A dauki ka'idar cellulose ether hydroxypropyl methyl cellulose: samar da HPMC hydroxypropyl methyl cellulose amfani da methyl chloride da propylene oxide a matsayin etherification jamiái.Ma'aunin halayen sinadaran shine: Rcell-OH (auduga mai ladabi) + NaOH (sodium hydroxide), sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCspan (hydroxypropyl methylcellulose) ) + H2O (ruwa)
Tsarin tsari:
murƙushe auduga mai ladabi—alkaliization—ciyarwa—alkalization—etherification — wartsakewa da wanke-wanke—rabuwar centrifugal— bushewa— murƙushe-haɗuwa—Marufi na samfur
1: Raw kayan da kayan taimako don samar da hydroxypropyl methylcellulose Babban albarkatun kasa shine auduga mai ladabi, kuma kayan taimako sune sodium hydroxide (sodium hydroxide), propylene oxide, methyl chloride, acetic acid, toluene, isopropanol, da nitrogen.Manufar mai ladabi auduga murkushe shi ne ya halakar da tari tsarin na mai ladabi auduga ta inji makamashi don rage crystallinity da polymerization digiri da kuma ƙara da surface area.
2: Ma'auni da ingancin ingancin kayan aiki: Ƙarƙashin ƙaddamar da wasu kayan aiki, ingancin kowane nau'i mai mahimmanci da kayan aiki na kayan aiki da rabo na adadin da aka kara da kuma ƙaddamar da ƙaura kai tsaye yana shafar alamomi daban-daban na samfurin.Tsarin tsarin samar da ruwa ya ƙunshi wani adadin ruwa, kuma ruwa da kaushi na halitta ba su da ɓarna gaba ɗaya, kuma watsawar ruwa yana shafar rarraba alkali a cikin tsarin.Idan ba a motsa shi sosai ba, zai zama rashin amfani ga alkalization iri ɗaya da etherification na cellulose.
3: Ƙarfafawa da canja wurin taro da canja wurin zafi: Cellulose alkalization da etherification ana yin su ne a ƙarƙashin yanayi daban-daban (hargitsi ta hanyar ƙarfin waje).Ko watsawa da juna lamba na ruwa, alkali, mai ladabi auduga da etherifying wakili a cikin sauran ƙarfi tsarin ne isasshe uniform, kai tsaye shafi alkalization da etherification effects.Rashin daidaituwa yayin aiwatar da alkalization zai haifar da lu'ulu'u na alkali da hazo a kasan kayan aiki.Matsakaicin babban Layer yana da ƙasa kuma alkalization bai isa ba.A sakamakon haka, har yanzu akwai babban adadin alkali kyauta a cikin tsarin bayan an kammala etherification.Uniformity, yana haifar da rashin gaskiya mara kyau, ƙarin zaruruwa kyauta, rashin riƙe ruwa mara kyau, ƙarancin gel ɗin gel, da ƙimar PH mai girma.
4: Tsarin samarwa (tsarin samar da slurry)
(1:) Ƙara ƙayyadadden adadin m alkali (790Kg) da ruwa (total tsarin ruwa 460Kg) a cikin caustic soda kettle, motsawa da zafi zuwa yawan zafin jiki na digiri 80 na fiye da minti 40, kuma alkali mai ƙarfi ya cika gaba ɗaya. narkar da
(2:) Ƙara 6500Kg na sauran ƙarfi zuwa ga reactor (rabo na isopropanol zuwa toluene a cikin sauran ƙarfi shine game da 15/85);a daka alkali a cikin reactor, sannan a fesa 200Kg na kaushi a cikin tankin alkali bayan danna alkali.Shafe bututun;Ana sanyaya tukunyar amsawa zuwa 23 ° C, kuma ana ƙara auduga mai ladabi (800Kg).Bayan an ƙara auduga mai ladabi, ana fesa 600Kg na sauran ƙarfi don fara amsawar alkalization.Bugu da ƙari na auduga mai laushi mai laushi dole ne a kammala shi a cikin ƙayyadadden lokaci (minti 7) (tsawon lokacin ƙari yana da mahimmanci).Da zarar auduga mai ladabi ya shiga cikin hulɗa da maganin alkali, alƙawarin alkalization zai fara.Idan lokacin ciyarwa ya yi tsayi da yawa, matakin alkalization zai bambanta saboda lokacin da auduga mai ladabi ya shiga tsarin amsawa, yana haifar da rashin daidaituwa na alkalization da rage daidaiton samfurin.A lokaci guda, zai sa alkali cellulose ya kasance cikin hulɗa tare da iska na dogon lokaci don oxidize da raguwa, wanda ya haifar da danko na samfurin yana raguwa.Domin samun samfurori tare da matakan danko daban-daban, ana iya amfani da injin da kuma nitrogen yayin aiwatar da alkalization, ko kuma a iya ƙara wani adadin antioxidant (dichloromethane).Ana sarrafa lokacin alkalization a 120min, kuma ana kiyaye zafin jiki a 20-23 ℃.
(3:) Bayan alkalization ya ƙare, ƙara ƙayyadadden adadin etherifying wakili (methyl chloride da propylene oxide), tada zafin jiki zuwa yanayin da aka ƙayyade kuma aiwatar da amsawar etherification a cikin ƙayyadadden lokaci.
Yanayin etherification: 950Kg na methyl chloride da 303Kg na propylene oxide.Ƙara wakili na etherification kuma yayi sanyi da motsawa na tsawon minti 40 sannan tada zazzabi.Na farko etherification zafin jiki ne 56 ° C, da akai zazzabi lokaci ne 2.5h, na biyu etherification zafin jiki ne 87 ° C, da kuma akai-akai zazzabi ne 2.5h.Halin hydroxypropyl zai iya ci gaba a kusan 30 ° C, ƙimar amsawa yana ƙaruwa sosai a 50 ° C, yanayin methoxylation yana jinkiri a 60 ° C, kuma ya fi rauni ƙasa 50 ° C.Adadin, rabo da lokaci na methyl chloride da propylene oxide, da kuma yanayin hawan zafin jiki na tsarin etherification, ya shafi tsarin samfurin kai tsaye.
Makullin kayan aiki don samar da HPMC shine reactor, bushewa, granulator, pulverizer, da sauransu. A halin yanzu, yawancin masana'antun kasashen waje suna amfani da kayan aikin da aka samar a Jamus.Kayan aikin da aka samar a cikin gida, ko ƙarfin samarwa ne ko ingancin masana'anta, ba zai iya biyan buƙatun samar da HPMC masu inganci ba.
The All-In-One Reactor samar a Jamus iya kammala mahara tsari matakai tare da daya na'urar, gane atomatik iko, barga samfurin ingancin, da aminci da kuma abin dogara samar ayyuka.
Babban albarkatun kasa don samar da HPMC sune auduga mai ladabi, sodium hydroxide, methyl chloride, da propylene oxide.
Lokacin aikawa: Nuwamba 11-2021