Kev tsim khoom lag luam ntawm propylene glycol feem ntau siv propylene oxide ua cov khoom siv raw, uas yog hloov los ntawm cov tshuaj tiv thaiv hydration. propylene oxide reacts nrog dej nyob rau hauv tej yam kub thiab siab tej yam kev mob; Qhov qhib ntawm lub nplhaib epoxide tshwm sim hauv kev tsim cov propylene glycol. Cov txheej txheem no yog cov txheej txheem kev lag luam uas muaj cov cuab yeej paub tab, cov khoom siv dav dav, thiab kev ua haujlwm ruaj khov. Thaum lub sij hawm cov tshuaj tiv thaiv, qhov piv ntawm propylene oxide rau dej thiab cov tshuaj tiv thaiv kub cuam tshuam cov tshuaj tiv thaiv tus nqi thiab cov muaj pes tsawg leeg ntawm cov khoom kawg; yog li ntawd, cov txheej txheem yuav tsum tau ua tib zoo tswj kom tau raws li qhov yuav tsum tau ua.
Nyob rau hauv cov txheej txheem ntau lawm, propylene oxide thiab dej yog pub rau hauv cov tshuaj tiv thaiv kab mob kom undergo hydration nyob rau hauv tsim nyog tej yam kev mob. Txij li thaum cov tshuaj tiv thaiv ntawm propylene oxide thiab dej tuaj yeem tawm tsis tau tsuas yog 1,2-propylene glycol tab sis kuj los ntawm cov khoom xws li dipropylene glycol thiab tripropylene glycol, qhov sib piv ntawm reactant thiab cov tshuaj tiv thaiv yuav tsum tau tswj kom meej. Thaum ua tiav cov tshuaj tiv thaiv, qhov sib xyaw ua ke muaj propylene glycol, dej, thiab me me ntawm lwm yam cawv; Cov kauj ruam tom ntej ntawm kev sib cais thiab kev ua kom huv yog feem ntau yuav tsum tau txais cov khoom siv propylene glycol uas ua tau raws li kev siv tshwj xeeb.
Kev ua kom huv ntawm propylene glycol feem ntau yog ua tiav los ntawm cov txheej txheem xws li distillation, lub cev qhuav dej, thiab fractionation. Tom qab kev kho ua ntej ntawm cov tshuaj tiv thaiv sib xyaw kom tshem tawm cov dej ntau, cov khoom sib cais raws li qhov sib txawv ntawm lawv cov ntsiab lus kub, cais propylene glycol los ntawm -cov khoom xws li dipropylene glycol thiab tripropylene glycol. Cov khoom uas xav tau ntau dua purity undergo ntxiv fractional distillation kom txo impurity theem. Optimizing tsis xws li distillation kub, siab, thiab reflux tej yam kev mob tso cai rau nce propylene glycol purity thiab cov khoom tawm los.