Qhov txawv ntawm glycol thiab glyoxal yog glycol yog ib qho aliphatic diol, whereas glyoxal yog dialdehyde ethanedial muab los ntawm ethylene glycol.
Txawm hais tias cov ntsiab lus glycol thiab glyoxal suab zoo ib yam, lawv yog ob hom tshuaj sib xyaw nrog cov qauv tshuaj sib txawv thiab cov khoom.
YGlycol yog dab tsi?
A glycol yog cawv nrog ob pawg OH txuas rau cov pa roj carbon atoms uas nyob ib sab. Qhov tseem ceeb tshaj plaws glycol yog 1, 2-ethanediol, uas yog cov kua qab zib, tsis muaj xim, thiab viscous kua. Qhov no yog qhov yooj yim glycol hauv pab pawg no, thiab nws feem ntau hu ua ethylene glycol. Yog li ntawd, lo lus glycol feem ntau yog siv los ua lub npe no ua ib lo lus.
Glycols, tshwj xeeb tshaj yog ethylene glycol, feem ntau yog siv los ua cov tshuaj tiv thaiv kab mob hauv tsheb, cov dej nres, HVAC systems, thiab hauv qee cov tib neeg tsim fibers. Ethylene glycol yog cawv muaj cov tshuaj formula C2H6O2. Lub npe IUPAC ntawm cov tshuaj no yog ethane-1, 2-diol. Nyob rau hauv chav tsev kub thiab siab, nws yog ib tug tsis muaj kob, tsis muaj ntxhiab kua uas qab zib-tasting thiab viscous. Cov kua no yog tshuaj lom neeg tsawg. Cov molar loj ntawm ethylene glycol yog 62 g / mol. Lub melting point ntawm cov kua no yog -12.9 ° C, thiab lub boiling point yog 197.3 ° C. Ethylene glycol yog miscible nrog dej vim nws muaj -OH pawg uas muaj peev xwm tsim hydrogen bonds.
Daim duab 01: Cov qauv ntawm Ethylene Glycol
Muaj ob txoj hauv kev tsim cov ethylene glycol: kev tsim khoom lag luam thiab kev lom neeg. Hauv kev tsim khoom lag luam, ethylene glycol yog tsim los ntawm ethylene. Ethylene hloov mus rau hauv ethylene oxide, uas tom qab ntawd hloov mus rau hauv ethylene glycol los ntawm cov tshuaj tiv thaiv ntawm ethylene oxide thiab dej. Cov tshuaj tiv thaiv no yog catalyzed los ntawm acids lossis bases. Yog tias cov tshuaj tiv thaiv ua tiav hauv qhov nruab nrab uas muaj pH nruab nrab, ces cov tshuaj tiv thaiv sib xyaw yuav tsum tau muab nrog lub zog kub. Txoj kev lom neeg ntawm kev tsim cov ethylene glycol yog los ntawm kev degradation ntawm polyethylene los ntawm plab kab mob ntawm kab ntsig ntawm Greater wax moth.
YGlyoxal yog dab tsi?
Glyoxal yog cov organic compound uas muaj cov tshuaj formula OCHCHO. Nws tuaj yeem raug txheeb xyuas tias qhov tsawg tshaj plaws dialdehyde muaj ob pawg aldehyde. Cov tshuaj no tshwm sim raws li ib tug dawb crystalline khoom nyob rau hauv qis kub. Nws tshwm nyob rau hauv cov xim daj ntawm qhov kub thiab txias ze ntawm lub melting point. Lub vapor ntawm cov khoom no yog xim ntsuab.
Daim duab 02: Cov Qauv Tshuaj ntawm Glyoxal
Feem ntau, nws nyuaj rau nrhiav glyoxal ntshiab vim tias nws feem ntau yog ua raws li 40% aqueous tov. Yog li, muaj ntau cov hydrates ntawm glyoxal uas yuav suav nrog oligomers thiab. Feem ntau, cov hydrated oligomers coj zoo li glyoxal. Kev lag luam, glyoxal yog tsim los ua tus thawj coj rau ntau lwm yam khoom.
Daim duab 03: Kev Npaj Ua Lag Luam ntawm Glyoxal
Thaum xav txog cov txheej txheem tsim khoom ntawm glyoxal, nws tau npaj ua ntej los ntawm German-British chemist Heinrich Debus los ntawm cov tshuaj tiv thaiv ntawm ethanol thiab nitric acid. Txawm li cas los xij, nyob rau hauv cov txheej txheem niaj hnub no, cov khoom no yog ua lag luam los ntawm cov roj theem oxidation ntawm ethylene glycol nyob rau hauv muaj cov nyiaj los yog tooj liab catalyst los yog los ntawm cov kua theem oxidation ntawm acetaldehyde nrog nitric acid.
Qhov txawv ntawm Glycol thiab Glyoxal yog dab tsi?
Glycol thiab glyoxal yog cov organic tebchaw uas tseem ceeb heev hauv cov txheej txheem tshuaj lom neeg. Qhov sib txawv tseem ceeb ntawm glycol thiab glyoxal yog glycol yog ib qho aliphatic diol, whereas glyoxal yog dialdehyde ethanedial muab los ntawm ethylene glycol.
Cov duab hauv qab no nthuav tawm qhov sib txawv ntawm glycol thiab glyoxal hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Glycol vs Glyoxal
Glycol yog cawv nrog ob pawg OH txuas rau cov pa roj carbon atoms uas nyob ib sab. Txawm li cas los xij, glyoxal tuaj yeem piav qhia raws li cov organic compound uas muaj cov tshuaj formula OCHCHO. Qhov sib txawv tseem ceeb ntawm glycol thiab glyoxal yog glycol yog ib qho aliphatic diol, whereas glyoxal yog dialdehyde ethanedial muab los ntawm ethylene glycol.
