Ho hlahisa li-ether tse hloekileng tsa cellulose ho kenyelletsa mehato e mengata, ho qala ka ho ntšoa ha selulose ho tloha thepa ea limela ho ea ho mokhoa oa ho fetola lik'hemik'hale.
Cellulose Sourcing: Cellulose, polysaccharide e fumanehang maboteng a lisele tsa limela, e sebetsa e le thepa e tala bakeng sa cellulose ethers. Mehloli e tloaelehileng e kenyelletsa makhasi a lehong, k'hothone, le limela tse ling tse nang le fiber tse kang jute kapa hemp.
Pulping: Pulping ke mokhoa oa ho arola likhoele tsa selulose ho tsoa ho semela. Hangata sena se finyelloa ka mekhoa ea mechine kapa ea lik'hemik'hale. Mechanical pulping e kenyelletsa ho sila kapa ho hloekisa lisebelisoa ho arola likhoele, ha lik'hemik'hale tsa pulping, tse kang kraft process, li sebelisa lik'hemik'hale tse kang sodium hydroxide le sodium sulfide ho qhaqha lignin le hemicellulose, ho siea cellulose ka morao.
Bleaching (Ho ikhethela): Haeba ho lakatsoa bohloeki bo phahameng, makhasi a cellulose a ka 'na a kena tšebetsong ea bleaching ho tlosa lignin leha e le life tse setseng, hemicellulose le litšila tse ling. Chlorine dioxide, hydrogen peroxide, kapa oksijene ke lisebelisoa tse tloaelehileng tse sebelisoang mohatong ona.
Ketso: Cellulose ethers hangata e lokisoa ka ho arabela selulose ka alkali metal hydroxides ho etsa alkali cellulose bohareng. Mohato ona o kenyelletsa ho ruruha likhoele tsa cellulose ka tharollo ea sodium hydroxide kapa potassium hydroxide ka mocheso o phahameng. Mohato ona oa ts'ebetso o etsa hore cellulose e sebetse haholoanyane ho etherification.
Etherification: Etherification ke mohato oa bohlokoa oa ho hlahisa li-cellulose ethers. E kenyelletsa ho hlahisa lihlopha tsa ether (tse kang methyl, ethyl, hydroxyethyl, kapa hydroxypropyl lihlopha) mokokotlong oa cellulose. Boitšoaro bona hangata bo etsoa ka ho phekola selulose ea alkali ka li-etherifying agents tse kang alkyl halides (mohlala, methyl chloride bakeng sa methyl cellulose), alkylene oxides (mohlala, ethylene oxide bakeng sa hydroxyethyl cellulose), kapa alkyl halohydrins (mohlala, propylene oxide bakeng sa hydroxypropyl cellulose). ) tlas'a maemo a laoloang a mocheso, khatello, le pH.
Neutralization le Ho Hlatsoa: Ka mor'a hore etherification, motsoako oa karabelo o fokotsehe ho tlosa alkali e feteletseng. Hangata sena se etsoa ka ho eketsa asiti, joalo ka hydrochloric acid kapa sulfuric acid, ho fokotsa alkali le ho fokotsa cellulose ether. Sehlahisoa se hlahisoang se hlatsuoa ka metsi ho tlosa lik'hemik'hale leha e le life tse setseng le lihlahisoa.
Ho omisa: Sehlahisoa se hlatsoitsoeng sa cellulose ether hangata se omisoa ho tlosa mongobo o feteletseng le ho fumana mofuta oa ho qetela oa phofo kapa granular. Sena se ka etsoa ho sebelisoa mekhoa e kang ho omisa moea, ho omisa ka vacuum kapa ho omisa.
Taolo ea Boleng: Mehato ea taolo ea boleng e bohlokoa ho netefatsa bohloeki, botsitso, le thepa e lakatsehang ea li-cellulose ethers. Sena se kenyelletsa ho lekola sehlahisoa bakeng sa liparamente tse kang degree of substitution, viscosity, kabo ea boholo ba karolo, mongobo, le bohloeki ho sebelisoa mekhoa ea tlhahlobo e kang titration, viscometry le spectroscopy.
Ho paka le ho Boloka: Hang ha li-ether tsa cellulose li omisitsoe le boleng ba boleng, li kenngoa ka har'a lijana tse loketseng ebe li bolokoa tlas'a maemo a laolehileng ho thibela ho kenngoa ha mongobo le ho senyeha. Ho ngolla ka nepo le litokomane tsa lintlha tsa batch le tsona li bohlokoa bakeng sa ho lateloa le ho latela melao.
Ka ho latela mehato ena, hoa khonahala ho hlahisa li-ether tsa cellulose tse nang le thepa e lakatsehang bakeng sa lits'ebetso tse fapaneng tsa indasteri, ho kenyeletsoa meriana, lijo, litlolo, masela le lisebelisoa tsa kaho.
Nako ea poso: Apr-24-2024