Qhov sib txawv tseem ceeb ntawm acetate thiab triacetate yog acetate yog ib qho acetate ion, whereas triacetate yog kev sib xyaw ntawm peb acetate ions.
Cov ntsiab lus acetate thiab triacetate feem ntau yog siv los piav txog cellulose diacetate thiab cellulose triacetate molecules.
Acetate yog dab tsi?
Acetate lossis cellulose acetate yog ib hom cellulose uas muaj ob pawg acetate khi rau cov piam thaj molecule. Nws tuaj yeem xa mus rau ib qho acetate ester ntawm cellulose, tab sis tshwj xeeb rau cellulose diacetate. Cov tshuaj no muaj kev siv hauv cov yeeb yaj kiab hauv kev yees duab thiab ua ib feem ntawm qee cov txheej txheem.
Daim duab 01: Cov kauj ruam tsim cov Cellulose Acetate
Cellulose Acetate Production
Thaum xav txog kev tsim cov cellulose acetate, nws yog muab los ntawm cellulose los ntawm kev pib deconstruction ntawm ntoo pulp mus rau hauv ib tug ntshiab fluffy dawb cellulose khoom. Txawm li cas los xij, txhawm rau kom tau txais cov khoom lag luam zoo, peb tuaj yeem siv cov khoom tshwj xeeb ntawm cov pulps, xws li dissolving pulps. Cov cellulose reacts nrog acetic acid los yog acetic anhydride nyob rau hauv lub xub ntiag ntawm sulfuric acid. Sulfuric acid tswj thiab ib nrab hydrolyzes kom tau txais ib daim ntawv hloov pauv tsawg dua ntawm cellulose uas hloov nrog acetate.
Triacetate yog dab tsi?
Triacetate lossis cellulose triacetate yog ib hom cellulose acetate uas muaj peb pawg acetate ib cov piam thaj molecule. Peb tuaj yeem sau cov khoom no ua CTA lossis TAC. Nws tsim los ntawm cov tshuaj tiv thaiv ntawm cellulose thiab ib qhov chaw ntawm acetate ester xws li acetic anhydride. Cov khoom siv no feem ntau siv rau kev tsim cov cellulose fibers thiab zaj duab xis puag. Chemically, cov tshuaj no zoo ib yam li cellulose acetate tab sis txawv vim hais tias txog 92% ntawm cov hydroxyl pawg hauv cellulose triacetate yog acetylated.
Daim duab 02: Cov Qauv Tshuaj ntawm Cellulose Triacetate
Triacetate Production
Thaum xav txog kev tsim cov triacetate, nws tau txais los ntawm cellulose los ntawm acetylation ntawm cellulose nrog acetic acid los yog acetic anhydride, qhov twg qee zaum siv ob qho tib si acetic acid thiab acetic anhydride. Cov kauj ruam acetylation no tuaj yeem hloov cov pawg hydroxyl hauv cov piam thaj molecule rau hauv pawg acetyl. Qhov no ua rau cov khoom siv cellulose polymer yooj yim soluble hauv cov kuab tshuaj organic. Peb tuaj yeem pom tias cellulose acetate tuaj yeem yaj hauv qhov sib xyaw ntawm dichloromethane thiab methanol. Txawm li cas los xij, muaj cov kauj ruam ua tiav thiab. Cov txheej txheem tiav no yog lub npe hu ua S-finishing lossis deg saponification, thiab nws tshem tawm ib feem lossis tag nrho cov acetyl pawg los ntawm cov fiber ntau, tawm hauv lawv nrog cov txheej txheem cellulose. Cov kauj ruam ua tiav no tuaj yeem txo qhov nyiam ntawm cov fibers kom tau txais tus nqi zoo li qub.
Qhov txawv ntawm Acetate thiab Triacetate yog dab tsi?
Cov ntsiab lus acetate thiab triacetate feem ntau yog siv rau cellulose diacetate thiab cellulose triacetate molecules. Qhov sib txawv tseem ceeb ntawm acetate thiab triacetate yog tias acetate yog ib qho acetate ion, thaum triacetate yog kev sib xyaw ntawm peb acetate ions. Tsis tas li ntawd, acetate yog tsim los ntawm cov tshuaj tiv thaiv ntawm acetic acid los yog acetic anhydride nyob rau hauv lub xub ntiag ntawm sulfuric acid nyob rau hauv kev tswj tej yam kev mob, thaum triacetate yog cov tshuaj tiv thaiv ntawm acetic acid los yog acetic anhydride los yog ib tug ua ke ntawm ob qho tib si.
Cov lus qhia hauv qab no qhia txog qhov sib txawv ntawm acetate thiab triacetate hauv daim ntawv tabular.
Summary – Acetate vs Triacetate
Cov ntsiab lus acetate thiab triacetate feem ntau yog siv rau cellulose diacetate thiab cellulose triacetate molecules. Qhov sib txawv tseem ceeb ntawm acetate thiab triacetate yog tias acetate yog ib qho acetate ion, hos triacetate yog kev sib xyaw ntawm peb acetate ions.
