Ụkpụrụ mmeghachi omume nke cellulose ether hydroxypropyl methyl cellulose: mmepụta nke HPMC hydroxypropyl methyl cellulose na-eji methyl chloride na propylene oxide dị ka etherification mmadụ.Usoro mmeghachi omume kemịkal bụ: Rcell-OH (owu a nụchara anụcha) + NaOH (sodium hydroxide), sodium hydroxide) + CspanCl (methyl chloride) + CH2OCHCspan (propylene oxide) → Rcell-O -CH2OHCspan (hydroxypropyl methylcellulose) ) + H2O (mmiri)
Usoro eruba:
Nchicha owu a nụchara anụcha—alkaliization—nri—alkalization—etherification— mgbake na ịsa ahụ—nkewa centrifugal—ihicha—ịchipịa—ịgwakọta —Nkwakọ ngwaahịa ngwaahịa.
1: Ngwa ngwa na ihe enyemaka maka mmepụta nke hydroxypropyl methylcellulose Isi ihe eji eme ihe bụ owu a nụchara anụcha, na ihe enyemaka bụ sodium hydroxide (sodium hydroxide), propylene oxide, methyl chloride, acetic acid, toluene, isopropanol, na nitrogen.Ebumnobi e ji gwepịa owu a nụchara anụcha bụ ibibi nhazi nke owu a nụchara anụcha site na ike igwe iji belata ogo kristal na polymerization na ịbawanye elu ya.
2: Nhazi na njikwa ihe eji eme ihe: N'okpuru nhazi nke ụfọdụ akụrụngwa, àgwà nke isi ihe ọ bụla na ihe inyeaka na oke nke ego agbakwunyere na ntinye nke ihe mgbaze na-emetụta kpọmkwem ihe ngosi dị iche iche nke ngwaahịa ahụ.Usoro usoro mmepụta ihe nwere mmiri ụfọdụ, na mmiri na ihe ndị na-emepụta ihe na-emepụta ihe na-adịghị agwụ agwụ, na mgbasa nke mmiri na-emetụta nkesa alkali na usoro.Ọ bụrụ na a kpalighị ya nke ọma, ọ ga-abụ ihe na-adịghị mma na alkalization otu na etherification nke cellulose.
3: Na-akpali akpali na nnyefe oke na nnyefe okpomọkụ: Cellulose alkalization na etherification na-eme ihe niile n'okpuru ọnọdụ dị iche iche (na-akpali site na ike mpụga).Ma dispersion na ibe kọntaktị nke mmiri, alkali, nụchara anụcha owu na etherifying gị n'ụlọnga na ihe mgbaze usoro bụ zuru ezu edo, ga-mmetụta alkalization na etherification mmetụta.Na-enweghị isi na-akpali akpali n'oge alkalization usoro ga-eme ka kristal alkali na mmiri ozuzo na ala nke akụrụngwa.Nleba elu oyi akwa dị ala na alkalization ezughị.N'ihi ya, a ka nwere nnukwu alkali n'efu na usoro ahụ mgbe etherification mechara.Ịdị n'otu, na-ebute nghọta na-adịghị mma, eriri ndị ọzọ na-akwụghị ụgwọ, njigide mmiri na-adịghị mma, ebe gel dị ala, na uru PH dị elu.
4: Usoro mmepụta (usoro mmepụta slurry)
(1:) Tinye kpọmkwem ego nke siri ike alkali (790Kg) na mmiri (mkpokọta usoro mmiri 460Kg) n'ime caustic soda kettle, bido na okpomọkụ na a mgbe nile okpomọkụ nke 80 degrees maka ihe karịrị 40 nkeji, na siri ike alkali bụ kpamkpam. agbazere.
