Mabda'a falcelinta ee cellulose ether hydroxypropyl methyl cellulose: wax soo saarka ee HPMC hydroxypropyl methyl cellulose isticmaalaa methyl chloride iyo propylene oxide sida wakiilada etherification.Isla'egta falcelinta kiimikada waa: Rcell-OH (suuf la safeeyey) + NaOH (sodium hydroxide), Sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCspan (hydroxypropyl methylcellulose) ) + H2O (biyo)
Habka socodka:
Burburinta suufka la safeeyey—alkaliization-quudinta—alkalidayn—etherification — soo kabashada iyo dhaqidda millatariga — kala-soocidda centrifugal—qallajinta—burburin—isku darka — Baakadaha alaabta
1: Qalab cayriin ah iyo qalab caawiye ah oo loogu talagalay soo saarista hydroxypropyl methylcellulose Maaddada ugu weyn ee ceeriin waa suuf la safeeyey, iyo walxaha kaabaya waa sodium hydroxide (sodium hydroxide), propylene oxide, methyl chloride, acetic acid, toluene, isopropanol, iyo nitrogen.Ujeedada suufka la safeeyey waa in la burburiyo qaabdhismeedka isku dhafan ee suufka la safeeyey iyada oo loo marayo tamarta farsamada si loo yareeyo crystallinity iyo shahaadada polymerization iyo kordhinta aagga dusha sare.
2: Cabbirka iyo xakamaynta tayada alaabta ceeriin: Marka la eego dhismaha qalabka qaarkood, tayada alaabta ceeriin ee muhiimka ah iyo kaaliyaha ah iyo saamiga qadarka lagu daray iyo xoojinta dareeraha ayaa si toos ah u saameeya tilmaamayaasha kala duwan ee alaabta.Nidaamka habka wax soo saarka wuxuu ka kooban yahay qadar gaar ah oo biyo ah, biyaha iyo dareerayaasha organic ma aha kuwo gebi ahaanba qallafsan, iyo kala-baxa biyaha ayaa saameeya qaybinta alkali ee nidaamka.Haddii aan si ku filan loo walaaqin, waxay dhib u yeelan doontaa alkalization lebbiska iyo eterification ee cellulose.
3: Kicinta iyo wareejinta tirada badan iyo wareejinta kulaylka: Alkalization Cellulose iyo etherification ayaa dhamaantood lagu fuliyaa xaalado kala duwan (kicinta xoog dibadeed).Haddii kala firdhinta iyo xidhiidhka labada dhinac ee biyaha, alkali, suufka la safeeyey iyo wakiilka etherifying ee nidaamka dareeraha ay yihiin kuwo ku filan lebis, waxay si toos ah u saameyn doontaa saamaynta alkalization iyo etherification.Walaaqda aan sinnayn inta lagu jiro habka alkalization waxay keeni doontaa kiristaalo alkali iyo roobka hoose ee qalabka.Diiradda lakabka sare waa mid hooseeya oo alkalization kuma filna.Natiijo ahaan, weli waxaa jira qadar badan oo alkali ah oo bilaash ah nidaamka ka dib marka la dhammeeyo etherification.Labbiska, taasoo keentay hufnaan liidata, fiilooyinka bilaashka ah oo dheeraad ah, haynta biyaha liidata, barta jel hooseeya, iyo qiimaha PH sare.
4: Habka wax-soo-saarka (habka wax-soo-saarka slurry)
(1:) Ku dar qadarka la cayimay ee alkali adag (790Kg) iyo biyo (wadarta nidaamka biyaha 460Kg) geli kiish soodhaha caustic, walaaq iyo kulayl si heerkul joogto ah 80 digrii in ka badan 40 daqiiqo, iyo alkali adag waa gebi ahaanba. milmay.
