Khoom Parameters
Propionic acid (/proʊpiˈɒnɪk/, los ntawm cov lus Greek πρῶτος: prōtos, lub ntsiab lus "thawj", thiab πίων : píōn, lub ntsiab lus "rog"; tseem hu ua propanoic acid) yog ib txwm tshwm sim carboxylic acid nrog tshuaj formula CH3CH2CO2H. Nws yog cov kua uas muaj pungent thiab tsis hnov tsw tsw zoo li lub cev tsw. Anion CH3CH2CO−2nrog rau cov ntsev thiab esters ntawm propionic acid yog hu ua propionates los yog propanoates.
|
Yam khoom |
Specification |
|
Qhov tshwm sim |
Colorless ntshiab kua |
|
tsw |
Cov ntxhiab tsw ntxhiab tsw |
|
Purity |
Ntau dua lossis sib npaug li 99.5% |
|
Evaporation residue, w/% |
Tsawg dua lossis sib npaug rau 0.01 |
|
Relative ceev (25ºC) |
0.993-0.997 |
|
Dej, w/% |
Tsawg dua lossis sib npaug rau 0.15 |
|
Heavy hlau (Pb mg / kg) |
Tsawg dua lossis sib npaug rau 2.0 |
|
Raws li (mg / kg) |
Tsawg dua los yog sib npaug rau 3.0 |
Daim ntawv thov
Propionic acid muaj ntau yam kev siv. Nws tuaj yeem siv rau hauv kev lag luam khoom noj los tsim cov tshuaj tiv thaiv xws li calcium propionate thiab sodium propionate, thiab tseem tuaj yeem siv los tsim propionate ester flavours thiab fragrances. Pharmaceutical intermediates ntawm tshuaj tua kab thiab preservatives rau ntsuab pub kuj siv tau.
Cia
1). Kev Tiv Thaiv Kev Tiv Thaiv Cia Cia hauv qhov chaw txias, qhov cua txias.
2). Khaws kom deb ntawm qhov hluav taws kub thiab cua sov. Khaws ntawm qhov kub tsis tshaj 32 degree thiab qhov txheeb ze av noo tsis tshaj 80%.
3). Khaws lub thawv kaw. Nws yuav tsum tau muab cais los ntawm cov neeg ua haujlwm oxidizing, txo cov neeg ua haujlwm thiab alkalis, thiab yuav tsum tsis txhob sib xyaw.
4). Siv cov khoom tawg-pov thawj hom teeb pom kev zoo thiab qhov cua qhov chaw.
5). Txwv tsis pub siv cov khoom siv hluav taws xob thiab cov cuab yeej siv hluav taws xob. Qhov chaw cia khoom yuav tsum tau nruab nrog cov khoom siv kho mob thaum muaj xwm txheej ceev thiab cov khoom siv vaj tse tsim nyog.
Keeb kwm
Propionic acid tau piav qhia thawj zaug hauv xyoo 1844 los ntawm Johann Gottlieb, uas pom nws ntawm cov khoom degradation ntawm qab zib. Nyob rau ob peb xyoos tom ntej no, lwm cov chemists tsim propionic acid los ntawm kev sib txawv, tsis muaj leej twg paub tias lawv tau tsim cov khoom qub. Nyob rau hauv 1847, Fabkis chemist Jean-Baptiste Dumas tsim tag nrho cov acids los ua tib lub compound, uas nws hu ua propionic acid, los ntawm Greek lo lus πρῶτος (prōtos), lub ntsiab lus ua ntej, thiab πίων (piōn), lub ntsiab lus rog, vim hais tias nws yog tus. tsawg tshaj plaws H(CH2) nCOOH cov kua qaub uas nthuav tawm cov khoom ntawm lwm cov fatty acids, xws li tsim cov roj txheej thaum ntsev tawm ntawm dej thiab muaj cov ntsev ntsev ntsev.
Cov khoom
Propionic acid muaj lub cev muaj zog nruab nrab ntawm cov me me carboxylic acids, formic thiab acetic acids, thiab cov fatty acids loj. Nws yog miscible nrog dej, tab sis tuaj yeem tshem tawm ntawm dej los ntawm kev ntxiv ntsev. Raws li nrog acetic thiab formic acids, nws muaj hydrogen bonded khub ntawm molecules nyob rau hauv ob qho tib si kua thiab vapor.
Propionic acid qhia txog cov yam ntxwv ntawm carboxylic acids: nws tuaj yeem tsim amide, ester, anhydride, thiab chloride derivatives. Nws tau dhau los ntawm Hell-Volhard-Zelinsky cov tshuaj tiv thaiv uas koom nrog -halogenation ntawm carboxylic acid nrog bromine, catalysed los ntawm phosphorus tribromide, nyob rau hauv rooj plaub no los tsim 2-bromopropanoic acid, CH3CHBrCOH. Cov khoom no tau raug siv los npaj cov kev sib tw racemic ntawm alanine los ntawm ammonolysis.
Ntim & Shipping
FAQ
Cim npe nrov: Tuam Tshoj propionic acid chaw tsim tshuaj paus cas 79-09-4, Tuam Tshoj propionic acid chaw tsim tshuaj paus CAS 79-09-4 manufacturers, lwm tus neeg