(2:) Tinye 6500Kg nke ihe mgbaze na reactor (oke nke isopropanol na toluene na ihe mgbaze bụ ihe dịka 15/85);pịa alkali n'ime reactor, fesa 200Kg nke ihe mgbaze na tank alkali mgbe ịpịchara alkali.Ghichaa pipeline;A na-eme ka kettle mmeghachi omume dị jụụ ruo 23 Celsius, ma tinyekwa owu a nụchara anụcha (800Kg).Mgbe agbakwunyere owu a nụchara anụcha, a na-efesa 600Kg nke ihe mgbaze iji malite mmeghachi omume alkalization.A ghaghị imecha ihe mgbakwunye nke owu a nụchara anụcha n'ime oge a kapịrị ọnụ (nkeji 7) (ogologo oge mgbakwunye dị ezigbo mkpa).Ozugbo owu a nụchara anụcha batara na ngwọta alkali, mmeghachi omume alkalization na-amalite.Ọ bụrụ na oge nri dị ogologo, ogo alkalization ga-adị iche n'ihi oge mgbe owu a nụchara anụcha na-abanye na usoro mmeghachi omume, na-eme ka alkalization na-enweghị isi ma belata nha ngwaahịa.N'otu oge ahụ, ọ ga-eme ka cellulose alkali na-ejikọta na ikuku ruo ogologo oge iji oxidize na imebi, na-eme ka viscosity nke ngwaahịa na-ebelata.Iji nweta ngwaahịa nwere ọkwa viscosity dị iche iche, enwere ike itinye oghere na nitrogen n'oge usoro alkalization, ma ọ bụ tinye ụfọdụ antioxidant (dichloromethane).A na-achịkwa oge alkalization na 120min, ma debe okpomọkụ na 20-23 ℃.
(3:) Mgbe alkalisation gachara, gbakwunye onye na-ahụ maka etherifying a kapịrị ọnụ (methyl chloride na propylene oxide), bulie okpomọkụ na okpomọkụ a kapịrị ọnụ ma mee mmeghachi omume etherification n'ime oge a kapịrị ọnụ.
Ọnọdụ etherification: 950Kg nke methyl chloride na 303Kg nke propylene oxide.Tinye onye na-ahụ maka etherification ma dị jụụ ma kpalie maka nkeji 40 wee bulie okpomọkụ.Nke mbụ etherification okpomọkụ bụ 56 ° C, mgbe niile okpomọkụ oge bụ 2.5h, nke abụọ etherification okpomọkụ bụ 87 ° C, na mgbe niile okpomọkụ bụ 2.5h.Mmeghachi omume hydroxypropyl nwere ike ịga n'ihu n'ihe dị ka 30 Celsius C, mmeghachi omume mmeghachi omume na-abawanye na 50 Celsius C, mmeghachi omume methoxylation na-adị nwayọ na 60 Celsius C, na-esikwa ike n'okpuru 50 Celsius.Ọnụ ego, oke na oge nke methyl chloride na propylene oxide, yana njikwa ịrị elu okpomọkụ nke usoro etherification, na-emetụta kpọmkwem ihe nhazi ngwaahịa.
Ngwá ọrụ dị mkpa maka imepụta HPMC bụ reactor, dryer, granulator, pulverizer, wdg. Ugbu a, ọtụtụ ndị na-emepụta mba ọzọ na-eji akụrụngwa emepụtara na Germany.Ngwá ọrụ emepụtara n'ụlọ, ma ọ bụ ikike mmepụta ma ọ bụ n'ichepụta ihe, enweghị ike igbo mkpa nke mmepụta HPMC dị elu.
The All-In-One Reactor emepụtara na Germany nwere ike mezue multiple usoro nzọụkwụ na otu ngwaọrụ, ghọta akpaka akara, kwụsiri ike ngwaahịa àgwà, na nchekwa na ntụkwasị obi mmepụta arụmọrụ.
Ihe ndị bụ isi maka imepụta HPMC bụ owu a nụchara anụcha, sodium hydroxide, methyl chloride, na propylene oxide.
Oge nzipu: Nov-11-2021