Tsim cov txheej txheem ntawm cov sodium carboxymethylcelleculose

Kev tsim qauv ntawm sodium carboxymethylcelleculose (CMC) muaj ntau kauj ruam, suav nrog kev npaj ntawm cellulose, ethermalation, thiab ziab. Ntawm no yog ib tug txheej txheem cej luam ntawm cov txheej txheem raug tsim khoom:

1. Kev npaj ntawm cellulose: cov txheej txheem pib nrog kev npaj ntawm cellulose, uas ib txwm muaj los ntawm ntoo pulp lossis paj rwb binters. Lub cellulose yog thawj lub purified thiab ua kom zoo rau tshem tawm impurities xws li lignin, hemicellulose, thiab lwm yam paug. Lub cellulose cellulose no yog qhov pib cov khoom rau kev tsim cov CMC.
2. Alkalization: lub cellulose huv si yog tom qab kho nrog ib qho kev daws teeb meem alkaline, kom nce nws cov tshuaj tiv thaiv tom ntej ntawm kev tawm tsam tom ntej. Alkalization kuj pab tau swell thiab qhib cov cellulose fibers, ua rau lawv tau txais kev siv tau rau cov tshuaj lom neeg tshuaj.
3. ETherification tiv thaiv: cov celluleized cellulose tau ua rau cov monochloroacetic acid (MCA) lossis cov sodium mianhlorooacetate (SMCA), nyob rau hauv lub xub ntiag ntawm catalyst nyob rau hauv cov mob catalyst. Qhov kev tawm tsam etherification cuam tshuam rau cov pab pawg hauv hydroxyl ntawm lub cellulose chains nrog carboxymethyl (-ch2cola) pawg. Cov degree ntawm kev hloov pauv (DS), uas sawv cev rau cov cargose ib pawg ntawm lub cellulose cov tshuaj tsis xws li qhov kub, thiab cov tshuaj tiv thaiv kev xav.
4. Neutralization: Tom qab lub Ehereification cov tshuaj tiv thaiv, cov khoom lag luam tshwm sim yog neutralized los hloov cov pab pawg uas seem (carboxymethylcelleculose sodium). Qhov no feem ntau ua tiav los ntawm kev ntxiv ib qho kev daws teeb meem alkaline, xws li sodium hydroxide (Naoh), rau cov tshuaj tiv thaiv sib xyaw. Neutralation tseem pab kho cov ph ntawm kev daws teeb meem thiab ruaj khov rau cov khoom cmc.
5. Purification: cov nyoos sodium carboxymethylcellcelleculose los tshem tawm impurities, siv cov tshuaj tiv thaiv, thiab cov khoom lag luam los ntawm cov tshuaj tiv thaiv kab sib xyaw. Txoj kev lim kom huv tau suav nrog kev ntxuav, pom, centrifugation, thiab ziab. Lub lim ntshav CMC feem ntau ntxuav nrog dej kom tshem tawm cov khoom plig alkali thiab ntsev, ua raws li kev lim dej lossis centrifugation cais cov khoom los ntawm cov theem ua kua.
6. DRYING: Cov lim dej kom huv Kev ziab khaub ncaws kom qhuav muaj xws li ziab huab cua, pleev tshuaj kom qhuav, lossis cov khoom kom ziab, nyob ntawm cov khoom lag luam uas xav tau thiab raug ntsuas.

Lub resulting sodium carboxymethylcellpcellpcellcelulose cov khoom yog cov hmoov dawb los yog cov khoom siv dawb los yog cov khoom siv roj solubility thiab rheological. Nws yog dav siv los ua cov neeg sawv cev tuab, ruaj khov, bindology, thiab cov khoom noj, cov tshuaj pleev ib ce, thiab cov ntawv thov kev lag luam.