Cellulose ethers thiab txoj kev los tsim tib yam

Kev tsim khoom ntawmcov cellulose ethersmuaj ntau yam kev hloov pauv tshuaj rau cellulose, ua rau muaj cov khoom siv nrog cov yam ntxwv tshwj xeeb. Cov hauv qab no yog kev piav qhia dav dav ntawm cov txheej txheem siv rau kev tsim cov cellulose ethers:

1. Kev Xaiv Cellulose Qhov Chaw:

• Cov cellulose ethers tuaj yeem tau los ntawm ntau qhov chaw xws li cov ntoo pulp, paj rwb linters, lossis lwm yam khoom siv los ntawm cov nroj tsuag. Kev xaiv ntawm cov cellulose qhov chaw tuaj yeem cuam tshuam rau cov yam ntxwv ntawm cov khoom cellulose ether kawg.

2. Kev ua cov pulp:

• Cov cellulose uas tau los ntawm kev ua pulping kom tawg cov fibers kom yooj yim dua. Kev ua pulping tuaj yeem ua tiav los ntawm kev siv tshuab, tshuaj lom neeg, lossis kev sib xyaw ua ke ntawm ob txoj kev.

3. Kev ntxuav kom huv:

• Cov cellulose uas muab zom lawm yuav raug ntxuav kom huv si kom tshem tawm cov khoom tsis huv, lignin, thiab lwm yam khoom uas tsis yog cellulose. Kev ntxuav kom huv si yog qhov tseem ceeb rau kev tau txais cov khoom siv cellulose zoo.

4. Kev Ua Haujlwm ntawm Cellulose:

• Cov cellulose uas tau ntxuav lawm raug qhib los ntawm kev ua kom nws o hauv cov kua alkaline. Cov kauj ruam no yog qhov tseem ceeb rau kev ua kom cov cellulose muaj zog dua thaum lub sijhawm ua etherification tom qab.

5. Kev Ua Haujlwm Etherification:

• Cov cellulose uas tau ua haujlwm lawm yuav raug etherification, qhov twg cov pawg ether tau muab tso rau hauv cov pawg hydroxyl ntawm cov saw hlau cellulose polymer. Cov neeg sawv cev etherifying feem ntau suav nrog ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, thiab lwm yam.
• Feem ntau cov tshuaj tiv thaiv no raug ua nyob rau hauv kev tswj hwm ntawm qhov kub thiab txias, siab, thiab pH kom ua tiav qib kev hloov pauv (DS) thiab kom tsis txhob muaj cov tshuaj tiv thaiv sab nraud.

6. Kev Ua Kom Tsis Muaj Kev Cuam Tshuam thiab Kev Ntxuav:

• Tom qab qhov kev sib xyaw ua ke ntawm cov tshuaj etherification, cov khoom no feem ntau raug tshem tawm kom tshem tawm cov tshuaj reagents lossis cov khoom seem ntau dhau. Cov kauj ruam ntxuav tom qab ntawd raug ua kom tshem tawm cov tshuaj lom neeg thiab cov khoom tsis huv.

7. Kev ziab:

• Cov cellulose uas tau lim thiab etherified raug ziab kom tau txais cov khoom cellulose ether kawg hauv cov hmoov lossis cov ntawv granular.

8. Kev Tswj Xyuas Zoo:

• Muaj ntau txoj kev siv los ntsuas qhov zoo, xws li nuclear magnetic resonance (NMR) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, thiab chromatography. DS raug saib xyuas ze kom paub tseeb tias muaj kev sib xws.

9. Kev Tsim Khoom thiab Daim Ntawv Thov:

• Cov cellulose ether ces raug tsim ua ntau qib sib txawv kom tau raws li qhov xav tau tshwj xeeb ntawm ntau yam kev siv. Cov cellulose ethers sib txawv yog tsim rau ntau yam lag luam, xws li kev tsim kho, tshuaj, khoom noj, tshuaj pleev xim, thiab lwm yam.

Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov txheej txheem thiab cov xwm txheej tshwj xeeb yuav txawv raws li cov khoom cellulose ether xav tau thiab daim ntawv thov uas tau npaj tseg. Cov chaw tsim khoom feem ntau siv cov txheej txheem tshwj xeeb los tsim cov cellulose ethers nrog cov khoom tshwj xeeb uas tsim los ua kom tau raws li qhov xav tau ntawm ntau yam kev lag luam.