Ts'ebetso ea pulping ea cellulose ethers e kenyelletsa mehato e mengata ea ho ntša selulose ho thepa e tala ebe e e fetola hore e be cellulose ethers. Cellulose ethers ke metsoako e mengata e fapaneng e sebelisoang liindastering tse fapaneng, ho kenyeletsoa meriana, lijo, masela le kaho. Ts'ebetso ea pulping e bohlokoa ho fumana selulose ea boleng bo holimo, thepa e tala bakeng sa tlhahiso ea li-cellulose ethers. E latelang ke tlhaloso e qaqileng ea ts'ebetso ea cellulose ether pulping:
1. Khetho ea thepa e tala:
Ts'ebetso ea pulping e qala ka khetho ea lisebelisoa tse tala tse nang le cellulose. Mehloli e tloaelehileng e kenyelletsa lehong, k'hothone le likhoele tse ling tsa semela. Khetho ea lisebelisoa tse tala e itšetlehile ka lintlha tse kang ho fumaneha ha cellulose ether, litšenyehelo le thepa e lakatsehang.
2. Mokhoa oa ho etsa pulp:
Ho na le mekhoa e mengata ea cellulose pulping, haholo-holo e kenyeletsang lik'hemik'hale tsa pulping le mechanical pulping.
3. Ho hula ka lik'hemik'hale:
Kraft pulping: E kenyelletsa ho phekola lithapo tsa patsi ka motsoako oa sodium hydroxide le sodium sulfide. Ts'ebetso ena e qhala lignin, e siea lisele tsa cellulosic.
Sulfite pulping: Ho sebedisa sulphurous acid kapa bisulfite ho pshatla lignin ka har'a thepa ea lijo.
Organic solvent pulping: Ho sebelisa metsoako ea tlhaho e kang ethanol kapa methanol ho qhala lignin le ho arola likhoele tsa cellulose.
4. Ho hula ka mechine:
Stone-ground wood pulping: E kenyelletsa ho sila lehong pakeng tsa majoe ho arola likhoele ka mochini.
Refiner Mechanical Pulping: E sebelisa matla a mochini ho arola likhoele ka ho hloekisa lithapo tsa patsi.
5. Ho soeufatsa:
Ka mor'a ho phunya, selulose e kena ts'ebetsong ea bleaching ho tlosa litšila le mebala. Chlorine, chlorine dioxide, hydrogen peroxide kapa oksijene e ka sebelisoa nakong ea bleaching.
5.. Phetoho ea cellulose:
Ka mor'a ho hloekisoa, selulose e fetoloa ho hlahisa cellulose ethers. Mekhoa e tloaelehileng e kenyelletsa etherification, esterification le liphetoho tse ling tsa lik'hemik'hale ho fetola thepa ea 'mele le ea lik'hemik'hale ea selulose.
6. Ts'ebetso ea Etherification:
Alkalization: Ho phekola cellulose ka alkali (hangata sodium hydroxide) ho hlahisa selulose ea alkali.
Ho eketsa etherifying agents: Alkaline cellulose e sebetsa le etherifying agents (joaloka alkyl halides kapa alkylene oxides) ho kenya lihlopha tsa ether ka har'a sebopeho sa cellulose.
Neutralization: Neutralization motsoako oa karabelo ho felisa karabelo le ho fumana sehlahisoa se lakatsehang sa cellulose ether.
7. Ho hlatsoa le ho omisa:
Sehlahisoa sa cellulose ether se hlatsuoa ho tlosa lihlahisoa le litšila. Ka mor'a ho hloekisa, thepa e omisitsoe ho finyella mongobo o lakatsehang.
8. Ho sila le ho hlahloba:
Li-ether tsa cellulose tse omileng li ka siloa ho fumana boholo ba likaroloana tse itseng. Sieving e sebelisoa ho arola likaroloana tsa boholo bo hlokahalang.
8. Taolo ea boleng:
Mehato ea taolo ea boleng e kenngoa ts'ebetsong ho netefatsa hore li-cellulose ethers li finyella litekanyetso tse boletsoeng. Sena se kenyelletsa tlhahlobo ea viscosity, degree of substitution, mongobo le liparamente tse ling tse amehang.
9. Ho paka le ho tsamaisoa:
Sehlahisoa sa ho qetela sa cellulose ether se phutheloa ebe se abeloa liindasteri tse fapaneng. Ho paka ka nepo ho netefatsa hore boleng ba sehlahisoa bo bolokoa nakong ea polokelo le lipalangoang.
Ts'ebetso ea pulping ea cellulose ether ke letoto le rarahaneng la mehato e kenyelletsang khetho ea thepa e tala, mokhoa oa pulping, bleaching, cellulose phetoho, etherification, ho hlatsoa, ho omisa, ho sila le ho laola boleng. Mohato o mong le o mong ke oa bohlokoa ho khetholla boleng le thepa ea cellulose ether e hlahisoang, e etsang hore e tšoanelehe bakeng sa mefuta e mengata ea likopo. Tsoelo-pele ea theknoloji e ntse e tsoela pele ho ntlafatsa le ho ntlafatsa mekhoa ena ho eketsa katleho le botsitso ba tlhahiso ea cellulose ether.
Nako ea poso: Jan-15-2024