Focus on Cellulose ethers

Isọdọtun ti Hydroxyethyl cellulose

Isọdọtun ti Hydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) jẹ polima ti o yo omi ti o jẹ lilo pupọ ni ọpọlọpọ awọn ile-iṣẹ bii awọn oogun, ohun ikunra, ati ounjẹ. HEC jẹ yo lati cellulose, a adayeba polima ri ni eweko, ati ki o ti wa ni títúnṣe pẹlu hydroxyethyl awọn ẹgbẹ lati mu awọn oniwe-omi solubility ati awọn miiran-ini.

Imudara ti HEC jẹ awọn igbesẹ pupọ lati sọ di mimọ ati yipada polima lati pade awọn ibeere kan pato fun lilo ipinnu rẹ. Awọn atẹle jẹ diẹ ninu awọn igbesẹ ti o wọpọ ti o ni ipa ninu isọdọtun ti HEC:

1. Mimu: Igbesẹ akọkọ ni isọdọtun ti HEC ni isọdọtun ti ohun elo aise cellulose. Eyi pẹlu yiyọ awọn aimọ gẹgẹbi lignin, hemicellulose, ati awọn idoti miiran ti o le ni ipa lori didara ati awọn ohun-ini ti ọja ikẹhin. Mimo le ṣee ṣe nipasẹ awọn ọna oriṣiriṣi bii fifọ, bleaching, ati itọju enzymatic.

2. Alkalization: Lẹhin ti iwẹnumọ, a ṣe itọju cellulose pẹlu ojutu ipilẹ kan lati mu ifasilẹ rẹ pọ si ati dẹrọ ifihan awọn ẹgbẹ hydroxyethyl. Alkalization jẹ igbagbogbo pẹlu iṣuu soda hydroxide tabi potasiomu hydroxide ni awọn iwọn otutu ti o ga ati awọn titẹ.

3. Etherification: Igbesẹ ti o tẹle ni ifihan ti awọn ẹgbẹ hydroxyethyl sori ẹhin cellulose. Eyi ni a ṣe nipasẹ etherification, eyiti o kan didaṣe cellulose pẹlu oxide ethylene ni iwaju ayase ipilẹ. Iwọn etherification le jẹ iṣakoso lati ṣaṣeyọri awọn ohun-ini ti o fẹ gẹgẹbi iki, solubility, ati iduroṣinṣin gbona.

4. Neutralization: Lẹhin etherification, ọja naa jẹ didoju lati yọ eyikeyi alkali ti o ku ati ṣatunṣe pH si ibiti o dara fun lilo ti a pinnu. Neutralization le ṣee ṣe pẹlu acid gẹgẹbi acetic acid tabi citric acid.

5. Sisẹ ati gbigbẹ: Igbesẹ ikẹhin ni sisẹ ati gbigbẹ ti ọja HEC ti a ti mọ. Ọja naa maa n ṣe filtered lati yọkuro eyikeyi awọn aimọ ti o ku ati lẹhinna gbẹ si akoonu ọrinrin to dara fun ibi ipamọ ati gbigbe.

Lapapọ, isọdọtun ti HEC jẹ awọn igbesẹ lẹsẹsẹ lati sọ di mimọ ati yipada ohun elo aise cellulose lati ṣe agbejade didara giga, polima tiotuka omi pẹlu awọn ohun-ini kan pato fun lilo ipinnu rẹ.


Akoko ifiweranṣẹ: Oṣu Kẹta-20-2023
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