Kugwiritsa ntchito cellulose ngati zinthu zopangira,CMC-NaYakonzedwa pogwiritsa ntchito njira ziwiri. Yoyamba ndi njira ya alkalizing ya cellulose. Cellulose imagwira ntchito ndi sodium hydroxide kuti ipange alkali cellulose, kenako alkali cellulose imagwira ntchito ndi chloroacetic acid kuti ipange CMC-Na, yomwe imatchedwa etherification.
Dongosolo la reaction liyenera kukhala la alkaline. Njirayi ndi ya Williamson ether synthesis method. Njira ya reaction ndi nucleophilic substitution. Dongosolo la reaction ndi la alkaline, ndipo limaphatikizidwa ndi zina zomwe zimachitika m'madzi, monga sodium glycolate, glycolic acid ndi zina zomwe zimachitika m'madzi. Chifukwa cha kukhalapo kwa zochitika zina, kugwiritsa ntchito alkali ndi etherification agent kudzawonjezeka, motero kuchepetsa mphamvu ya etherification; Nthawi yomweyo, sodium glycolate, glycolic acid ndi zinthu zina zodetsa mchere zimatha kupangidwa m'mbali mwa reaction, zomwe zimapangitsa kuti kuyera ndi magwiridwe antchito a mankhwalawa achepe. Pofuna kuletsa zochitika zina, ndikofunikira osati kungogwiritsa ntchito alkali moyenera, komanso kuwongolera kuchuluka kwa madzi, kuchuluka kwa alkali ndi njira yosakaniza kuti alkalization ikhale yokwanira. Nthawi yomweyo, zofunikira za chinthucho pa viscosity ndi mlingo wa kusintha ziyenera kuganiziridwa, ndipo liwiro la kusakaniza ndi kutentha ziyenera kuganiziridwa mokwanira. Kuwongolera ndi zinthu zina, kuonjezera liwiro la etherification, ndikuletsa kuchitika kwa zochitika zina.
Malinga ndi njira zosiyanasiyana zoyeretsera madzi, kupanga CMC-Na m'mafakitale kungagawidwe m'magulu awiri: njira yochokera m'madzi ndi njira yochokera ku zosungunulira. Njira yogwiritsira ntchito madzi ngati njira yoyankhira imatchedwa njira yochokera m'madzi, yomwe imagwiritsidwa ntchito popanga zinthu zamchere komanso CMC-Na yotsika. Njira yogwiritsira ntchito zosungunulira zachilengedwe ngati njira yoyankhira imatchedwa njira yosungunulira, yomwe ndi yoyenera kupanga CMC-Na yapakatikati ndi yapamwamba. Machitidwe awiriwa amachitidwa mu kneader, yomwe ndi njira yokankhira ndipo pakadali pano ndiyo njira yayikulu yopangira CMC-Na.
Madzi sing'anga njira:
Njira yoyendera madzi ndi njira yopangira mafakitale yoyambirira, yomwe ndi yochita zinthu ndi alkali cellulose ndi etherification agent pansi pa alkali ndi madzi aulere. Panthawi ya alkaliization ndi etherification, palibe organic medium mu dongosolo. Zofunikira pa zida za njira yolumikizira madzi ndizosavuta, ndi ndalama zochepa komanso mtengo wotsika. Choyipa chake ndi kusowa kwa medium yambiri yamadzimadzi, kutentha komwe kumachitika chifukwa cha reaction kumawonjezera kutentha, kumafulumizitsa liwiro la reactions, kumapangitsa kuti etherification ikhale yochepa, komanso kuti zinthu zisakhale bwino. Njirayi imagwiritsidwa ntchito pokonzekera zinthu za CMC-Na zapakati komanso zotsika mtengo, monga sopo, zoyezera kukula kwa nsalu ndi zina zotero.
njira zosungunulira:
Njira yosungunulira imatchedwanso njira yosungunulira yachilengedwe, ndipo mbali yake yayikulu ndi yakuti njira yosungunulira ndi kusungunuka kwa madzi imachitidwa pansi pa organic solvent ngati reaction medium (diluent). Malinga ndi kuchuluka kwa reactive diluent, imagawidwa m'njira yokanda ndi slurry method. Njira yosungunulira ndi yofanana ndi njira yogwirira ntchito ya madzi, komanso imakhala ndi magawo awiri a alkalization ndi etherification, koma reaction method ya magawo awiriwa ndi yosiyana. Njira yosungunulira imasunga njira yonyowetsa alkali, kukanikiza, kuphwanya, kukalamba ndi zina zotero zomwe zimachitika mu njira yamadzi, ndipo alkalization ndi etherification zonse zimachitika mu kneader. Choyipa chake ndichakuti kuwongolera kutentha ndi kochepa, ndipo kufunikira kwa malo ndi mtengo wake ndi kwakukulu. Zachidziwikire, popanga zida zosiyanasiyana, ndikofunikira kuwongolera kutentha kwa makina, nthawi yodyetsera, ndi zina zotero, kuti zinthu zabwino kwambiri komanso magwiridwe antchito zikonzedwe.
Nthawi yotumizira: Epulo-25-2024