol los ntawm hydrolysis ntawm ethylene oxide. Cov kua no yog miscible nrog dej vim nws yog polar.
Dioxane yog ib qho tseem ceeb hauv kev thauj mus los ntawm trichloroethane ua tus stabilizer. Ntxiv mus, nws yog ib qho tseem ceeb raws li ib qho aprotic hnyav rau inks, adhesives, thiab cellulose esters. Peb tuaj yeem siv cov kuab tshuaj no hloov los ntawm THF hauv qee cov txheej txheem vim muaj cov tshuaj lom neeg tsawg thiab kub kub ntawm dioxane hnyav.
Qhov txawv ntawm THF thiab Dioxane yog dab tsi?
Ob leeg THF thiab dioxane yog cov kuab tshuaj organic uas tseem ceeb hauv kev tshuaj xyuas cov qauv. Qhov sib txawv tseem ceeb ntawm THF thiab dioxane yog tias THF molecules muaj ib qho oxygen atom ua ib tug tswv cuab ntawm lub nplhaib qauv whereas dioxane molecule muaj ob lub pa oxygen atom ua cov tswv cuab ntawm lub nplhaib qauv. Peb tuaj yeem siv dioxane los hloov THF vim tias tsis muaj tshuaj lom thiab kub kub.
Hauv qab infographic qhia ntau cov ntsiab lus ntawm qhov sib txawv ntawm THF thiab dioxane.
Summary – THF vs Dioxane
Ob leeg THF thiab dioxane yog cov kuab tshuaj organic uas tseem ceeb hauv kev tshuaj xyuas cov qauv. Qhov sib txawv tseem ceeb ntawm THF thiab dioxane yog tias THF molecules muaj ib qho oxygen atom ua ib tug tswv cuab ntawm lub nplhaib qauv whereas dioxane molecule muaj ob atoms oxygen raws li cov tswv cuab ntawm lub nplhaib qauv.
