Kushandisa cellulose seyakagadzirwa zvinhu,CMC-Nayakagadzirwa nenzira mbiri-nhanho. Yekutanga ndiyo alkalization process ye cellulose. Iyo cellulose inopindirana ne sodium hydroxide kugadzira alkali cellulose, uyezve alkali cellulose inopindirana ne chloroacetic acid kugadzira CMC-Na, inodaidzwa kuti etherification.
Iyo reaction system inofanirwa kunge ine alkaline. Iyi nzira ndeyeWilliamson ether synthesis nzira. The reaction mechanism is nucleophilic substitution. Iyo reaction system ndeye alkaline, uye inoperekedzwa nekumwe mativi maitiro pamberi pemvura, senge sodium glycolate, glycolic acid uye zvimwe ne-zvigadzirwa. Nekuda kwekuvapo kwemaside reactions, kushandiswa kwealkali uye etherification agent kuchawedzerwa, nekudaro kudzikisa etherification kunyatsoshanda; Panguva imwe cheteyo, sodium glycolate, glycolic acid uye yakawanda tsvina yemunyu inogona kugadzirwa mudivi rekuita, zvichikonzera kuchena uye kuderedzwa kwekuita kwechigadzirwa. Kuti udzivise maitiro eparutivi, zvinodikanwa kwete kungoshandisa alkali zvine musoro, asiwo kudzora huwandu hwemvura system, kusungirirwa kwealkali uye nzira yekukurudzira nechinangwa chealkalization yakakwana. Panguva imwecheteyo, izvo zvinodikanwa zvechigadzirwa pane viscosity uye dhigirii rekutsiva zvinofanirwa kutariswa, uye kumhanyisa kumhanya uye tembiricha zvinofanirwa kutariswa zvizere. Kudzora uye zvimwe zvinhu, wedzera mwero we etherification, uye inhibisa kuitika kwekuita kwedivi.
Zvinoenderana neakasiyana etherification midhiya, kugadzirwa kwemaindasitiri kweCMC-Na kunogona kukamurwa kuita mapoka maviri: nzira yemvura-yakavakirwa uye nzira yekunyungudutsa. Iyo nzira yekushandisa mvura seyekuita svikiro inonzi nzira yemvura yepakati, iyo inoshandiswa kugadzira alkaline yepakati uye yakaderera-giredhi CMC-Na. Iyo nzira yekushandisa organic solvent seyekuita svikiro inonzi iyo solvent nzira, iyo yakakodzera kugadzirwa kwepakati uye yepamusoro-giredhi CMC-Na. Aya maitiro maviri anoitwa mukneader, inova nzira yekukanya uye parizvino ndiyo nzira huru yekugadzira CMC-Na.
Mvura yepakati nzira:
Iyo nzira inotakurwa nemvura ndeyekutanga maindasitiri ekugadzira maitiro, ari kuita alkali cellulose uye etherification agent pasi pemamiriro emahara alkali nemvura. Munguva ye alkalization uye etherification, hapana organic medium muhurongwa. Zvinodiwa zvemidziyo yemvura media nzira zviri nyore, ine mari shoma uye mutengo wakaderera. Izvo zvakashata ndeyekushaikwa kwehuwandu hwakakura hwepakati pemvura, kupisa kunokonzerwa nekuita kunowedzera tembiricha, inomhanyisa kukurumidza kwekuita kwepadivi, inotungamira kune yakaderera etherification kushanda, uye hurombo hwechigadzirwa. Iyo nzira inoshandiswa kugadzirira yepakati uye yakaderera-giredhi CMC-Na zvigadzirwa, senge detergents, textile sizeng agents nezvimwe zvakadaro.
Solvent nzira:
Iyo nzira yekunyungudutsa inonziwo organic solvent nzira, uye chimiro chayo chikuru ndechekuti alkalization uye etherification reactions inoitwa pasi pemamiriro eiyo organic solvent seyekuita svikiro (diluent). Zvinoenderana nehuwandu hweiyo reactive diluent, yakakamurwa kuita yekukanya nzira uye slurry nzira. Iyo yekunyungudutsa nzira yakafanana neyekuita maitiro emvura nzira, uye zvakare ine nhanho mbiri dze alkalization uye etherification, asi maitiro ekuita zvematanho maviri aya akasiyana. Iyo yekunyungudutsa nzira inochengetedza maitiro ekunyorovesa alkali, kudzvanya, kupwanya, kuchembera uye zvichingodaro zvinogara munzira yemvura, uye alkalization uye etherification zvese zvinoitwa mukneader. Izvo zvakashata ndezvekuti tembiricha controllability ishoma, uye nzvimbo inodiwa uye mutengo wakakwira. Ehe, pakugadzirwa kweakasiyana emidziyo marongero, zvinodikanwa kunyatso kudzora tembiricha yehurongwa, nguva yekudyisa, nezvimwe, kuitira kuti zvigadzirwa zvine mhando yakanakisa uye kuita zvigadziriswe.
Nguva yekutumira: Kubvumbi-25-2024