Chaw tsim tshuaj paus Zoo Nqe Stearic acid CAS: 57-11-4

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Stearic acid: (qib kev lag luam) Octadecanoic acid, C18H36O2, yog tsim los ntawm hydrolysis ntawm roj thiab yog siv nyob rau hauv zus tau tej cov stearate.
Stearic Acid-829 Stearic acid, Stearic acid yog cov roj fatty acid tau los ntawm cov tsiaj thiab zaub rog, cov khoom tseem ceeb ntawm cov stearic acid (C18H36O2) thiab palmitic acid (C16H32O2).
Cov khoom no yog dawb los yog dawb zoo li hmoov los yog crystalline nyuaj block, nws profile muaj microstrip luster zoo koob siv lead ua;Nws muaj ib tug me ntsis tsw zoo li roj thiab yog tasteless.Cov khoom no yog soluble hauv chloroform lossis diethyl ether, yaj hauv ethanol, yuav luag insoluble hauv dej.Lub freezing point Qhov chaw khov (Appendix Ⅵ D) ntawm cov khoom yuav tsum tsis txhob qis dua 54 ℃.Tus nqi iodine Tus nqi iodine ntawm cov khoom no (Appendix Ⅶ H) tsis ntau tshaj 4. Acid Value (Appendix Ⅶ H) ntawm cov khoom no yog li ntawm 203 txog 210. Stearate nkag siab nrog magnesium thiab calcium ions los tsim magnesium stearate thiab calcium stearate. (white precipitate)
Stearic acid CAS 57-11-4
Khoom npe: Stearic acid

CAS: 57-11-4 Nr

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Synonyms

ACIDUM STEARICUM 50; CETYLACETIC ACID; FEMA 3035; CARBOXYLIC ACID C18; C18; C18: 0 FATTY ACID; hystrene 5016; hystrene7018

Kev siv ntawm Stearic acid

Stearic acid, (qib kev lag luam) Stearic acid yog ib qho ntawm ntau cov kab mob ntev fatty acids uas muaj cov roj thiab cov rog.Nws tau nthuav tawm hauv cov tsiaj rog, roj thiab qee yam roj zaub zoo li hauv daim ntawv ntawm glycerides.Cov roj no, tom qab hydrolysis, tsim cov stearic acid.
Stearic acid yog cov roj ntsha uas muaj nyob hauv cov xwm txheej thiab muaj cov tshuaj lom neeg ntawm carboxylic acids.Yuav luag txhua hom roj thiab roj muaj qee qhov nyiaj stearic acid nrog cov ntsiab lus ntawm cov tsiaj rog yog cov txheeb ze siab.Piv txwv li, cov ntsiab lus hauv butter tuaj yeem ncav cuag 24% thaum cov ntsiab lus hauv cov roj zaub yog cov txheeb ze nrog tus nqi hauv cov tshuaj yej roj yog 0.8% thiab cov roj hauv xibtes yog 6%.Txawm li cas los xij, cov ntsiab lus hauv cocoa tuaj yeem ncav cuag li 34%.

Muaj ob txoj hauv kev loj rau kev tsim khoom ntawm stearic acid, uas yog fractionation thiab compression txoj kev.Ntxiv cov decomposition tus neeg sawv cev rau cov roj hydrogenated, thiab tom qab ntawd hydrolyze muab cov roj fatty acid, ntxiv mus los ntawm kev ntxuav nrog dej, distillation, bleaching kom tau cov khoom tiav nrog glycerol raws li cov byproduct.
Feem ntau cov tuam txhab lag luam hauv tsev siv tsiaj rog rau kev tsim khoom.Qee hom kev siv tshuab yuav ua rau tsis tiav ntawm cov distillation ntawm fatty acid uas tsim stimulating tsw thaum lub sij hawm ntawm cov yas ua thiab kub kub.Txawm hais tias cov ntxhiab tsw no tsis muaj tshuaj lom tab sis lawv yuav muaj qee yam cuam tshuam rau kev ua haujlwm thiab ib puag ncig ntuj.Feem ntau cov ntaub ntawv tuaj ntawm stearic acid siv cov roj zaub ua cov khoom siv raw, cov txheej txheem ntau lawm yog qib siab dua;cov stearic acid uas ua tau ruaj khov, zoo lubrication khoom thiab tsis muaj ntxhiab tsw nyob rau hauv daim ntawv thov.
Stearic acid feem ntau yog siv rau kev tsim cov stearates xws li sodium stearate, magnesium stearate, calcium stearate, txhuas stearate, txhuas stearate, cadmium stearate, hlau stearate, thiab potassium stearate.Cov sodium los yog potassium ntsev ntawm stearic acid yog cov khoom ntawm xab npum.Txawm hais tias sodium stearate muaj peev xwm decontamination tsawg dua li sodium palmitate, tab sis nws lub xub ntiag tuaj yeem ua rau muaj zog ntawm xab npum.
Siv butter ua raw khoom, mus rau sulfuric acid los yog pressurized txoj kev rau decomposition.Cov fatty acids dawb yog thawj zaug rau cov dej siab rau kev tshem tawm cov palmitic acid thiab oleic acid ntawm 30 ~ 40 ℃, thiab tom qab ntawd yaj hauv ethanol, tom qab ntawd ntxiv cov barium acetate lossis magnesium acetate uas precipitates stearate.Tom qab ntawd ntxiv ntxiv dilute sulfuric acid kom tau txais cov dawb stearate acid, lim thiab coj nws, thiab rov ua kom rov ua dua tshiab hauv ethanol kom tau txais cov ntshiab stearic acid.