Molao-motheo oa karabelo ea cellulose ether hydroxypropyl methyl cellulose: tlhahiso ea HPMC hydroxypropyl methyl cellulose e sebelisa methyl chloride le propylene oxide e le li-etherification agents. The chemical reaction equation equation ke: Rcell-OH (cotton e hloekisitsoeng) + NaOH (sodium hydroxide) , Sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCHCspan (hydroxypropyl methylcellulose) + NaCl chloride (sodium chloride) ) + H2O (metsi)
Phallo ea ts'ebetso:
e hloekisitsoeng k'hothone e silakanya-alkalization-ho fepa-alkalization-etherification-solvent recovery le ho hlatsoa-centrifugal karohano-ho omisa-ho senya-ho kopanya - Ho paka ka lihlahisoa
1: Lisebelisoa tse tala le lisebelisoa tse thusang bakeng sa tlhahiso ea hydroxypropyl methylcellulose Ntho e ka sehloohong e tala ke k'hothone e hloekisitsoeng, 'me lisebelisoa tse thusang ke sodium hydroxide (sodium hydroxide), propylene oxide, methyl chloride, acetic acid, toluene, isopropanol le nitrogen. Sepheo sa ho silakanya k'hothone e hloekisitsoeng ke ho senya mohaho o kopantsoeng oa k'hothone e hloekisitsoeng ka matla a mochine ho fokotsa crystallinity le polymerization degree le ho eketsa sebaka sa eona.
2: Tekanyo le taolo ea boleng ba thepa e tala: Tlas'a motheo oa lisebelisoa tse itseng, boleng ba thepa efe kapa efe e ka sehloohong le e thusang le karo-karolelano ea palo e ekelitsoeng le bongata ba solvent li ama ka kotloloho matšoao a fapaneng a sehlahisoa. Sistimi ea ts'ebetso ea tlhahiso e na le palo e itseng ea metsi, 'me metsi le li-solvents ha li kopane ka ho feletseng,' me ho hasana ha metsi ho ama kabo ea alkali tsamaisong. Haeba e sa tsosoe ka ho lekaneng, e tla ba disadvantageous ho alkalization e tšoanang le etherification ea cellulose.
3: Ho susumetsa le ho fetisa boima le ho fetisetsa mocheso: Cellulose alkalization le etherification kaofela li etsoa tlas'a maemo a sa tšoaneng (ho hlohlelletsoa ke matla a ka ntle). Ho sa tsotellehe hore na ho qhalakanngoa le ho kopana ha metsi, alkali, k'hothone e hloekisitsoeng le moemeli oa etherifying tsamaisong ea solvent li lekana ka ho lekaneng, li tla ama ka ho toba liphello tsa alkalization le etherification. Ho se leka-lekane ho susumetsang nakong ea ts'ebetso ea alkalization ho tla baka likristale tsa alkali le pula e ka tlaase ho thepa. Karolo e ka holimo ea lera e tlaase 'me alkalization ha e lekane. Ka lebaka leo, ho ntse ho e-na le palo e kholo ea alkali ea mahala tsamaisong ka mor'a hore etherification e phethoe. Ho tšoana, ho bakang ponaletso e mpe, likhoele tse ngata tsa mahala, paballo e mpe ea metsi, ntlha e tlase ea gel, le boleng bo phahameng ba PH.
4: Ts'ebetso ea tlhahiso (ts'ebetso ea tlhahiso ea slurry)
(1:) Eketsa palo e boletsoeng ea alkali e tiileng (790Kg) le metsi (kakaretso ea metsi a 460Kg) ka kettle ea caustic soda, e tsosang le mocheso ho mocheso o sa khaotseng oa likhato tse 80 ka metsotso e fetang 40, 'me alkali e tiileng e felile ka ho feletseng. qhadile.
(2:) Eketsa 6500Kg ea solvent ho reactor (karolelano ea isopropanol ho toluene ka solvent e ka bang 15/85); tobetsa alkali ka har'a reactor, 'me u fafatse 200Kg ea solvent ho tanka ea alkali ka mor'a ho hatella alkali. Hlakola pipeline; ketlele ea karabelo e pholile ho 23 ° C, 'me k'hothone e hloekisitsoeng ea pulverized (800Kg) ea eketsoa. Kamora hore k'hothone e hloekisitsoeng e eketsoe, 600Kg ea solvent e fafatsoa ho qala karabelo ea alkalization. Ho eketsoa ha k'hothone e hloekisitsoeng e silafetseng e tlameha ho phethoa ka nako e behiloeng (metsotso e 7) (bolelele ba nako ea ho eketsa bo bohlokoa haholo). Hang ha k'hothone e hloekisitsoeng e kopana le tharollo ea alkali, karabelo ea alkalization e qala. Haeba nako ea ho fepa e le telele haholo, tekanyo ea alkalization e tla fapana ka lebaka la nako eo k'hothone e hloekisitsoeng e kenang tsamaisong ea karabelo, e bakang alkalization e sa lekaneng le ho fokotsa ho tšoana ha sehlahisoa. Ka nako e ts'oanang, e tla etsa hore selulose ea alkali e kopane le moea ka nako e telele ho oxidize le ho senya, ho fella ka hore Viscosity ea sehlahisoa e fokotsehe. Bakeng sa ho fumana lihlahisoa tse nang le maemo a fapaneng a viscosity, vacuum le nitrogen li ka sebelisoa nakong ea alkalization, kapa palo e itseng ea antioxidant (dichloromethane) e ka eketsoa. Nako ea alkalization e laoloa ho 120min, 'me mocheso o bolokiloe ho 20-23 ℃.
3
Maemo a Etherification: 950Kg ea methyl chloride le 303Kg ea propylene oxide. Eketsa etherification agent mme u pholile 'me u hlohlelletse metsotso e 40 ebe u phahamisa mocheso. Mocheso oa pele oa etherification ke 56 ° C, nako ea mocheso e sa khaotseng ke 2.5h, mocheso oa bobeli oa etherification ke 87 ° C, 'me mocheso o sa khaotseng ke 2.5h. Karabelo ea hydroxypropyl e ka tsoela pele hoo e ka bang 30 ° C, sekhahla sa karabelo se potlakisoa haholo ho 50 ° C, karabelo ea methoxylation e lieha ho 60 ° C, 'me e fokola ka tlase ho 50 ° C. Palo, karolo le nako ea methyl chloride le propylene oxide, hammoho le taolo ea ho phahama ha mocheso oa mokhoa oa etherification, e ama ka ho toba sebopeho sa sehlahisoa.
Thepa ea bohlokoa bakeng sa ho hlahisa HPMC ke reactor, dryer, granulator, pulverizer, joalo-joalo. Hona joale, bahlahisi ba bangata ba tsoang linaheng tse ling ba sebelisa thepa e hlahisoang Jeremane. Thepa e hlahisoang lapeng, ebang ke bokhoni ba tlhahiso kapa boleng ba tlhahiso, ha e khone ho fihlela litlhoko tsa tlhahiso ea boleng bo holimo ea HPMC.
All-In-One Reactor e hlahisoang Jeremane e ka qeta mehato e mengata ea ts'ebetso ka sesebelisoa se le seng, ea hlokomela taolo ea othomathike, boleng bo tsitsitseng ba sehlahisoa, le ts'ebetso e sireletsehileng le e tšepahalang ea tlhahiso.
Lisebelisoa tsa mantlha tsa tlhahiso ea HPMC ke k'hothone e hloekisitsoeng, sodium hydroxide, methyl chloride, le propylene oxide.
Nako ea poso: Nov-11-2021