Kupanga Njira ya sodium carboxymethylcellulose

Kapangidwe ka sodium carboxymethylcellulose (CMC) kumaphatikizapo njira zingapo, kuphatikiza kukonza mapadi, etherification, kuyeretsa, ndi kuyanika. Nazi mwachidule za njira zopangira zinthu zonse:

1. Kukonzekera kwa Ma cellulose: Njirayi imayamba ndi kukonza mapadi, omwe nthawi zambiri amapangidwa kuchokera ku zamkati kapena thonje. Ma cellulose amayamba kuyeretsedwa ndikuyengedwa kuti achotse zonyansa monga lignin, hemicellulose, ndi zina. Ma cellulose oyeretsedwawa amagwira ntchito ngati poyambira kupanga CMC.
2. Alkalization: Ma cellulose oyeretsedwa amathandizidwa ndi njira ya alkaline, nthawi zambiri sodium hydroxide (NaOH), kuti awonjezere kuyambiranso kwake ndikupangitsa kuti etherification ichitike. Alkalization imathandizanso kutupa ndikutsegula ulusi wa cellulose, zomwe zimapangitsa kuti zikhale zosavuta kusinthidwa ndi mankhwala.
3. Etherification Reaction: Ma cellulose a alkaliized amachitidwa ndi monochloroacetic acid (MCA) kapena mchere wake wa sodium, sodium monochloroacetate (SMCA), pamaso pa chothandizira pansi pamikhalidwe yoyendetsedwa. Kuchita kwa etherification kumeneku kumaphatikizapo kulowetsa m'malo mwa magulu a hydroxyl pamaketani a cellulose ndi magulu a carboxymethyl (-CH2COONa). Digiri ya substitution (DS), yomwe imayimira kuchuluka kwamagulu a carboxymethyl pagawo la shuga la cellulose chain, imatha kuwongoleredwa posintha momwe zimachitikira monga kutentha, nthawi yochitira, komanso kuchuluka kwa zomwe timachita.
4. Neutralization: Pambuyo pa etherification reaction, zotsatira zake zimasinthidwa kuti zisinthe magulu aliwonse a acidic kukhala mawonekedwe awo amchere a sodium (carboxymethylcellulose sodium). Izi zimatheka powonjezera njira ya alkaline, monga sodium hydroxide (NaOH), kusakaniza. Neutralization imathandizanso kusintha pH ya yankho ndikukhazikika kwa CMC.
5. Kuyeretsedwa: The crude sodium carboxymethylcellulose ndiye amayeretsedwa kuchotsa zinyalala, reagents osakhudzidwa, ndi-zipatso zochokera kusakaniza. Njira zoyeretsera zingaphatikizepo kuchapa, kusefa, centrifugation, ndi kuyanika. CMC yoyeretsedwa imatsukidwa ndi madzi kuchotsa alkali yotsalira ndi mchere, ndikutsatiridwa ndi kusefera kapena centrifugation kupatutsa cholimba cha CMC ku gawo lamadzimadzi.
6. Kuyanika: Sodium carboxymethylcellulose yoyeretsedwa imawumitsidwa kuti ichotse chinyezi chochulukirapo ndikupeza chinyezi chomwe chimafunikira kuti chisungidwe ndikukonzanso. Njira zowumitsa zingaphatikizepo kuyanika kwa mpweya, kuyanika kwa mpweya, kapena kuyanika ng'oma, kutengera zomwe mukufuna komanso kukula kwake.

Chotsatira chake cha sodium carboxymethylcellulose ndi choyera mpaka choyera kapena chopangidwa ndi granular chomwe chimakhala ndi madzi osungunuka komanso ma rheological properties. Amagwiritsidwa ntchito kwambiri ngati thickening agent, stabilizer, binder, ndi rheology modifier m'mafakitale osiyanasiyana, kuphatikizapo chakudya, mankhwala, zodzoladzola, nsalu, ndi mafakitale.