Kugwiritsa ntchito cellulose ngati zopangira,CMC-Nalinakonzedwa ndi njira ziwiri. Choyamba ndi njira ya alkalization ya cellulose. Ma cellulose amakumana ndi sodium hydroxide kupanga alkali cellulose, kenako alkali cellulose imakumana ndi chloroacetic acid kupanga CMC-Na, yomwe imatchedwa etherification.
Dongosolo lazomwe liyenera kukhala lamchere. Njirayi ndi ya Williamson ether synthesis method. The reaction mechanism ndi nucleophilic substitution. Dongosolo la zomwe ndi zamchere, ndipo limatsagana ndi zina zomwe zimachitika pamaso pamadzi, monga sodium glycolate, glycolic acid ndi zinthu zina. Chifukwa cha kukhalapo kwa mbali zimachitikira, kumwa kwa alkali ndi etherification wothandizira kudzawonjezeka, potero kuchepetsa mphamvu ya etherification; Panthawi imodzimodziyo, sodium glycolate, glycolic acid ndi zonyansa zambiri zamchere zimatha kupangidwa m'mbali mwake, zomwe zimapangitsa chiyero ndi kuchepa kwa ntchito. Pofuna kupondereza zotsatira za mbali, sikoyenera kugwiritsa ntchito alkali moyenerera, komanso kulamulira kuchuluka kwa madzi, kuchuluka kwa alkali ndi njira yotsitsimula ndi cholinga cha alkalization yokwanira. Panthawi imodzimodziyo, zofunikira za mankhwala pa viscosity ndi digiri ya kulowetsedwa m'malo ziyenera kuganiziridwa, ndipo kuthamanga kwachangu ndi kutentha ziyenera kuganiziridwa mozama. Control ndi zinthu zina, kuonjezera mlingo wa etherification, ndi ziletsa kuchitika kwa mbali zimachitikira.
Malinga ndi ma etherification media osiyanasiyana, kupanga mafakitale a CMC-Na kumatha kugawidwa m'magulu awiri: njira yopangira madzi ndi njira yosungunulira. Njira yogwiritsira ntchito madzi monga njira yochitiramo imatchedwa njira yamadzi sing'anga, yomwe imagwiritsidwa ntchito popanga zamchere zamchere ndi zotsika za CMC-Na. Njira yogwiritsira ntchito zosungunulira organic monga sing'anga anachita amatchedwa njira zosungunulira, amene ali oyenera kupanga sing'anga ndi mkulu-kalasi CMC-Na. Zochita ziwirizi zimachitika mu kneader, yomwe ndi njira yokanda ndipo ndiyo njira yayikulu yopangira CMC-Na.
Njira yapakati pamadzi:
Njira yoyendetsedwa ndi madzi ndi njira yopangira mafakitale kale, yomwe ndikuchitapo kanthu pa cellulose ya alkali ndi etherification wothandizira pansi pa alkali yaulere ndi madzi. Pa alkalization ndi etherification, palibe organic sing'anga mu dongosolo. Zofunikira za zida za njira ya media media ndizosavuta, zokhala ndi ndalama zochepa komanso zotsika mtengo. The sangathe ndi kusowa kwa kuchuluka kwa madzi sing'anga, kutentha kwaiye ndi zimene kumawonjezera kutentha, Iyamba Kuthamanga liwiro la mbali zimachitikira, kumabweretsa otsika etherification dzuwa, ndi osauka mankhwala khalidwe. Njirayi imagwiritsidwa ntchito pokonzekera zinthu zapakatikati komanso zotsika za CMC-Na, monga zotsukira, zopangira nsalu ndi zina zotero.
Njira yosungunulira:
The zosungunulira njira amatchedwanso organic zosungunulira njira, ndi mbali yake yaikulu ndi kuti alkalization ndi etherification zimachitikira pansi pa chikhalidwe cha zosungunulira organic monga anachita sing'anga (diluent). Malinga ndi kuchuluka kwa diluent yogwira ntchito, imagawidwa m'njira yokanda ndi slurry. The zosungunulira njira n'chimodzimodzi ndi anachita ndondomeko ya madzi njira, komanso tichipeza magawo awiri alkalization ndi etherification, koma anachita sing'anga magawo awiriwa ndi osiyana. The zosungunulira njira amapulumutsa ndondomeko zilowerere zamchere, kukanikiza, kuphwanya, kukalamba ndi zina zotero chibadidwe mu njira madzi, ndi alkalization ndi etherification zonse ikuchitika mu kneader. Choyipa chake ndi chakuti kutentha kwa kutentha kumakhala kosauka, ndipo kufunikira kwa malo ndi mtengo wake ndi wapamwamba. Kumene, kupanga masanjidwe osiyana zida, m`pofunika mosamalitsa kulamulira kutentha dongosolo, kudyetsa nthawi, etc., kuti mankhwala ndi khalidwe kwambiri ndi ntchito akhoza kukonzekera.
Nthawi yotumiza: Apr-25-2024