Chaw Tsim Khoom Zoo Nqe Stearic acid CAS: 57-11-4

Chaw Tsim Khoom Zoo Tus Nqi Stearic acid CAS: 57-11-4 Duab Tshwj Xeeb

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Stearic acid: (qib kev lag luam) Octadecanoic acid, C18H36O2, yog tsim los ntawm hydrolysis ntawm roj thiab feem ntau yog siv rau hauv kev tsim cov stearate
Stearic Acid-829 Stearic acid, Stearic acid yog cov roj fatty acid khov kho uas tau los ntawm cov roj tsiaj thiab cov roj zaub, cov khoom tseem ceeb yog stearic acid (C18H36O2) thiab palmitic acid (C16H32O2).
Cov khoom no yog dawb los yog dawb zoo li hmoov lossis crystalline tawv thaiv, nws cov profile muaj microstrip luster zoo li koob siv lead ua; Nws muaj ib tug me ntsis tsw zoo li roj thiab yog tasteless. Cov khoom no yog soluble nyob rau hauv chloroform los yog diethyl ether, yaj nyob rau hauv ethanol, yuav luag insoluble nyob rau hauv dej. Freezing point Lub freezing point (Ntxiv Ⅵ D) ntawm cov khoom yuav tsum tsis txhob qis dua 54 ℃. Iodine nqi Tus iodine nqi ntawm cov khoom no (Ntxiv Ⅶ H) tsis yog ntau tshaj 4. Acid nqi (Ntxiv Ⅶ H) ntawm cov khoom no yog los ntawm 203 mus rau 210. Stearate yooj yim reacts nrog magnesium thiab calcium ions los ua magnesium stearate thiab calcium stearate (dawb precipitate)
Stearic acid CAS 57-11-4
Lub Npe Khoom: Stearic acid

CAS: 57-11-4

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Cov ntawv thov ntawm Stearic acid

Stearic acid, (qib kev lag luam) Stearic acid yog ib qho ntawm ntau cov roj fatty acids ntev uas muaj roj thiab cov rog. Nws muaj nyob rau hauv cov roj tsiaj, roj thiab qee hom roj zaub zoo li hauv daim ntawv ntawm glycerides. Cov roj no, tom qab hydrolysis, tsim cov stearic acid.
Stearic acid yog ib hom fatty acid uas muaj nyob hauv xwm thiab muaj cov khoom siv tshuaj lom neeg zoo li carboxylic acids. Yuav luag txhua hom rog thiab roj muaj qee yam stearic acid nrog rau cov roj tsiaj ntau. Piv txwv li, cov roj butter muaj txog li 24% thaum cov roj zaub tsawg nrog rau cov roj tshuaj yej muaj 0.8% thiab cov roj txiv laum huab xeeb muaj 6%. Txawm li cas los xij, cov cocoa muaj txog li 34%.

Muaj ob txoj hauv kev tseem ceeb rau kev tsim cov stearic acid hauv kev lag luam, uas yog fractionation thiab compression method. Ntxiv cov tshuaj decomposition rau hauv cov roj hydrogenated, thiab tom qab ntawd hydrolyze kom tau cov roj fatty acid nyoos, tom qab ntawd ntxuav nrog dej, distillation, bleaching kom tau txais cov khoom tiav nrog glycerol ua cov khoom seem.
Feem ntau cov chaw tsim khoom hauv tsev siv cov roj tsiaj rau kev tsim khoom. Qee hom thev naus laus zis tsim khoom yuav ua rau cov roj fatty acid tsis ua tiav uas tsim cov ntxhiab tsw thaum lub sijhawm ua cov yas thiab kub siab. Txawm hais tias cov ntxhiab tsw no tsis muaj tshuaj lom tab sis lawv yuav muaj qee qhov cuam tshuam rau qhov chaw ua haujlwm thiab ib puag ncig ntuj. Feem ntau cov stearic acid uas xa tawm los ntawm txawv teb chaws siv cov roj zaub ua cov khoom siv raw, cov txheej txheem tsim khoom yog qib siab dua; cov stearic acid tsim tawm muaj kev ua haujlwm ruaj khov, cov khoom siv roj zoo thiab tsw tsawg dua thaum siv.
Stearic acid feem ntau yog siv rau kev tsim cov stearates xws li sodium stearate, magnesium stearate, calcium stearate, lead stearate, aluminium stearate, cadmium stearate, iron stearate, thiab potassium stearate. Cov sodium lossis potassium ntsev ntawm stearic acid yog cov khoom xyaw ntawm xab npum. Txawm hais tias sodium stearate muaj peev xwm tshem tawm cov pa phem tsawg dua li sodium palmitate, tab sis nws qhov muaj nyob yuav ua rau xab npum tawv dua.
Siv butter ua raw khoom, mus dhau sulfuric acid lossis txoj kev nias kom tawg ua tej daim me me. Cov roj fatty acid dawb raug nias ua ntej kom tshem tawm palmitic acid thiab oleic acid ntawm 30 ~ 40 ℃, thiab tom qab ntawd yaj rau hauv ethanol, ua raws li ntxiv barium acetate lossis magnesium acetate uas ua rau stearate. Tom qab ntawd ntxiv dilute sulfuric acid kom tau cov stearate dawb, lim thiab coj nws, thiab rov ua dua hauv ethanol kom tau cov stearic acid ntshiab.