Txoj kev siv ntau tshaj plaws rau ester ntau lawm yog cov tshuaj tiv thaiv esterification, nyob rau hauv uas carboxylic acid reacts nrog cawv nyob rau hauv lub xub ntiag ntawm acidic catalyst los tsim ib tug ester thiab dej. Industrially, concentrated sulfuric acid los yog acidic ion-pab resins feem ntau ua hauj lwm raws li catalysts; Thaum lub sij hawm cov tshuaj tiv thaiv, cov tawm los yog txhim kho los ntawm kev siv cov cua sov thiab tsis tu ncua tshem tawm cov dej generated. Txoj kev no muaj feem xyuam rau esterification ntawm feem ntau monocarboxylic acids nrog cawv thiab tsim cov txheej txheem tseem ceeb tshaj plaws thiab nthuav dav hauv ob chav kuaj thiab chaw tsim khoom.
Lwm txoj kev tsim khoom tseem ceeb yog transesterification, tseem hu ua alcoholysis ntawm esters. Cov txheej txheem no cuam tshuam nrog cov ester uas twb muaj lawm nrog cawv los tsim cov ester tshiab, thaum ib txhij tso cov cawv qub. Txoj kev no feem ntau siv rau hauv kev tsim cov polyester polymers - xws li hauv kev sib txuas ntawm polyethylene terephthalate (PET). Nws qhov zoo yog nyob rau hauv nws cov tshuaj tiv thaiv me me, nws qhov tsim nyog rau qhov loj - teev kev tsim khoom tas mus li, thiab nws lub peev xwm los kho qhov muaj pes tsawg leeg thiab cov khoom ntawm cov esters tshwm sim.
Kev ua tau zoo thiab cov txiaj ntsig ntawm cov txheej txheem ntau lawm ester yog qhov muaj feem cuam tshuam nrog kev xaiv cov catalysts thiab kev tswj xyuas meej ntawm cov txheej txheem tsis. Hauv cov kua qaub-catalyzed esterification, yam xws li kub, molar piv, thiab txoj kev tshem tawm dej ncaj qha cuam tshuam cov tshuaj tiv thaiv tawm los; conversely, nyob rau hauv transesterification, kev siv cov yooj yim los yog hlau -raws li catalysts yuav ua rau kom cov tshuaj tiv thaiv tus nqi thiab txhim khu kev xaiv. Tsis tas li ntawd, kev ua lag luam niaj hnub no suav nrog ntau yam txheej txheem kev ua kom zoo dua qub-xws li kev siv cov tshuab ua kom tsis tu ncua- tank reactors, nyias-film evaporation, thiab reflux condensation- los txhim kho cov khoom purity thiab ntau lawm efficiency, yog li ua tau raws li cov kev xav tau ntawm ntau hom esters.
