Li-ether tsa cellulose le mokhoa oa ho hlahisa tse tšoanang

Tlhahiso eali-ether tsa selulosee kenyelletsa letoto la diphetoho tsa dikhemikhale ho cellulose, e leng se fellang ka di-derivatives tse nang le thepa e ikgethang. Se latelang ke kakaretso ya mekgwa e sebediswang ho hlahisa di-ether tsa cellulose:

1. Khetho ea Mohloli oa Cellulose:

• Li-ether tsa cellulose li ka fumanoa mehloling e fapaneng e kang pulp ea lehong, linter tsa k'hothone, kapa thepa e 'ngoe e thehiloeng limela. Khetho ea mohloli oa cellulose e ka ama litšobotsi tsa sehlahisoa sa ho qetela sa ether ea cellulose.

2. Ho hema:

• Mohloli oa cellulose o feta ho phuthoa ho qhaqha likhoele hore li be sebopeho se laolehang habonolo. Ho phuthoa ho ka finyelloa ka mechine, lik'hemik'hale, kapa motsoako oa mekhoa ena ka bobeli.

3. Tlhoekiso:

• Selulose e pulped e etsoa lits'ebetso tsa ho hloekisa ho tlosa litšila, lignin, le likarolo tse ling tse seng tsa cellulosic. Ho hloekisa hoa hlokahala bakeng sa ho fumana thepa ea cellulose ea boleng bo holimo.

4. Ho kenya tshebetsong ha Cellulose:

• Selulose e hloekisitsoeng e kenngwa tshebetsong ka ho e ruruhisa ka hara tharollo ya alkaline. Mohato ona o bohlokwa bakeng sa ho etsa hore selulose e arabele haholoanyane nakong ya karabelo e latelang ya etherification.

5. Karabelo ea Etherification:

• Cellulose e sebetsang e feta ho etherification, moo lihlopha tsa ether li kenngoang lihlopheng tsa hydroxyl tse ketane ea polymer ea cellulose. Li-etherifying tse tloaelehileng li kenyelletsa ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, le tse ling.
• Karabelo hangata e etsoa tlas'a maemo a laoloang a mocheso, khatello le pH ho fihlela tekanyo e lakatsehang ea phetolo (DS) le ho qoba likarabelo tse ka thoko.

6. Ho se nke lehlakore le ho hlatswa:

• Kamora karabelo ea etherification, sehlahisoa hangata sea koaheloa ho tlosa li-reagent tse ngata kapa lihlahisoa tse ling. Mehato e latelang ea ho hlatsoa e etsoa ho tlosa lik'hemik'hale le litšila tse setseng.

7. Ho omisa:

• Selulose e hloekisitsoeng le e nang le ether e omisoa ho fumana sehlahisoa sa ho qetela sa ether ea cellulose ka mokhoa oa phofo kapa oa granular.

8. Taolo ea Boleng:

• Mekhoa e fapaneng ea tlhahlobo, ho kenyeletsoa le spectroscopy ea nuclear magnetic resonance (NMR), spectroscopy ea infrared ea Fourier-transform (FTIR), le chromatography, e sebelisoa bakeng sa taolo ea boleng. DS e beoa leihlo haufi-ufi ho netefatsa botsitso.

9. Tlhahiso le Ts'ebeliso:

• Ebe ether ea cellulose e hlophisoa ka mekhahlelo e fapaneng ho fihlela litlhoko tse ikhethileng tsa lits'ebetso tse fapaneng. Li-ether tse fapaneng tsa cellulose li loketse liindasteri tse fapaneng, tse kang tsa kaho, meriana, lijo, liphahlo le tse ling.

Ho bohlokoa ho hlokomela hore mekhoa le maemo a itseng a ka fapana ho latela sehlahisoa se lakatsehang sa ether ea cellulose le ts'ebeliso e reriloeng. Bahlahisi hangata ba sebelisa lits'ebetso tse ikhethileng ho hlahisa li-ether tsa cellulose tse nang le thepa e itseng e etselitsoeng ho fihlela litlhoko tsa liindasteri tse fapaneng.