(2:) Ku dar 6500Kg oo dareere ah reactor (saamiga isopropanol ilaa toluene ee dareeraha waa qiyaastii 15/85);alkali ku cadaadi reactor-ka, oo ku buufi 200Kg oo dareere ah taangiga alkali ka dib markaad riixdo alkali.Ku dhaq dhuunta;Kiliga falcelinta waxa la qaboojiyey ilaa 23°C, waxaana lagu daraa suuf la safeeyey oo la miiray (800Kg).Ka dib marka suufka la safeeyey lagu daro, 600Kg oo dareere ah ayaa lagu buufiyaa si loo bilaabo falcelinta alkalization.Ku darida suufka la safeeyey ee la safeeyey waa in lagu dhammeeyaa wakhtiga la cayimay (7 daqiiqo) (dhererka wakhtiga dheeriga ah waa mid aad muhiim u ah).Marka suufka la safeeyey uu la kulmo xalalka alkali, falcelinta alkalization waxay bilaabmaysaa.Haddii wakhtiga quudintu aad u dheer yahay, heerka alkalization wuu ka duwanaan doonaa sababtoo ah wakhtiga marka suufka la safeeyey uu galo habka falcelinta, taasoo keenta alkalization aan sinnayn iyo hoos u dhigista alaabta.Isla mar ahaantaana, waxay keeni doontaa cellulose alkali in ay la xiriirto hawada muddo dheer si ay u oksijiinta iyo hoos u dhigto, taasoo keentay in mawjadaha alaabta hoos u dhaco.Si loo helo badeecooyin leh heerar viscosity oo kala duwan, faakuum iyo nitrogen ayaa lagu dabaqi karaa inta lagu jiro habka alkalization, ama qadar go'an oo ah antioxidant (dichloromethane) ayaa lagu dari karaa.Waqtiga alwaaxinta waxaa lagu xakameynayaa 120min, heerkulkana waxaa lagu hayaa 20-23 ℃.
(3:) Ka dib markii alkalization waa in ay dhammaato, ku dar qadarka la cayimay ee wakiilka etherifying (methyl chloride iyo propylene oxide), kor u heerkulka heerkulka la cayimay iyo fulinta falcelinta etherification wakhtiga la cayimay gudahood.
Xaaladaha dajinta: 950Kg ee methyl chloride iyo 303Kg ee propylene oxide.Ku dar wakiilka etherification oo qabooji oo walaaq ilaa 40 daqiiqo ka dibna kor u qaad heerkulka.Heerkulka ugu horreeya ee etherification waa 56 ° C, heerkulka joogtada ah waa 2.5h, heerkulka etherification labaad waa 87 ° C, heerkulka joogtada ah waa 2.5h.Dareen-celinta hydroxypropyl waxay ku socon kartaa qiyaastii 30 ° C, heerka falcelinta ayaa si weyn loo dardargeliyay 50 ° C, falcelinta methoxylation waa mid gaabis ah 60 ° C, oo daciif ah oo ka hooseeya 50 ° C.Qadarka, saamiga iyo wakhtiga methyl chloride iyo propylene oxide, iyo sidoo kale heerkulka kor u kaca ee habka etherification, waxay si toos ah u saameeyaan qaabka alaabta.
Qalabka muhiimka ah ee soo saarista HPMC waa reactor, qalajiyaha, granulator, pulverizer, iwm. Hadda, shirkado badan oo ajnabi ah ayaa isticmaala qalabka lagu soo saaro Jarmalka.Qalabka gudaha lagu soo saaro, hadday tahay awoodda wax-soo-saarka ama tayada wax-soo-saarka, ma dabooli karo baahida wax-soo-saarka HPMC ee tayada sare leh.
The All-In-One Reactor ee laga soo saaro Jarmalka waxay ku dhamaystiri kartaa tillaabooyin badan oo geeddi-socod ah oo leh hal qalab, xaqiijinta xakamaynta tooska ah, tayada badeecada deggan, iyo hawlaha wax-soo-saarka badbaadada iyo kalsoonida leh.
Qalabka ugu muhiimsan ee wax soo saarka HPMC waa suuf la safeeyey, sodium hydroxide, methyl chloride, iyo propylene oxide.
Waqtiga boostada: Nov-11-2021