Qhov sib txawv tseem ceeb ntawm kev txaus siab thiab kev hloov pauv yog qhov kev txaus siab yog cov tshuaj tiv thaiv ntawm ester thiab cawv kom tau txais cov ester sib txawv, qhov kev hloov pauv yog cov tshuaj tiv thaiv ntawm ester thiab cawv los hloov pawg alkoxy.
Interesterification yog cov txheej txheem biochemical uas qhov kev hloov pauv tshwm sim hauv cov roj fatty acid ntawm cov khoom muaj roj. Transesterification tuaj yeem piav qhia raws li cov txheej txheem muaj txiaj ntsig los hloov kho cov qauv ntawm ester.
Kev txaus siab yog dab tsi?
Interesterification yog cov txheej txheem biochemical uas qhov kev hloov pauv tshwm sim hauv cov roj fatty acid ntawm cov khoom muaj roj. Qhov no feem ntau tshwm sim nrog kev sib xyaw ntawm triglycerides. Cov txheej txheem no tseem ceeb hauv kev lag luam khoom noj. Nws koom nrog kev rhuav tshem thiab hloov kho cov ester bonds uas yog ib qho tseem ceeb hauv kev txuas cov fatty acid chains mus rau glycerol hubs ntawm cov roj molecules. Peb tuaj yeem ua qhov kev txaus siab siv cov khoom siv tsis zoo uas tuaj yeem ua rau cov txiaj ntsig ntawm cov tshuaj lom neeg muaj txiaj ntsig hauv kev lag luam. Yog tias peb siv cov enzymes, peb tuaj yeem hu nws qhov kev txaus siab enzymatic.
Daim duab 01: Ib qho piv txwv ntawm kev txaus siab
Feem ntau, cov txheej txheem kev txaus siab tuaj yeem kho lub cev yam ntxwv ntawm cov khoom rog. Cov khoom uas nws tuaj yeem kho muaj xws li melting point, plasticity, thiab lwm yam, rau cov ntawv teev npe. Piv txwv li, peb tuaj yeem siv kev txaus siab rau kev tig cov roj rau hauv cov khoom lag luam lossis cov khoom siv semisolid los ntawm kev sib txuas cov roj nrog lwm cov rog rog.
Dab tsi yog Transesterification?
Transesterification yog txheej txheem muaj txiaj ntsig los hloov kho cov qauv ntawm ester. Cov txheej txheem no suav nrog ester thiab cawv ua reactants. Cov txheej txheem transesterification tshwm sim thaum cov pab pawg alkyl ntawm ib qho ester pauv nrog pawg alkyl ntawm cawv. Nyob ntawd, cov cawv ua raws li ib tug nucleophile. Cov txheej txheem yuav tsum muaj ib qho acidic catalyst los yog ib qho yooj yim catalyst. Cov catalyst tuaj yeem txo qhov kev ua kom lub zog thaiv ntawm cov txheej txheem.
Daim duab 02: Transesterification
Ua ntej, cov cawv tau hloov mus rau hauv nucleophile los ntawm kev tshem tawm lub davhlau ya nyob twg hydrogen atom ua proton. Lub transesterification pib nrog kev tawm tsam nucleophilic; cawv tawm tsam cov pa roj carbon atom ntawm ester uas yog sib koom ua ke rau ob lub atoms oxygen. Qhov ntawd yog vim tias cov pa roj carbon atom no muaj ib feem zoo ntawm nws vim tias ob lub pa oxygen atom nyiam cov khoom siv hluav taws xob rau lawv (cov pa atoms yog cov electronegative ntau dua li carbon atoms).
Kev tawm tsam los ntawm cawv nucleophile ua rau muaj kev sib xyaw nruab nrab uas muaj ob qho tib si ester thiab cawv sib koom ua ke los ntawm carbon atom tawm tsam los ntawm nucleophile. Qhov no intermediate compound yog heev unstable. Nyob ntawd, ib qho kev hloov kho tau tshwm sim kom tau txais daim ntawv ruaj khov. Qhov no muab ib daim ntawv ester tshiab. Transesterification muab cov nucleophile ua cov khoom lag luam.
Dab tsi yog qhov zoo sib xws ntawm Interesterification thiab Transesterification?
- Interesterification thiab transesterification koom nrog esters li reactants.
- Ob leeg muab cawv ua ib yam khoom.
Qhov txawv ntawm Interesterification thiab Transesterification yog dab tsi?
Interesterification thiab transesterification yog cov txheej txheem cuam tshuam uas sib txawv ntawm ib leeg raws li lub hom phiaj ntawm cov txheej txheem. Qhov sib txawv tseem ceeb ntawm kev txaus siab thiab kev hloov pauv yog qhov kev txaus siab yog cov tshuaj tiv thaiv ntawm ester thiab cawv kom tau txais ib qho sib txawv ester, hos transesterification yog cov tshuaj tiv thaiv ntawm ester thiab cawv los hloov pawg alkoxy.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm kev txaus siab thiab kev hloov pauv hauv daim ntawv teev npe rau ib sab ntawm kev sib piv.
Summary – Interesterification vs Transesterification
Interesterification yog cov txheej txheem biochemical uas qhov kev hloov pauv tshwm sim hauv cov roj fatty acid ntawm cov khoom muaj roj. Transesterification yog txheej txheem muaj txiaj ntsig los hloov cov qauv ntawm ester. Qhov sib txawv tseem ceeb ntawm kev txaus siab thiab transesterification yog qhov kev txaus siab yog cov tshuaj tiv thaiv ntawm ester thiab cawv kom tau txais ib qho sib txawv ester, hos transesterification yog cov tshuaj tiv thaiv ntawm ester thiab cawv los hloov cov pab pawg alkoxy.
