Kuita musimboti we cellulose ether hydroxypropyl methyl cellulose: kugadzirwa kweHPMC hydroxypropyl methyl cellulose inoshandisa methyl chloride uye propylene oxide se etherification agents.Kemikari inogadzirisa equation ndeye: Rcell-OH (donje rakanatswa) + NaOH (sodium hydroxide), Sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCHCspan (hydroxypropyl methylcellulose) + NaCl (sodium chloride) ) + H2O (mvura)
Process flow:
yakanatswa donje kupwanya-alkalization-kudya-alkalization-etherification-solvent kupora uye kugeza-centrifugal kupatsanurwa-kuomesa-kupwanya-kusanganisa-Chigadzirwa packaging
1: Raw materials uye zvinhu zvinobatsira pakugadzirwa kwehydroxypropyl methylcellulose Mushonga mukuru ikotoni yakanatswa, uye zvinhu zvinobatsira sodium hydroxide (sodium hydroxide), propylene oxide, methyl chloride, acetic acid, toluene, isopropanol, uye nitrogen.Chinangwa chekupwanya donje chakanatswa ndechekuparadza iyo yakasanganiswa chimiro chedonje rakanatswa kuburikidza nemagetsi simba kuderedza crystallinity uye polymerization degree uye kuwedzera nzvimbo yayo.
2: Kuyera uye mbishi zvinhu zvehutongi hwehutongi: Pasi pechigadziro chemimwe michina, mhando yemhando ipi neipi huru uye yekubatsira mbishi uye chiyero cheiyo yakawedzerwa huwandu uye kusungirirwa kwesolvent kunobata zvakananga zviratidzo zvakasiyana zvechigadzirwa.Iyo nzira yekugadzira ine huwandu hwemvura, uye mvura uye organic zvinonyungudutsa hazvina kusanganiswa zvachose, uye kupararira kwemvura kunokanganisa kugoverwa kwealkali muhurongwa.Kana iyo isina kubvongodzwa zvakakwana, ichave isina kunaka kune yunifomu alkalization uye etherification ye cellulose.
3: Kukurudzira uye kutakura kwehuwandu uye kupisa kupisa: Cellulose alkalization uye etherification zvose zvinoitwa pasi pehterogeneous (kukurudzira nekunze simba) mamiriro.Kunyangwe kupararira uye kubatana kwemvura, alkali, donje rakanatswa uye etherifying mumiriri mune inonyungudutsa system zvakaringana yunifomu, ichakanganisa zvakananga alkalization uye etherification mhedzisiro.Kusaenzana kubvongodza panguva ye alkalization process kunokonzeresa alkali makristasi uye kunaya kwemvura pazasi pemidziyo.Iyo yekumusoro layer concentration yakaderera uye alkalization haina kukwana.Nekuda kweizvozvo, kuchine huwandu hukuru hwemahara alkali muhurongwa mushure mekunge etherification yapera.Kufanana, zvichikonzera kusajeka kwakashata, mamwe mafiibha emahara, kusachengeteka kwemvura, yakaderera gel point, uye yakakwira PH kukosha.
4: Maitiro ekugadzira (slurry kugadzira maitiro)
(1:) Wedzera huwandu hwakatarwa hwealkali yakasimba (790Kg) uye mvura (yakazara system mvura 460Kg) mucaustic soda kettle, kurunga uye kupisa kusvika pakupisa kwe80 degrees kwemaminetsi anopfuura makumi mana, uye alkali yakasimba yakazara. dissolved.
(2:) Wedzera 6500Kg ye solvent kune reactor (chiyero che isopropanol kune toluene mu solvent inenge 15/85);dzvanya alkali mu reactor, uye pfapfaidza 200Kg yekunyungudutsa kune alkali tank mushure mekudzvanya alkali.Bvisa pombi;iyo reaction kettle inotonhorera kusvika 23 ° C, uye pulverized yakanatswa donje (800Kg) inowedzerwa.Mushure mekunge donje rakanatswa rawedzerwa, 600Kg yesolvent inopfapfaidzwa kuti itange alkalization reaction.Kuwedzerwa kwekotoni yakapwanyika yakanatswa inofanira kupedzwa mukati menguva yakatarwa (7 maminitsi) (kureba kwenguva yekuwedzera kwakakosha zvikuru).Kamwe donje rakanatswa rasangana nemhinduro yealkali, iyo alkalization reaction inotanga.Kana nguva yekudya yakanyanya kureba, chiyero che alkalization chichava chakasiyana nekuda kwenguva iyo donje rakanatswa rinopinda mukuita system, zvichikonzera kusaenzana alkalization uye kuderedzwa kwechigadzirwa kufanana.Panguva imwecheteyo, ichaita kuti alkali cellulose ibatane nemhepo kwenguva yakareba kuti iite oxidize uye kuderedza, zvichiita kuti The viscosity yechigadzirwa inoderera.Kuti uwane zvigadzirwa zvine akasiyana viscosity mazinga, vacuum uye nitrogen inogona kuiswa panguva ye alkalization process, kana imwe huwandu hwe antioxidant (dichloromethane) inogona kuwedzerwa.Iyo alkalization nguva inodzorwa pa120min, uye tembiricha inochengetwa pa20-23 ℃.
3
Etherification mamiriro: 950Kg yemethyl chloride uye 303Kg yepropylene oxide.Wedzera etherification agent uye inotonhorera uye fambisa kwemaminitsi makumi mana uye wobva wasimudza tembiricha.Etherification yekutanga tembiricha i56°C, tembiricha inogara iri 2.5h, yechipiri etherification tembiricha i87°C, uye tembiricha inogara iri 2.5h.Iyo hydroxypropyl reaction inogona kuenderera kunenge 30 ° C, iyo reaction rate inokwidziridzwa zvakanyanya pa50 ° C, iyo methoxylation reaction inononoka pa60 ° C, uye isina kusimba pasi pe50 ° C.Huwandu, chikamu uye nguva yemethyl chloride uye propylene oxide, pamwe nekudzora tembiricha yekukwira kweiyo etherification process, inokanganisa zvakananga chimiro chechigadzirwa.
Midziyo yakakosha yekugadzira HPMC reactor, dryer, granulator, pulverizer, etc. Parizvino, vagadziri vazhinji vekunze vanoshandisa michina inogadzirwa muGermany.Midziyo inogadzirwa mudzimba, ingave inokwanisa kugadzira kana mhando yekugadzira, haigone kuzadzisa zvinodiwa zvemhando yepamusoro HPMC kugadzirwa.
Iyo All-In-One Reactor inogadzirwa muGermany inogona kupedzisa akawanda maitirwo nhanho nemudziyo mumwe, kuona otomatiki kudzora, yakagadzikana mhando yechigadzirwa, uye yakachengeteka uye yakavimbika maitiro ekugadzira.
Iwo makuru ezvigadzirwa zvekugadzirwa kweHPMC idonje rakanatswa, sodium hydroxide, methyl chloride, uye propylene oxide.
Nguva yekutumira: Nov-11-2021