Qhov sib txawv tseem ceeb ntawm isopropyl thiab rubbing cawv yog tias cov cawv cawv yog cov sib xyaw ua ke thaum isopropyl cawv (2-propanol) tsis yog sib xyaw.
Peb tuaj yeem faib cov isopropyl cawv thiab rub cov cawv hauv qab pawg cawv vim lawv muaj -OH pawg. Cov no yog cov cawv me me hauv koob nrog ob lossis peb carbons. Pab pawg OH txuas rau sp3 hybridized carbon. Ob leeg yog cov kua polar thiab muaj peev xwm tsim cov hydrogen bonds. Yog li ntawd, ob qho tib si muaj qee qhov zoo sib xws ntawm lub cev thiab tshuaj lom neeg xws li ob qho tib si yog cov nplaim taws thiab cov kua dej lom.
Isopropyl cawv yog dab tsi?
Isopropyl cawv nrog cov tshuaj npe 2-propanol muaj tib lub qauv molecular li propanol. Qhov hnyav molecular ntawm nws yog nyob ib ncig ntawm 60 g mol-1 Cov mis mos molecular yog C3H8O. Yog li, isopropyl cawv yog ib qho isomer ntawm propanol. Cov pab pawg hydroxyl ntawm cov molecule no txuas rau lub thib ob carbon atom hauv cov saw hlau. Yog li ntawd, qhov no yog ib qho cawv thib ob. Lub melting point ntawm isopropyl cawv yog -88 ◦C thaum lub boiling point yog 83 ◦C.
Daim duab 01: Cov qauv tshuaj ntawm Isopropyl cawv
Isopropyl cawv yog miscible nrog dej thiab ruaj khov nyob rau hauv ib txwm muaj. Tsis tas li ntawd, qhov no yog xim tsis muaj xim, ntshiab, flammable kua uas muaj ntxhiab tsw. Txij li qhov no yog ib qho cawv thib ob, nws nkag mus rau txhua qhov kev cuam tshuam rau cov cawv thib ob. Tsis tas li ntawd, nws oxidizes hnyav los tsim acetone. Cov cawv no muaj txiaj ntsig zoo li cov kuab tshuaj, hauv tshuaj, khoom siv hauv tsev, cov khoom tu tus kheej thiab ua lwm yam tshuaj.
Yuav Dej Cawv yog dab tsi?
Rubbing cawv yog hom cawv denatured. Nws muaj 70-95% ethanol thiab lwm yam additives. Yog li ntawd, nws yog heev lom thiab tsis haum rau noj. Nws yog tshwj xeeb tshaj yog pab tau raws li ib tug tshuaj tua kab mob rau tib neeg daim tawv nqaij. Nws tseem yog ib qho tseem ceeb hauv kev tu cov cuab yeej kho mob kom lawv tsis txhob muaj kab mob thiab cov kab mob fungal. Lwm yam tshaj li ib txwm rubbing cawv, muaj lwm yam hu ua isopropyl rubbing cawv, uas feem ntau yog isopropyl cawv. Peb siv nws ua cov kuab tshuaj los yog tshuaj ntxuav.
Daim duab 02: Ib lub raj mis ntawm Cawv Cawv
Denatured cawv yog ethanol nrog rau lwm yam additives, uas ua rau nws tsis zoo rau haus. Peb lub npe hu ua methylated dab vim hais tias ua ntej, lub ntsiab additive rau qhov no yog methanol uas yog hais txog 10%. Lwm yam tshaj li methanol, tib neeg tau ntxiv lwm cov tshuaj ntxiv xws li isopropyl cawv, acetone, methyl ethyl ketone, methyl isobutyl ketone, thiab denatonium los ua cawv denatured. Ntxiv cov molecules ntxiv no tsis cuam tshuam rau cov tshuaj lom neeg ntawm ethanol tab sis ua rau nws lom heev. Qee zaum denatured cawv tej zaum yuav muaj xim vim yog ntxiv cov dyes. Txij li thaum rubbing cawv kuj yog ib hom cawv denatured, nws kuj qhia tau hais tias cov khoom saum toj no thiab cov xim sib txawv. Ntxiv mus, lub melting point ntawm cov cawv no txawv raws li qhov feem ntawm isopropyl cawv tam sim no; melting point ranges ntawm 80 ° C mus rau 83 ° C thaum boiling point ranges ntawm -32 ° C mus -50 ° C.
Qhov txawv ntawm Isopropyl thiab Rubbing Cawv yog dab tsi?
Isopropyl cawv nrog cov tshuaj npe 2-propanol muaj tib lub qauv molecular li propanol thaum rubbing cawv yog hom cawv denatured. Txawm hais tias ob qho tib si yog cov tshuaj yeeb dej caw, lawv muaj qhov sib txawv; Qhov sib txawv tseem ceeb ntawm isopropyl thiab rubbing cawv yog nyob rau hauv lawv cov tshuaj muaj pes tsawg leeg. Isopropyl cawv yog ib qho kev sib xyaw ua ke thaum rub dej cawv yog sib xyaw ntawm ntau lub tebchaw. Ntxiv mus, kuj muaj qee qhov sib txawv ntawm isopropyl thiab rubbing cawv hauv lawv cov tshuaj lom neeg; Piv txwv li, lub melting point ntawm isopropyl cawv yog -88 ◦C thaum lub boiling point yog 83 ◦C. Tab sis rau rubbing cawv, lub melting point yog li ntawm 80 ° C mus rau 83 ° C thaum boiling point yog li ntawm -32 ° C mus rau -50 ° C.
Cov duab hauv qab no nthuav tawm qhov sib txawv ntawm isopropyl thiab rubbing cawv hauv daim ntawv tabular.
Summary – Isopropyl vs Rubbing Cawv
Cawv yog cov tshuaj lom neeg muaj -OH pab pawg ua haujlwm tseem ceeb. Isopropyl thiab rubbing cawv yog ob hom cawv. Qhov sib txawv tseem ceeb ntawm isopropyl thiab rubbing cawv yog tias cov cawv cawv yog cov sib xyaw ua ke thaum isopropyl cawv tsis yog sib xyaw.
