Igbaradi ti cellulose ethers

Awọn igbaradi ticellulose ethersjẹ pẹlu iyipada kemikali polymer cellulose adayeba nipasẹ awọn aati etherification. Ilana yii ṣafihan awọn ẹgbẹ ether sori awọn ẹgbẹ hydroxyl ti ẹwọn polima cellulose, ti o yori si dida awọn ethers cellulose pẹlu awọn ohun-ini alailẹgbẹ. Awọn ethers cellulose ti o wọpọ julọ pẹlu Hydroxypropyl Methylcellulose (HPMC), Carboxymethyl Cellulose (CMC), Hydroxyethyl Cellulose (HEC), Methyl Cellulose (MC), ati Ethyl Cellulose (EC). Eyi ni akopọ gbogbogbo ti ilana igbaradi:

1. Ohun elo Cellulose:

• Ilana naa bẹrẹ pẹlu aleji cellulose, eyiti o jẹ deede lati inu igi ti ko nira tabi owu. Yiyan orisun cellulose le ni agba awọn ohun-ini ti ọja ether cellulose ikẹhin.

2. Pulp:

• Cellulose ti wa ni abẹ si awọn ilana pulping lati fọ awọn okun sinu fọọmu iṣakoso diẹ sii. Eyi le pẹlu awọn ọna ẹrọ pulping tabi kemikali.

3. Ìwẹ̀nùmọ́:

• A ti sọ cellulose di mimọ lati yọ awọn aimọ, lignin, ati awọn paati miiran ti kii ṣe cellulosic kuro. Igbesẹ ìwẹnumọ yii ṣe pataki lati gba ohun elo cellulose ti o ni agbara giga.

4. Idahun Etherification:

• Cellulose ti a sọ di mimọ gba etherification, nibiti awọn ẹgbẹ ether ti ṣe afihan si awọn ẹgbẹ hydroxyl lori pq polima cellulose. Yiyan aṣoju etherifying ati awọn ipo iṣe da lori ọja ether cellulose ti o fẹ.
• Awọn aṣoju etherifying ti o wọpọ pẹlu ethylene oxide, propylene oxide, sodium chloroacetate, methyl kiloraidi, ati awọn omiiran.

5. Iṣakoso ti Awọn paramita Idahun:

• Idahun etherification jẹ iṣakoso ni pẹkipẹki ni awọn ofin ti iwọn otutu, titẹ, ati pH lati ṣaṣeyọri iwọn ti o fẹ ti aropo (DS) ati yago fun awọn aati ẹgbẹ.
• Awọn ipo alkaline nigbagbogbo ni iṣẹ, ati pe pH ti adalu ifaseyin jẹ abojuto ni pẹkipẹki.

6. Idaduro ati Fifọ:

• Lẹhin iṣesi etherification, ọja naa jẹ didoju nigbagbogbo lati yọkuro awọn reagents pupọ tabi nipasẹ awọn ọja. Igbesẹ yii ni atẹle nipasẹ fifọ ni kikun lati yọkuro awọn kemikali to ku ati awọn aimọ.

7. Gbigbe:

• Cellulose ti a sọ di mimọ ati etherified ti gbẹ lati gba ọja ether cellulose ikẹhin ni lulú tabi fọọmu granular.

8. Iṣakoso Didara:

• Orisirisi awọn ilana itupalẹ ni a lo fun iṣakoso didara, pẹlu iparun oofa oofa (NMR) spectroscopy, Fourier-transform infurarẹẹdi (FTIR) spectroscopy, ati kiromatogirafi.
• Iwọn aropo (DS) jẹ abojuto paramita to ṣe pataki lakoko iṣelọpọ lati rii daju pe aitasera.

9. Agbekalẹ ati Iṣakojọpọ:

• Awọn ether cellulose lẹhinna ṣe agbekalẹ si awọn onipò oriṣiriṣi lati pade awọn ibeere pataki ti awọn ohun elo lọpọlọpọ. Awọn ọja ikẹhin ti wa ni akopọ fun pinpin.

Igbaradi ti awọn ethers cellulose jẹ ilana kemikali eka ti o nilo iṣakoso iṣọra ti awọn ipo ifura lati ṣaṣeyọri awọn ohun-ini ti o fẹ. Iyipada ti awọn ethers cellulose ngbanilaaye fun lilo wọn ni ọpọlọpọ awọn ohun elo kọja awọn ile-iṣẹ, pẹlu awọn oogun, ounjẹ, ikole, awọn aṣọ, ati diẹ sii.